WO2022068251A1 - 呼叫方法、装置及系统 - Google Patents

呼叫方法、装置及系统 Download PDF

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Publication number
WO2022068251A1
WO2022068251A1 PCT/CN2021/098677 CN2021098677W WO2022068251A1 WO 2022068251 A1 WO2022068251 A1 WO 2022068251A1 CN 2021098677 W CN2021098677 W CN 2021098677W WO 2022068251 A1 WO2022068251 A1 WO 2022068251A1
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WO
WIPO (PCT)
Prior art keywords
call
user equipment
indication information
roaming
communication message
Prior art date
Application number
PCT/CN2021/098677
Other languages
English (en)
French (fr)
Inventor
常丽娟
孟斌
张园园
郝红霞
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP21873913.4A priority Critical patent/EP4207825A4/en
Publication of WO2022068251A1 publication Critical patent/WO2022068251A1/zh
Priority to US18/193,466 priority patent/US20230308490A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1033—Signalling gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1045—Proxies, e.g. for session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1046—Call controllers; Call servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1063—Application servers providing network services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular, to a calling method, device, and system.
  • IP multimedia subsystem IP multimedia subsystem
  • user equipment may move from its home area to another area, which may be called a roaming area.
  • IP multimedia subsystem IP multimedia subsystem, IMS
  • the session control function device that receives the relevant call message in the roaming area must route the call message to the home area of the user equipment to trigger the application server (application server, AS) in the home area to provide call value-added services for the user equipment services, such as CRBT service, advertising video service, short message service, etc., and then route the call message to the called user equipment.
  • application server application server, AS
  • the embodiments of the present application provide a calling method, device, and system, so as to solve the problem that the end-to-end delay between a user equipment roaming outside the home area and the AS of the user equipment's home area is relatively large, and the network resource utilization of the AS lower problem.
  • an embodiment of the present application provides a calling method.
  • the calling method is applied to a CSCF device with a first call session control function.
  • the method includes: receiving a first communication message including a first call signaling, and the first call signaling
  • the originator or receiver is the roaming user equipment of the first CSCF device, and based on the first communication message, the first call signaling is routed to the roaming place AS of the roaming user equipment, where the roaming place AS is the first CSCF device
  • the AS that has the capability of providing call value-added services for user equipment in the home area of the roaming site enables the roaming AS to provide call value-added services for intruding user equipment.
  • the call signaling is routed to the roaming AS of the roaming user equipment
  • the roaming AS of the user equipment provides call value-added services for the roaming user equipment. Since the user equipment that roams outside the home area of the user equipment is relatively close to its roaming place AS, the roaming place AS of the inbound user equipment provides call value-added services for the user equipment, and the roaming between the inbound user equipment and the inbound user equipment The distance between the local AS is relatively short, and the end-to-end delay between the inbound user equipment and the roaming local AS of the inbound user equipment is low, which improves the user experience.
  • the application server can not only provide call value-added services for the local calling party, but also provide call value-added services for the inbound user equipment roaming to the home area, adding AS to the calling party Opportunities to provide services and improve network resource utilization.
  • routing the first call signaling to the roaming application server AS of the roaming user equipment based on the first communication message includes: determining the originator or receiver of the first call signaling based on the first communication message.
  • the party is the roaming user equipment of the first CSCF device, and in response to the first communication message, causes the first call signaling to be routed to the roaming AS.
  • call signaling can be routed to the roaming AS, triggering the roaming AS to provide call value-added services for the roaming user equipment. Due to the short distance between the user equipment and the roaming AS, the user equipment and the roaming AS are relatively close to each other. The end-to-end delay between roaming ASs is low, which can improve user experience and improve AS network resource utilization.
  • routing the first call signaling to the roaming AS includes: sending a second communication message to the second CSCF device or the roaming AS in the home area of the first CSCF device, the second communication message It includes the first call signaling and the first indication information, where the first indication information indicates that the originator or the receiver of the first call signaling is a flood-in user equipment of the first CSCF device.
  • the first CSCF device can directly send the second communication message to the roaming AS, or can send the second communication message to the roaming AS through the second CSCF device, effectively and flexibly designing the sending of the second communication message way, while simplifying the system design.
  • the first indication information further indicates that the first call signaling or the second call signaling of the call service corresponding to the first call signaling is routed to the roaming AS of the roaming user equipment.
  • the first indication information is given the function of instructing to route the call signaling to the roaming AS, and the devices on the call signaling transmission route route the call signaling to the roaming AS according to the first indication information, simplifying the system design.
  • the method further includes: storing the first indication information corresponding to the call service or communication session corresponding to the first call signaling.
  • the call service or communication session corresponding to the first indication information and the first call signaling can be stored correspondingly, so that after the device on the call signaling transmission route receives the call signaling again, according to the corresponding relationship
  • the first indication information routes the call signaling to the roaming AS according to the call route designed in the embodiment of the present application, and triggers the roaming AS to provide the call value-added service.
  • the second communication message further includes address information of the second CSCF device, so that the second communication message is routed to the second CSCF device.
  • the communication message carrying the call signaling can be routed to the roaming AS through the second CSCF device according to the address information of the second CSCF device, thereby simplifying the system design.
  • determining, based on the first communication message, that the originator or the receiver of the first call signaling is a flood-in user equipment of the first CSCF device including: based on a from (from) header field in the first communication message or the PAI header field, to determine that the initiator of the first call signaling is the inbound user equipment of the first CSCF device; or, based on the to header field in the first communication message, determine that the receiver of the first call signaling is the first Flood-in user equipment of CSCF devices.
  • the initiator or the receiver of the call signaling is the inbound user equipment according to the information carried in the header field of the communication message, which simplifies the system design.
  • the method further includes: receiving a third communication message sent by the roaming AS, where the third communication message includes the first call signaling, the first indication information and the second indication information, and the second indication information uses It is used to indicate that the roaming AS will provide call value-added services for the intruding user equipment; or, the second indication information is used to indicate that the roaming AS has provided call value-added services for the intruding user equipment;
  • the CSCF device sends a fourth communication message, where the fourth communication message includes the first call signaling, the first indication information and the second indication information.
  • the communication message sent by the roaming AS can be routed to the home area of the user equipment, for example, to the home AS in the home area, so that the home AS can perform services according to the content carried in the communication message.
  • Conflict handling is performed to avoid the problem of service conflict caused by both the home AS and the roaming AS providing call value-added services for the intruding user equipment.
  • the method further includes: receiving a fifth communication message from a third CSCF device infiltrating into the home area of the user equipment, where the fifth communication message includes the first indication information and the third indication information, and the three indications The information is used to indicate that the home AS of the roaming user equipment will provide call value-added services for the roaming user equipment; according to the first indication information, send a sixth communication message to the roaming AS, and the sixth message includes the first indication information and the third Instructions.
  • the communication message sent by the home AS can be routed back to the roaming AS in the roaming area of the user equipment, so that the roaming AS performs service conflict processing according to the content carried in the communication message to avoid home
  • the local AS and the roaming local AS provide the inbound user equipment with the problem of service conflict brought about by calling value-added services.
  • the method further includes: receiving a fifth communication message from a third CSCF device infiltrating the home area of the user equipment, where the fifth communication message includes the first indication information and the second indication information; Sending a sixth communication message to the roaming AS with indication information, where the sixth message includes the first indication information and the second indication information.
  • the communication message sent by the home AS can be routed back to the roaming AS in the roaming area of the user equipment, so that the roaming AS performs service conflict processing and avoids the home AS and the roaming AS being simultaneously
  • the method before routing the first call signaling to the roaming AS based on the first communication message, the method further includes: determining that the roaming user equipment has an AS in the home area that uses the first CSCF device Provides the ability to call value-added services.
  • the call signaling outside the roaming AS to determine whether the inbound user equipment supports the capability of using the value-added call service provided by the AS in the home area of the first CSCF device.
  • the call signaling can be roamed to the AS only if it is capable of roaming, triggering the roaming AS to provide the call value-added service, avoiding the problem that the call value-added service cannot be presented because the user equipment does not have the ability to support the call value-added service provided by the roaming AS. .
  • the second CSCF device in the home area of the first CSCF device is an inquiry-call session function I-CSCF device or a service-call session control function S-CSCF device in the home area of the first CSCF device .
  • the first CSCF device is a Proxy-Call Session Control Function P-CSCF device.
  • a device for implementing the calling method of the embodiment of the present application is designed effectively and flexibly.
  • an embodiment of the present application provides a calling method, which is applied to a second call session control function CSCF device.
  • the method includes: receiving a second communication message from the first call session control function CSCF device, and the second communication
  • the message includes the first call signaling, and the originator or the receiver of the first call signaling is the roaming user equipment of the first CSCF device; the first call signaling is routed to the roaming user equipment of the roaming user equipment based on the second communication message
  • the local application server AS, and the roaming AS is an AS in the home area of the first CSCF device that has the capability of providing call value-added services for the user equipment.
  • the call signaling is routed to the roaming AS of the roaming user equipment, and the roaming AS of the roaming user equipment provides call value-added services for the roaming user equipment. Since the user equipment roaming outside the home area of the user equipment is relatively close to the roaming place AS, the roaming place AS that roams into the user equipment provides the user equipment with call value-added services. Due to the distance between the user equipment and the roaming place AS Closer, the end-to-end delay between the user equipment and its roaming AS is low, which can improve user experience.
  • the application server can not only provide call value-added services for the local calling party, but also provide call value-added services for the inbound user equipment roaming to the home area, which increases the opportunities for the AS to provide services for the calling party and improves the utilization of network resources. .
  • the second communication message further includes first indication information, where the first indication information is used to indicate that the originator or the receiver of the first call signaling is the intruder user equipment of the first CSCF device; based on the second The communication message causes the first call signaling to be routed to the roaming location application server AS of the roaming user equipment, including: sending a second communication message to the roaming location AS according to the first indication information.
  • the first indication information further indicates that the first call signaling or the second call signaling of the call service corresponding to the first call signaling is routed to the roaming AS of the roaming user equipment.
  • the method further includes: storing the first indication information corresponding to the call service or communication session corresponding to the first call signaling.
  • the second communication message further includes address information of the second CSCF device, so that the second communication message is routed to the second CSCF device.
  • the method further includes: receiving a third communication message sent by the roaming AS, where the third communication message includes the first call signaling, the first indication information and the second indication information, and the second indication information uses It is used to indicate that the roaming AS will provide call value-added services for the intruding user equipment, or the second indication information is used to indicate that the roaming AS has provided call value-added services for the intruding user equipment;
  • the three CSCF devices send a fourth communication message, where the fourth communication message includes the first call signaling, the first indication information, and the second indication information.
  • the method further includes: receiving a fifth communication message from a third CSCF device infiltrating into the home area of the user equipment, where the fifth communication message includes the first indication information and the third indication information, and the three indications The information is used to indicate that the home AS of the roaming user equipment will provide call value-added services for the roaming user equipment; according to the first indication information, send a sixth communication message to the roaming AS, and the sixth message includes the first indication information and the third Instructions.
  • the method further includes: receiving a fifth communication message from a third CSCF device infiltrating into the home area of the user equipment, where the fifth communication message includes the first indication information and the second indication information, according to the first indication information. Sending a sixth communication message to the roaming AS with indication information, where the sixth message includes the first indication information and the second indication information.
  • the second CSCF device is an inquiry-call session function I-CSCF device in the home area of the first CSCF device or a service-call session control function S-CSCF device in the home area of the second CSCF device .
  • the first indication information For the related descriptions of the first indication information, the second communication message, and the second CSCF device, reference may be made to the description in the first aspect or the possible designs of the first aspect, and details are not repeated.
  • an embodiment of the present application provides a call method, which is applied to a first AS.
  • the method includes: receiving a second communication message from a first call session control function CSCF device or a second CSCF device; a second communication message
  • the message includes the first call signaling, and the originator or the receiver of the first call signaling is the inbound user equipment of the first CSCF device or the second CSCF device; based on the second communication message, the inbound user equipment is provided with call value-added services.
  • a call value-added service is provided for the inbound user equipment by the roaming site AS of the inbound user equipment. Since the user equipment roaming outside the home area of the user equipment is relatively close to its roaming AS, the roaming AS that roams into the user equipment provides call value-added services for the user equipment. The distance between the inbound user equipment and the roaming AS is relatively short, and the end-to-end delay between the roaming user equipment and the roaming AS is low, which can improve the user experience.
  • the application server can not only provide call value-added services for the local calling party, but also provide call value-added services for the inbound user equipment roaming to the home area, adding AS to the calling party Opportunities to provide services and improve network resource utilization.
  • the second communication message further includes first indication information, where the first indication information is used to indicate that the originator or receiver of the first call signaling is a flood-in user equipment of the first CSCF device.
  • the first indication information further indicates that the first call signaling or the second call signaling of the call service corresponding to the first call signaling is routed to the first AS.
  • the method further includes: storing the first indication information corresponding to the call service or communication session corresponding to the first call signaling.
  • providing a value-added call service for the intruding user equipment based on the second communication message includes: in response to the second communication message, providing a value-added call service for the intruding user equipment; sending a third communication to the second CSCF device message, the third communication message includes the first call signaling, the first indication information and the second indication information, the second indication information indicates that the first AS has provided the call value-added service for the intruding user equipment.
  • flooding into the user equipment based on the second communication message to provide the call value-added service includes: in response to the second communication message, sending a third communication message to the second CSCF device, where the third communication message includes the first call information. command, first indication information and second indication information, the second indication information indicates that the first AS will provide the call value-added service for the intruding user equipment; receive a sixth communication message from the second CSCF device, the sixth communication message contains the first call signaling, the first indication information, and the third indication information, the third indication information indicates that the home AS of the intruding user equipment will provide call value-added services for the intruding user equipment; in response to the sixth communication message, providing the intruding user equipment with Call value-added services.
  • the description of the first indication information, the second communication message, the second CSCF device, the third communication message, the fourth communication message, the fifth communication message, and the sixth communication message may refer to the first aspect or the possibility of the first aspect It is described in the design of , and will not be repeated.
  • an embodiment of the present application provides a call method, applied to a second AS, the method includes: receiving a seventh communication message from a third call session control function CSCF device; the seventh communication message includes the first call signaling, the initiator or receiver of the first call signaling is the home user equipment of the third CSCF device; based on the seventh communication message, the first call signaling or the second call signaling of the call service corresponding to the first call signaling Let be routed to the first AS, where the first AS is the AS of the roaming area of the home user equipment.
  • the home AS routes the call signaling to the roaming AS, and the roaming AS provides call value-added services for the roaming user equipment. Since the user equipment roaming outside the home area of the user equipment is relatively close to its roaming AS, the roaming AS that roams into the user equipment provides call value-added services for the user equipment. The distance between the inbound user equipment and the roaming AS is relatively short, and the end-to-end delay between the roaming user equipment and the roaming AS is low, which improves the user experience.
  • the application server can not only provide call value-added services for the local calling party, but also provide call value-added services for the inbound user equipment roaming to the home area, adding AS to the calling party Opportunities to provide services and improve network resource utilization.
  • the seventh communication message further includes first indication information, where the first indication information is used to indicate that the originator or receiver of the first call signaling is the intrusion user equipment of the first CSCF device, and the first CSCF The device is a CSCF device in the roaming area of the home user equipment.
  • the first indication information further indicates that the first call signaling or the second call signaling of the call service corresponding to the first call signaling is routed to the roaming AS of the home user equipment.
  • the method further includes: storing the first indication information corresponding to the call service or communication session corresponding to the first call signaling.
  • routing the first call signaling to the first AS based on the seventh communication message includes: in response to the seventh communication message, sending an eighth communication message to the third CSCF device, including the first call signaling. command, first indication information, and third indication information, where the third indication information indicates that the second AS will provide call value-added services for the intruding user equipment.
  • routing the first call signaling to the first AS based on the seventh communication message includes: in response to the seventh communication message, sending an eighth communication message to the third CSCF device, including the first call signaling. command, the first instruction information.
  • the present application provides a communication device.
  • the communication device may be a functional module or physical entity that implements the first aspect or any possible design of the first aspect, or implements the second aspect or the second aspect.
  • the communication device may be implemented by hardware, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication device may include modules or means (means) corresponding to one-to-one execution of the methods/operations/steps/actions described in the first aspect, and the modules, units, or means may be implemented by hardware,
  • the software is implemented, or the corresponding software is implemented by hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the communication apparatus may include: a receiving unit and a processing unit.
  • the communication device may be a functional module or physical entity that implements the first aspect or any possible design of the first aspect
  • the receiving unit is configured to receive the first call signaling including the first call signaling.
  • the originator or the receiver of the first call signaling is the flood-in user equipment of the first CSCF device.
  • the processing unit is configured to route the first call signaling to the roaming place AS of the roaming user equipment based on the first communication message, where the roaming place AS is capable of providing call value-added services for the user equipment in the home area of the first CSCF device; capable AS, so that the roaming AS provides call value-added services for the inbound user equipment.
  • the communication apparatus For the specific implementation of the communication apparatus, reference may be made to the behavior function of the first CSCF device in the calling method provided by the first aspect or any possible design of the first aspect, and details are not repeated here. Therefore, the provided communication device can achieve the same beneficial effects as the first aspect or any possible design of the first aspect.
  • the communication device may be a functional module or physical entity that implements the second aspect or any possible design of the second aspect, and the receiving unit is configured to receive the CSCF device from the first call session control function.
  • the second communication message includes the first call signaling, and the initiator or the receiver of the first call signaling is the inbound user equipment of the first CSCF device;
  • the processing unit is configured to make the user equipment based on the second communication message
  • the first call signaling is routed to the roaming application server AS that roams into the user equipment, and the roaming AS is an AS capable of providing call value-added services for the user equipment in the home area of the first CSCF device.
  • the communication apparatus For the specific implementation of the communication apparatus, reference may be made to the behavior function of the second CSCF device in the calling method provided in the second aspect or any possible design of the second aspect, and details are not repeated here. Therefore, the provided communication device can achieve the same beneficial effects as the second aspect or any possible design of the second aspect.
  • the communication device may be a functional module or a physical entity that implements the third aspect or any possible design of the third aspect
  • the receiving unit is configured to receive a call from the first call session control function CSCF device Or the second communication message of the second CSCF device; the second communication message includes the first call signaling, and the originator or the receiver of the first call signaling is the flood-in user equipment of the first CSCF device or the second CSCF device; processing The unit is configured to provide a call value-added service for the intruding user equipment based on the second communication message.
  • the communication apparatus For the specific implementation of the communication apparatus, reference may be made to the behavior function of the first AS in the calling method provided by the third aspect or any possible design of the third aspect, and details are not repeated here. Therefore, the provided communication device can achieve the same beneficial effects as the third aspect or any possible design of the third aspect.
  • the communication device may be a functional module or physical entity that implements the fourth aspect or any possible design of the fourth aspect
  • the receiving unit is configured to receive a call from the third call session control function CSCF device the seventh communication message;
  • the seventh communication message includes the first call signaling, and the initiator or the receiver of the first call signaling is the home user equipment of the third CSCF device;
  • the processing unit is configured to make the first call signaling based on the seventh communication message
  • a call signaling or a second call signaling of a call service corresponding to the first call signaling is routed to the first AS, where the first AS is the AS in the roaming area of the home user equipment.
  • the communication apparatus For the specific implementation of the communication apparatus, reference may be made to the behavior function of the second AS in the calling method provided by the fourth aspect or any possible design of the fourth aspect, and details are not repeated here. Therefore, the provided communication device can achieve the same beneficial effects as the fourth aspect or any possible design of the fourth aspect.
  • a communication apparatus may be a first CSCF device or a chip or a system-on-chip in the first CSCF device, or other modules or units capable of implementing the first CSCF device-side method.
  • the communication apparatus may implement the functions performed by the first CSCF device in the first aspect or each possible design, and the functions may be implemented by hardware.
  • the communication device may include: a processor and a communication interface, where the processor is configured to receive a first communication message including the first call signaling through the communication interface, and the initiator or the receiver of the first call signaling is:
  • the roaming user equipment of the first CSCF device causes the first call signaling to be routed to the roaming place AS of the roaming user equipment based on the first communication message, where the roaming place AS is the user equipment in the home area of the first CSCF device.
  • the AS that provides the capability of calling value-added services, so that the roaming AS provides the value-added services for intruding user equipment.
  • the communication device described in the sixth aspect may be a second CSCF device or a chip or a system-on-chip in the second CSCF device, or may be used in the second CSCF device to implement the methods described in the embodiments of the present application.
  • the modules or units of the calling method described above, or other modules or units capable of implementing the method executed by the second CSCF device, for example, the communication apparatus may include: a processor and a communication interface.
  • the processor and the communication interface included in the communication apparatus are used to support the communication apparatus to implement the functions performed by the second CSCF device in the second aspect or each possible design of the second aspect.
  • the communication device described in the sixth aspect may be a chip or a system-on-chip in the first AS or the first AS, and may also be used in the first AS to implement the call described in the embodiments of the present application.
  • the modules or units of the method, or other modules or units capable of implementing the method executed by the first AS, for example, the communication apparatus may include: a processor and a communication interface.
  • the processor and the communication interface included in the communication device are used to support the communication device to implement the third aspect or the functions performed by the first AS in each possible design of the third aspect, or to implement the third aspect or the third aspect.
  • the communication device described in the sixth aspect may be a second AS or a chip or a system-on-chip in the second AS, and may also be used in the second AS to implement the call described in the embodiments of the present application.
  • the modules or units of the method, or other modules or units capable of implementing the method executed by the second AS, for example, the communication apparatus may include: a processor and a communication interface.
  • the processor and the communication interface included in the communication device are used to support the communication device to implement the functions performed by the second AS in the fourth aspect or each possible design of the fourth aspect, or to implement the fourth aspect or the fourth aspect.
  • the communication apparatus of the sixth aspect may further include a memory for storing computer instructions and/or data.
  • the processor executes the computer instructions stored in the memory, so that the communication apparatus executes the calling method described in the first aspect or any possible design of the first aspect; or, executes the above The calling method described in the second aspect or any possible design of the second aspect; or, executing the calling method described in the third aspect or any possible design of the third aspect; or, executing the fourth aspect above or the calling method described in any possible design of the fourth aspect.
  • the communication interface may be a transceiver, an interface circuit, a bus interface, a pin, or other devices capable of implementing a transceiver function.
  • a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, so that when the computer-readable storage medium runs on a computer, the computer can execute the above-mentioned first aspect or any possible design of the above-mentioned aspect.
  • the calling method or, executing the calling method described in the second aspect or any possible design of the second aspect; or, executing the third aspect or any possible design of the third aspect.
  • a computer program product containing instructions
  • the computer program product can include program instructions, when the computer program product is run on a computer, the computer can execute the above-mentioned first aspect or any possibility of the above-mentioned aspect. or, execute the calling method described in the second aspect or any possible design of the second aspect; or, execute the third aspect or any possible design of the third aspect.
  • a ninth aspect provides a system-on-chip, the system-on-chip includes a processor and a communication interface, and the system-on-chip can be used to implement the first CSCF device in the first aspect or any possible design of the first aspect.
  • function, or the system-on-a-chip can implement the functions performed by the second CSCF device in the second aspect or each possible design of the second aspect, or, implement the third aspect or the third aspect in each possible design of the third aspect.
  • an embodiment of the present application further provides a communication system, where the communication system includes the communication device according to the fifth aspect or the sixth aspect.
  • FIG. 1a is a schematic diagram 1 of a roaming user accessing an IMS network in a home area
  • Figure 1b is a schematic diagram 2 of a roaming user accessing an IMS network in a home area
  • FIG. 2 is a schematic diagram of a roaming user using a home area to call a value-added service
  • FIG. 3 is a schematic diagram of a communication network architecture provided by an embodiment of the present application.
  • FIG. 4 is a flowchart 1 of a calling method provided by an embodiment of the present application.
  • FIG. 5 is a second flowchart of a calling method provided by an embodiment of the present application.
  • FIG. 6 is a flowchart of a calling party using a call value-added service in a roaming area in an embodiment of the present application
  • FIG. 7 is a flowchart of the call value-added service of the called party using the roaming area in the embodiment of the present application.
  • FIG. 8 is a third flowchart of a calling method provided by an embodiment of the present application.
  • FIG. 9 is a fourth flowchart of a calling method provided by an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of an apparatus 100 provided by an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of an apparatus 110 provided by an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of an apparatus 120 provided by an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of an apparatus 130 provided by an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of an apparatus 140 provided by an embodiment of the present application.
  • the IMS network is a network architecture that provides voice and multimedia services based on an Internet Protocol (IP) network, which can meet the needs of current terminal customers for more novel and diversified multimedia services.
  • IP Internet Protocol
  • the IMS network has the following characteristics: It adopts the session initiation protocol (SIP) as the call control protocol, realizes the separation of call control and service control based on SIP, and enhances the multimedia support capability; The same service as the home area can also be used in other places.
  • SIP session initiation protocol
  • Roaming refers to the movement of a user equipment from its own registration area/home area to another area other than the registration area/home area.
  • the network area outside the registration area/home area of the user equipment may be called the roaming area or the visited area or the roaming area or the visited area of the user equipment, and the communication network therein is called the visited public land mobile network (PLMN) (referred to as VPLMN).
  • PLMN visited public land mobile network
  • the home area of the user equipment may be referred to as the home area
  • the communication network of the home area of the user equipment may be referred to as the home public land mobile network (HPLMN) of the user equipment (HPLMN for short).
  • HPLMN home public land mobile network
  • the user equipment in the roaming area can access the IMS network in the home area of the user equipment through the method shown in FIG. 1a or the method shown in FIG. 1b, and use the call value-added service provided by the IMS network in the home area.
  • the roaming area provides a data channel including a data gateway and a border gateway (BG), and the user equipment can pass through the data channel and the data gateway of the home area (such as a packet data network (packet data network, PDN) gateway (PDN gateway, P-GW)) intercommunication, access the IMS network of the home area through the data gateway of the home area, and use the call value-added services in the home area.
  • BG border gateway
  • the proxy-call session control function (proxy-call session control function, P-CSCF) device in the roaming area is intercommunicated with the IMS network in the home area, and the user equipment can access the user through the P-CSCF device in the roaming area.
  • the home area of the device using the call value-added services in the home area.
  • the user equipment initiates a call request in its roaming area, but the sent call request can be routed to the IMS network in the home area of the user equipment in the manner shown in FIG. 1a or FIG.
  • the IMS network in the roaming area provides call value-added services for user equipment, and it cannot be implemented that the IMS in the roaming area provides call value-added services for the intruding user equipment. For example, as shown in FIG. 1a or FIG.
  • the P-CSCF device in the roaming area routes the invite message to the home area of UE1
  • the I-CSCF device/S-CSCF device of UE1's home area routes the invite message to the IMS network of UE1's home area by the I-CSCF device/S-CSCF device of UE1's home area, triggering the AS of UE1's home area to provide UE1 with The value-added service is called, and at the same time, the invite message is further routed to UE2 for call connection.
  • the user equipment UE1 roaming outside the home area can only use the call value-added service provided by the home application server (application servicer, AS) of the UE1. Since the UE1 roaming outside the home area is far away from the home AS of the UE1, the end-to-end delay between the UE1 and the home AS is relatively large, which reduces the user experience.
  • the home AS of UE1 can only provide call value-added services for the local UE, but cannot provide call value-added services for the inbound UEs roaming into the home area, reducing the number of AS services for the UE. opportunities to reduce network resource utilization.
  • an embodiment of the present application provides a calling method, including: a first CSCF device receiving a first communication message including a first call signaling, and the originator or calling party of the first call signaling is the first The inbound user equipment of the CSCF device, the first CSCF device causes the first call signaling to be routed to the roaming location AS of the inbound user equipment based on the first communication message, and the roaming location AS is in the home area of the first CSCF device with the User equipment provides the AS with the ability to call value-added services.
  • the roaming site AS of the roaming user equipment can provide call value-added services for the roaming user equipment, so that the roaming user equipment can use the call value-added services in the roaming area. Since the user equipment roaming outside the home area is relatively close to the roaming place AS in the roaming area of the user equipment, the roaming place AS in the roaming area of the user equipment provides call value-added services for the user equipment. The distance between the roaming ASs is short, and the end-to-end delay between the user equipment and the roaming ASs is low, which can improve user experience.
  • the application server can not only provide the value-added call service for the local user equipment, but also provide the value-added call service for the inbound user equipment roaming to the home area, and increase the AS to provide services for the user equipment opportunities to improve network resource utilization.
  • the roaming user equipment may be a user equipment that roams from the home area of the user equipment (such as HPLMN) to an area outside the home area of the user equipment (such as another PLMN) .
  • the area outside the home area may be referred to as the roaming area or visited area or HPLMN or roaming area of the user equipment.
  • the user equipment may be referred to as a flood-in user equipment of devices in areas other than the home area, and from the perspective of devices in the home area of the user equipment (such as HPLMN), the user equipment may be This is referred to as "diffusing" the user device.
  • the home area of UE1 is area 1
  • area 2 is different from area 1
  • area 1 can be called UE1's home area
  • area 2 can be called UE1's home area.
  • a roaming area or a roaming place or a visited place, from the perspective of the P-CSCF in the area 2, the UE1 may be referred to as a roaming user equipment of the P-CSCF device.
  • the roaming AS may refer to an AS that roams into the roaming area of the user equipment
  • the home AS may refer to an AS that swarms into the home area of the user equipment.
  • the value-added call service refers to in the context of the call service (including before a call, during a call, or after a call), from an application server to the user equipment (which can be the caller, the caller, the user equipment) participating in the call service
  • the supplementary service can be used by a call service application (Application, APP, such as a telephony application, telephony APP) on the user equipment or Consumption can also be used or consumed by applications (such as plug-in applications, nested applications, etc.) associated with the call service application of the user equipment
  • the supplementary services may include but are not limited to media services and message services; If the supplementary service is a media service, the application server may trigger the call service application on the user equipment to present media content based on call signaling, where the media content may be game content, CRBT content, and caller ID content. If the supplementary service is
  • the format of the media content may include, but is not limited to, video content, audio content, hypertext markup language (HTML) pages, joint photographic experts group (JPEG) pictures, images Interactive format (graphics interchange format, GIF) animation.
  • the format is audio content
  • the above-mentioned presentation of the media content refers to playing the audio content on the user equipment;
  • the format is video content, HTML pages, JPEG pictures, GIF animations, etc.
  • the above-mentioned presentation of the media content refers to rendering on the user equipment (render) Or display video content, HTML pages, JPEG pictures, GIF animations, etc.
  • the call service may refer to the voice call service or video call service performed by the user equipment as the calling identity or the called identity, and connecting with other calling equipment (such as the called party) through the communication network, for example , the call service may be the voice call service or video service performed by the user equipment to dial the mobile phone number, office landline number or customer service center number.
  • the call service may be the voice call service performed by the user equipment to receive calls from the mobile phone, office landline or customer service center. Call service or video service.
  • the AS can trigger UE1 to present media content, game content, etc. on the APP interface related to the call service when the call request arrives at the stage of UE2-UE2 ringing-UE2 off-hook, and can also be off-hook at UE2-UE1 and UE2
  • the AS triggers the UE1 to provide media content, game content, etc. on the APP interface related to the call service.
  • the network architecture may include: user equipment (user equipment, UE), multiple IMS networks, and multiple IMS networks may Including the IMS network registered by the user equipment, each IMS network may include a P-CSCF device, an interrogating-call session control function (interrogating-call session control function, I-CSCF) device, a serving-call session control function (serving-call session control function) control function, S-CSCF) equipment, and AS, may also include access network equipment, session border controller (session border controller, SBC) and home subscriber server (home subscriber, HSS) and other equipment, without limitation.
  • I-CSCF interrogating-call session control function
  • S-CSCF serving-call session control function
  • AS may also include access network equipment, session border controller (session border controller, SBC) and home subscriber server (home subscriber, HSS) and other equipment, without limitation.
  • SBC session border controller
  • HSS home subscriber server
  • IMS network 3 includes multiple UEs such as UE1, UE2, and UE3, an access network device 10, an SBC11, a P-CSCF device 12, an access network device 20, a P-CSCF device 21, an SBC31, and an IMS network.
  • IMS network 2 and IMS network 3 IMS network 1 includes I-CSCF equipment 13, S-CSCF equipment 14 and AS 15, IMS network 2 includes I-CSCF equipment 22, S-CSCF equipment 23 and AS 24, IMS network 3 includes I-CSCF device 33, S-CSCF device 34, and AS35.
  • the calling method provided in the embodiments of the present application can be applied to various communication scenarios, for example, can be applied to one or more of the following communication scenarios: enhanced mobile broadband (enhanced mobile broadband, eMBB), ultra-reliable and low-latency communication (ultra-reliable and low-latency communication) reliable low latency communication (URLLC), machine type communication (MTC), massive machine type communication (mMTC), device to device (D2D), vehicle to everything, V2X), vehicle-to-vehicle (V2V), and Internet of things (IoT), etc.
  • enhanced mobile broadband enhanced mobile broadband
  • eMBB enhanced mobile broadband
  • ultra-reliable and low-latency communication ultra-reliable and low-latency communication
  • reliable low latency communication URLLC
  • MTC machine type communication
  • mMTC massive machine type communication
  • D2D device to device
  • V2X vehicle to everything
  • V2X vehicle-to-vehicle
  • IoT Internet of things
  • the P-CSCF device, the I-CSCF device, and the S-CSCF device in the IMS network may be regarded as different types of SIP proxies or servers.
  • the P-CSCF equipment, I-CSCF equipment and S-CSCF equipment can be independently deployed in the IMS network as shown in Figure 3, or the P-CSCF equipment, I-CSCF equipment and S-CSCF equipment can be deployed together. Deploy independent I-CSCF equipment and S-CSCF equipment, but integrate the functions of I-CSCF equipment and S-CSCF equipment into P-CSCF, so that P-CSCF equipment has I-CSCF equipment and S-CSCF equipment function.
  • User equipment may be a terminal (terminal, MT), a mobile station (mobile station, MS), or a mobile terminal (mobile terminal, MT), etc.
  • the user equipment may be a mobile phone (mobile phone), a tablet computer (tablet) or a computer with a wireless transceiver function, and may also be a virtual reality (virtual reality, VR) terminal, an augmented reality (augmented reality, AR) terminal, industrial Wireless terminal in control, wireless terminal in unmanned driving, wireless terminal in telemedicine, wireless terminal in smart grid, wireless terminal in smart city, smart home, or vehicle-mounted terminal, etc.
  • the user equipment may first connect to the access network equipment, and then access the IMS network through a packet data serving node (PDSN).
  • PDSN packet data serving node
  • the access network equipment is mainly used to provide network services for the user equipment to access the IMS network, and to implement at least one function of resource scheduling, radio resource management, radio access control and at least one of the functions of the user equipment.
  • the access network equipment may include any node among a base station, a wireless access point, a transmission receive point (TRP), a transmission point (TP), and some other access nodes.
  • the P-CSCF device is the entry point for the user equipment to access the IMS network, and is responsible for interacting with the user equipment. Mainly used to generate call detail record (CDR) bills, user roaming billing requirements, provide SIP compression and integrity protection on the Gm interface, and route user equipment requests to the correct I-CSCF device/S - CSCF equipment.
  • CDR call detail record
  • the I-CSCF equipment is mainly used to allocate the S-CSCF equipment that provides services to the user equipment when the user equipment is registered, and select the S-CSCF equipment registered by the called party for incoming calls.
  • the S-CSCF device implements user equipment registration and authentication, service triggering and control, and session routing.
  • AS responsible for processing specific services, such as providing call value-added services for user equipment.
  • the SBC is a network element at the edge of the IMS network for implementing IP access, interworking and security protection. It exists between the access network and the IMS network or between different IMS networks, and is the entry point for users to access the IMS.
  • HSS is the main data store for all user and service related data in IMS.
  • the data stored in the HSS mainly includes user identity, registration information, access parameters and service trigger information, user equipment identification information, user security context, key information for user network access authentication, and roaming restriction information.
  • FIG. 3 is only an exemplary architecture diagram, in addition to the functional units shown in FIG. 3 , the system may also include other functional network elements, such as a domain name system (domain name system, DNS) server and the like. This embodiment of the present application does not limit this.
  • the names of each device in FIG. 3 are not limited.
  • each device can also be named with other names, such as replacing the names of network elements with the same or similar functions, which are not limited.
  • the P-CSCF device, the I-CSCF device, the S-CSCF device, etc. in the embodiments of the present application may also be referred to as communication devices, which may be a desktop computer, a portable computer, a network server, a mobile phone, a tablet.
  • Communication devices may be a desktop computer, a portable computer, a network server, a mobile phone, a tablet.
  • Computers, wireless terminals, embedded devices, chip systems, etc. are not specifically limited in this embodiment of the present application.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the related functions of the P-CSCF device, the I-CSCF device, and the S-CSCF device in the embodiments of the present application may be implemented by one device, may be implemented jointly by multiple devices, or may be implemented by a device within one device.
  • One or more functional modules are implemented, which is not specifically limited in this embodiment of the present application. It can be understood that the above functions may be network elements in hardware devices, software functions running on dedicated hardware, or a combination of hardware and software, or a virtualized virtual machine instantiated on a platform (such as a cloud platform). function.
  • “roaming” in the embodiments of this application can also be understood as “Visit”, “include” in the embodiments of this application can also be understood as “carrying”, etc., and “storage” in the embodiments of this application can also be understood as “record” or “save”, etc.
  • the "roaming AS” can be replaced with “first AS”, the home AS can be replaced with “second AS”, etc.
  • the I-CSCF device or S-CSCF device roaming into the home area of the user equipment can be replaced with "the first AS”
  • Three CSCF devices”, etc. are uniformly described here, and are not specifically limited in this embodiment of the present application.
  • FIG. 4 is a flowchart of a calling method provided by an embodiment of the present application. As shown in FIG. 4 , the method assumes that the user equipment roams to the area (or home area) where the first CSCF device is located, and becomes the roaming inbound area of the first CSCF device user equipment, and participates in the calling service as a calling identity or a called identity, the method includes the following steps:
  • the first CSCF device receives the first communication message.
  • the first communication message is initiated by a calling party (caller/calling party, also called an originating party, originating party) and used to call a called party (callee/called party, also called a receiver or a terminating party, terminating party) communication messages, such as SIP messages, may also be called call messages or access messages.
  • the first communication message includes first call signaling initiated by the calling party, where the first call signaling may be SIP Invite signaling, and the first call signaling may include information of the calling party and information of the called party.
  • the first communication message may further include other information, for example, may further include a content-type (content-Type) header field used to indicate the media type of the call service (such as a voice call service or a video call service) corresponding to the first call signaling, Routing-related fields and message bodies used to identify the device through which the first call signaling passes.
  • Routing-related fields may include, but are not limited to, a via header field, a contact header field, or a record-route (record-route)/ Route header field
  • the message body may include session description information
  • the session description information includes media content blocking information, such as media content transmission mode, codec mode, and the like.
  • the information of the calling party is used to indicate the calling party or identify the originator of the first call signaling, including the calling party's number or the calling party's International Mobile Subscriber Identification (IMSI) or
  • IMSI International Mobile Subscriber Identification
  • the source address and the like of the first communication message may be carried in a from (from) header field or an asserted identity (P-Asserted-Identity, PAI) header field of the first communication message.
  • the information of the called party can be used to indicate the called party or identify the recipient of the first call signaling, including the phone number of the called party, the IMSI or the destination address of the first communication message, etc., which can be carried in the first in the to header field of the communication message.
  • the first CSCF device may be the P-CSCF device 12 or the P-CSCF device 21 or the P-CSCF device 32 in FIG. 3 .
  • Either the calling party or the called party of the first call signaling may be a flood-in user equipment of the first CSCF device.
  • an exemplary method for the first CSCF device to receive the first communication message is as follows:
  • the first CSCF device directly or indirectly receives the first communication message from the calling party, for example, through the calling party and An intermediate network element between the first CSCF devices receives the first communication message, and the intermediate network element may be an access network device, an SBC, or the like.
  • the calling party is UE1
  • UE1 moves from the coverage area of the access network device 10 to the coverage area of the access network device 20.
  • the first CSCF device is the P-CSCF device 21
  • the intermediate network element For the access network device 20
  • the first CSCF device is the P-CSCF device 32
  • the intermediate network elements are the access network device 20 and the SBC 31 .
  • the first CSCF device In the case that the called party of the first call signaling is the intruding user equipment of the first CSCF device, the first CSCF device directly or indirectly receives the first CSCF device from the second CSCF device in the home area of the called party.
  • the second CSCF device in the home area of the called party may be an I-CSCF device or an S-CSCF device in the home area of the called party.
  • the second CSCF device in the home area of UE2 is the I-CSCF device 14 or S in FIG. 3 .
  • - CSCF device 15 the second CSCF device in the home area of UE2 is the I-CSCF device 14 or S in FIG. 3 .
  • the first call signaling in this embodiment of the present application may also be other call signaling related to the call service infiltrating between the user equipment and other call devices, for example, it may also be The signaling shown in Table 1; however, for the convenience of description, the embodiment of the present application mainly uses SIP-Invite as an example to describe the related solution, and will not be repeated.
  • Table 1 is only an exemplary table, and this embodiment of the present application does not limit which type of signaling the first call signaling is.
  • the first call signaling may also be other signaling.
  • the first CSCF device Based on the first communication message, the first CSCF device causes the first call signaling to be routed to the roaming place AS of the inbound user equipment, and the roaming place AS is in the home area of the first CSCF device and is capable of providing call value-added services for the user equipment.
  • the first CSCF device routing the first call signaling to the roaming destination AS of the inbound user equipment based on the first communication message may include: the first CSCF device determining, based on the first communication message, the primary source of the first call signaling The calling party or the called party is the roaming user equipment of the first CSCF device, and directly sends the second communication message containing the first call signaling to the roaming AS; or, the first CSCF device passes through the home area of the first CSCF device
  • the second CSCF equipment makes the first call signaling routed to the roaming place AS of the inbound user equipment, such as the inbound user equipment is UE1 in Figure 3, and the roaming place AS of UE1 is AS24 or AS25 in Figure 3, Figure 3 4 are shown in S402(a)-S402(c), which are described as follows:
  • the first CSCF device determines, based on the first communication message, that the calling party or the called party of the first call signaling is the flood-in user equipment of the first CSCF device.
  • the first CSCF device can use the from header field in the first communication message or the The information of the calling party determines the home area of the calling party, and further determines that the home area of the calling party is different from the home area of the first CSCF, thereby determining that the calling party of the first call signaling is the intrusion user equipment of the first CSCF device , on the contrary, it is determined that the calling party is in its own home area, and is not flooding into the user equipment.
  • the first CSCF device can identify the home area according to the calling party's mobile phone number and the number segment and attribution of the mobile phone number shown in Table 2 below. The correspondence between the areas determines that the home area corresponding to the mobile phone number segment of the calling party is area 1.
  • the first CSCF device may, according to the information of the called party carried in the to header field in the first communication message, Determine the home area of the called party, and then determine that the home area of the called party is different from the home area of the first CSCF, so as to determine that the called party is the intruding user equipment of the first CSCF device, otherwise, determine that the called party is in its own in the home area.
  • the method may further include: the first CSCF device determines that the intrusion user equipment has The ability to call value-added services provided by the AS in the home area of the first CSCF device (that is, roaming into the roaming area of the user equipment) is used.
  • the AS in the roaming area is triggered to provide the call value-added service for the roaming user equipment, so as to avoid the situation that the roaming user equipment does not support the AS in the roaming area.
  • the provided call value-added service leads to the problem that the call value-added service in the roaming place cannot be used, thereby affecting the user experience.
  • the first CSCF device may obtain the capability information of the intrusion user equipment from the first communication message, or may request the HSS and other devices to obtain the capability information of the intrusion user equipment.
  • the first CSCF device may determine, according to a configuration policy and/or capability information of the intrusion user equipment, that the intrusion user equipment is capable of using the call value-added service provided by the AS in the home area of the first CSCF device.
  • the configuration policy may be used to determine a flood-in user equipment capable of using the call value-added service provided by the AS in the home area of the first CSCF device.
  • the configuration policy may include access information corresponding to the intrusion user equipment, for example, including one or more types of configuration information such as access network device information, cell location information, and access network type of the intrusion user equipment.
  • the configuration policy may be pre-stored on the first CSCF device or acquired by the first CSCF device from other devices (eg HSS), which is not limited.
  • the access information of the roaming user equipment satisfies the provisions of the configuration policy and/or the capability information of the roaming user equipment indicates that the roaming user equipment has the ability to process the call value-added services provided by the AS in the roaming area (such as media content decoding capabilities, network capability or storage capability, etc.), it is determined that the intruding user equipment has the capability to use the call value-added service provided by the AS in the home area of the first CSCF device.
  • the access network device information can be used to identify the access network device, and is an Internet (internet protocol, IP) address or a media access control (midia access control, MAC) address of the access network device, and the like.
  • IP Internet protocol
  • MAC media access control
  • the cell location information may be used to identify a certain cell, and the cell location information may be a physical cell identifier (physical cell identifier, PCI) or a cell global identifier (cell global identifier, CGI) of the cell.
  • PCI physical cell identifier
  • CGI cell global identifier
  • the access network type may be used to indicate a radio access technology (radio access technology, RAT) or a fixed access technology adopted by the access network.
  • the RAT may include any access technology among Bluetooth access, wireless-fidelity (wifi) access, new radio (NR) access, and long term evolution (LTE) access.
  • the fixed access technology may include local area network (LAN) technology, wireless local area network (WALN) technology, various types of digital subscriber line (digital subscribe line, xDSL) technology or xPON technology.
  • the first CSCF device may acquire capability information and access information of the intrusion user equipment from an access device of the intrusion user equipment.
  • S402(b) In response to the determination result of S402(a), the first CSCF device sends a second communication message to the second CSCF device in the home area of the first CSCF device.
  • the second CSCF device in the home area of the first CSCF device may be an I-CSCF device or an S-CSCF device in the home area of the first CSCF device.
  • the second communication message may be a SIP message, and the second communication message may include parameters included in an existing communication message (eg, the first communication message), such as including first call signaling, routing-related fields, message body, and the like .
  • the second communication message may further include the first indication information.
  • the name of the first indication information is not limited, and it may be called "intrusion identifier" or “routing identifier” or "flag1", which can be used to indicate that the calling party or the called party of the first call signaling is the first one.
  • the roaming user equipment of a CSCF device so that the second CSCF device can determine the calling party or the called party of the first call signaling as the roaming user equipment according to the first indication information, and the AS that triggers the roaming user equipment is the roaming user equipment.
  • the user equipment provides call value-added services.
  • the first indication information may further indicate that the first call signaling or the second call signaling of the call service corresponding to the first call signaling is routed to the roaming AS of the roaming user equipment.
  • the call service is as described above, the call signaling of the call service in the embodiment of the present application may include the first call signaling and the second call signaling, and the second call signaling of the call service refers to the first call signaling except the first call signaling.
  • Other call signaling related to the call service or other call signaling transmitted after the first call signaling, such as the second call signaling may include the signaling shown in Table 1 above.
  • the second call signaling of the corresponding call service may be called busy signaling, called shutdown signaling, and called no-response signaling , Called unreachable signaling, called waiting signaling, called call forwarding signaling, called ringing signaling, called off-hook signaling, calling on-hook signaling, and called on-hook signaling.
  • the first indication information is essentially a kind of "routing indication information", and the routing indication information can change the call route experienced by the call signaling of the call service transmitted between the calling party and the called party. It will pass through the roaming AS of the inbound user equipment, so that the call signaling of the call service is routed to the roaming location AS of the inbound user equipment, so that the roaming location AS of the inbound user equipment has the opportunity to provide the inbound user with call value-added services. For example, during the call service process, the flood-in user equipment is triggered to present the media content. After the call route experienced by the first call signaling of the call service (for example, the Invite message at the time of calling) is determined, the subsequent call signaling corresponding to the call service can be transmitted according to the call route.
  • the routing indication information can change the call route experienced by the call signaling of the call service transmitted between the calling party and the called party. It will pass through the roaming AS of the inbound user equipment, so that the call signaling of the call service is routed to the
  • each device on the call route can be stored correspondingly to the call service or communication session corresponding to the first call signaling, so that after subsequent reception of other call signaling corresponding to the same call service or communication session, it can be obtained according to the stored correspondence. the first indication information, and then determine to route the first call signaling to the roaming AS according to the first indication information.
  • the original route of the SIP Invite can be changed through the first indication information: (calling party-calling party The first CSCP device in the roaming area of the calling party - the I-CSCF device/S-CSCF device - the called party in the calling party's home area) is changed to the following route: (calling party - in the calling party's roaming area First CSCP device - I-CSCF device/S-CSCF device of the calling party's roaming area - calling party's roaming place AS - I-CSCF device/S-CSCF device of the calling party's roaming area - calling party The I-CSCF device/S-CSCF device of the home area - the called party).
  • the I-CSCF device/S-CSCF device, the I-CSCF device/S-CSCF device of the calling party's home area, etc. may store the first indication information corresponding to the call service or communication session corresponding to the first call signaling, For example, the first indication information is stored corresponding to the call service identifier or the communication session identifier.
  • each device of the above-mentioned modified route may use the following manner 1 or manner 2 to carry the first indication information in a communication message (such as a second communication message or other communication message):
  • the first indication information is carried by a new header field in the communication message, for example, the new header field may be an incoming visit indication header field (P-visted-incoming-indication).
  • Manner 2 Carry the first indication information through the attribute of the header field existing in the communication message, for example, include the roam-incoming-indication in the attribute of the existing P-Access-Network-Info header field , the value of roam-incoming-indication identifies whether the calling party or the called party of the first call signaling is a flood-in user equipment.
  • the first CSCF device sending the second communication message to the AS in the home area of the first CSCF device may include: A CSCF device sends a second communication message to a second CSCF device in the home area of the first CSCF device, and the second CSCF device may be an I-CSCF device/S-CSCF device in the home area of the first CSCF device; the second CSCF device The CSCF device receives the second communication message, and sends the second communication message to the home AS of the first CSCF.
  • the calling party or the called party of the first call signaling is the intruding user equipment of the first CSCF device
  • the intruding user equipment is not registered in the home area of the first CSCF device, so the first CSCF device
  • the registration information of the intruding user equipment does not exist on the device, and the first CSCF device cannot locally find the I-CSCF device/S-CSCF device registered by the intruding user equipment.
  • the first CSCF device may randomly select one CSCF device as the second CSCF device from the plurality of CSCF devices in the home area of the first CSCF device, or, according to the principle of load balancing, in the home region of the first CSCF device Among the multiple CSCF devices in the area, the CSCF device with the smallest load or the load less than the preset threshold is selected as the second CSCF device.
  • the preset threshold can be set as required, and is not limited.
  • the multiple CSCF devices in the home area of the first CSCF device may be multiple I-CSCS devices or S-CSCF devices in the home area of the first CSCF device.
  • selecting the CSCF device with the least load as the second CSCF device may include: if the first call signaling carried in the first communication message is the Mth first call signaling received by the first CSCF device, selecting the first call signaling
  • the first CSCF device may carry the received first call signaling with Send it to the first I-CSCF device in the communication message, carry the received second first call signaling in the communication message and send it to the second I-CSCF device, and send the received third first call signaling to the second I-CSCF device.
  • the call signaling is carried in the communication message and sent to the third I-CSCF device
  • the received fourth first call signaling is carried in the communication message and sent to the fourth I-CSCF device, and so on.
  • the received fifth first call signaling is carried in the communication message and sent to the fifth I-CSCF device, and the sixth first call signaling is carried in the communication message and sent to the first I-CSCF device, The eighth first call signaling is carried in the communication message and sent to the third I-CSCF device.
  • the second communication message may also include address information of the second CSCF device, for example, the routing related field of the second communication message includes address information of the second CSCF device, so that the previous hop of the second CSCF device can The address information of the second CSCF device enables the first call signaling or the second call signaling of the call service corresponding to the first call signaling to be routed to the second CSCF device.
  • the second CSCF device in the home area of the first CSCF device receives the second communication message sent by the first CSCF device, and routes the first call signaling to the roaming user equipment based on the second communication message ground AS.
  • the second CSCF device in the home area of the first CSCF device determines, according to the first indication information included in the second communication message, that the calling party or the called party of the first call signaling is the diffuser of the first CSCF device.
  • the inbound user equipment sends a second communication message to the roaming AS of the inbound user equipment.
  • the second CSCF device in the home area of the first CSCF device may associate the first indication information with the first call signaling. Call services or communication sessions are stored correspondingly.
  • the second CSCF device may traverse each AS in the home area of the first CSCF device, and check whether the second communication message exists in the home area of the first CSCF device according to the header field or message content of the received second communication message.
  • the trigger condition provided by the AS in the CSCF that is, the roaming place AS of the user equipment
  • that is, the judgment of the iFC is performed, and if there is, a second communication message is sent to the AS in the home area of the first CSCF device to trigger the
  • the AS in the home area of the CSCF device provides the call value-added service to the inbound user equipment. If it does not exist, the second communication message is not sent, and the AS in the home area of the first CSCF device is not triggered to provide the call value-added service.
  • the above-mentioned second CSCF device checks, according to the header field or message content of the second communication message, whether the second communication message exists to satisfy the trigger condition set by the AS in the home area of the first CSCF device.
  • S402(b)-S402(c) can be applied to the scenario where the first CSCF device is separated from the second CSCF device.
  • the second CSCF device is centrally deployed in the first CSCF device.
  • S402(b)-S402(c) may be replaced by the first CSCF device directly sending the second communication message to the roaming AS of the inbound device.
  • the first CSCF device receives the first communication message, after determining that the calling party or the called party of the first call signaling is the inbound user equipment according to the first communication message, it performs iFC triggering logic, according to the header field or message of the first communication message. content, determine which AS in the home area of the first CSCF device the trigger condition for the existence of the first communication message meets the trigger condition, send the second communication message to the AS, and trigger the AS to provide the call value-added service.
  • the roaming AS of the inbound user equipment receives the second communication message, and provides a call value-added service for the inbound user equipment based on the second communication message.
  • the manner in which the roaming site AS of the inbound user equipment provides the value-added call service for the inbound user equipment based on the second communication message may be the following manner 1 or manner 2:
  • Mode 1 The roaming AS of the roaming user equipment determines that the calling party or the called party of the first call signaling is the roaming user equipment according to the first indication information in the second communication message. If the roaming AS processes the policy according to the service priority If it is determined that the roaming AS will preferentially provide the call value-added service for the inbound user equipment, before connecting the call, the inbound user equipment is provided with the call value-added service to complete the roaming service logic with the inbound user equipment.
  • the roaming AS can establish a media channel with the inbound user equipment before connecting the call, provide the inbound user equipment with a media stream corresponding to the value-added call service through the media channel, and trigger the inbound user equipment in the first call signaling
  • the corresponding call service-related APP interface presents media content, or game content, etc., and uses call value-added services.
  • the AS at the roaming site may provide the call value-added service for the roaming user equipment before the connection of the call is completed or during the process of the connection of the call. For example, taking the calling party as the inbound user equipment, the call service as the voice call service, and the call value-added service as the CRBT service as an example, during the period before the calling party dials the phone number-the called party rings, the roaming destination The AS provides CRBT services to the calling party.
  • connecting a call may refer to a process from when the roaming AS sends the first call signaling to the called party until the first call signaling reaches the called party.
  • connecting the call may include S504-S507 shown in FIG. 5 .
  • connecting the call may include: the roaming AS of the roaming user equipment to the first CSCF device or the second CSCF in the home area of the first CSCF device The device sends the first call signaling.
  • the first CSCF device or the second CSCF device in the home area of the first CSCF device receives the first call signaling, sends the first call signaling to the called party, and the call connection is completed.
  • the service priority processing policy can be used to specify the priority of the roaming AS and the home AS to provide call value-added services, and can be used to specify whether the roaming AS provides the call value-added services to the inbound user equipment first, or whether the home AS provides the call value-added services preferentially.
  • the AS preferentially provides call value-added services to the inbound user equipment.
  • the service priority processing policy may be pre-configured in the roaming AS, the home AS of the inbound user equipment, or may be acquired by the roaming AS from other devices, such as from the HSS.
  • the roaming location AS of the inbound user equipment determines that the calling party or the called party of the first call signaling is the inbound user equipment according to the first indication information in the second communication message. If the roaming location AS processes the policy according to the service priority If it is determined that the roaming AS will preferentially provide call value-added services for the inbound user equipment, it will provide the inbound user equipment with call value-added services. It should be understood that at this time, the roaming AS can perform preparations such as transmission of configuration information for the provision of call value-added services. , and does not provide call value-added services to inbound user equipment.
  • the roaming AS sends a third communication message to the first CSCF device or the second CSCF device in the home area of the first CSCF device to implement call connection.
  • the third communication message includes first call signaling, first indication information, and second indication information, and the second indication information is used to indicate that the roaming AS will provide call value-added services for the roaming user equipment.
  • the second indication information may be included in the third communication message, or may not be included in the third communication message, which is not limited.
  • a fifth communication message is sent from the third CSCF device in the home area of the user equipment to the first CSCF device or the second CSCF device in the home area of the first CSCF device, and the fifth communication message includes the first CSCF device.
  • One indication information; the first CSCF device or the second CSCF device in the home area of the first CSCF device sends a sixth communication message to the roaming AS according to the first indication information, and the sixth message includes the first indication information and the third indication information.
  • the roaming AS receives a sixth communication message from the first CSCF device or the second CSCF device in the home area of the first CSCF device, where the sixth communication message includes the first indication information.
  • the first CSCF device or the second CSCF device in the home area of the first CSCF device may directly send the sixth communication message to the roaming AS, and may also send the sixth communication message to the roaming AS through an intermediate device, No restrictions.
  • the fifth communication message and the sixth communication message may also include third indication information.
  • the third indication information is used to indicate that the home AS of the roaming user equipment will provide the call value-added service for the roaming user equipment; on the contrary, if the home AS of the roaming user equipment determines according to the service priority policy, the roaming AS will give priority to If the inbound user equipment provides the call value-added service, the fifth communication message and the sixth communication message do not include the third indication information.
  • the roaming AS determines, according to the service priority processing policy and the third indication information, whether the roaming AS preferentially provides call value-added services for the intruding user equipment. Service, if yes, provide call value-added services for inbound user equipment, if not, do not provide.
  • the roaming AS may store the first indication information corresponding to the call service or communication session corresponding to the first call signaling.
  • the first call signaling is routed to the flood-in user equipment of the first CSCF device.
  • the roaming AS provides call value-added services for the roaming user equipment. Since the user equipment roaming outside the home area of the user equipment is relatively close to its roaming AS, the roaming AS that roams into the user equipment provides call value-added services for the user equipment. The closer the distance is, the lower the end-to-end delay between the roaming user equipment and the roaming AS, which improves user experience.
  • the application server can not only provide call value-added services for the local calling party, but also provide call value-added services for the inbound user equipment roaming to the home area, adding AS to the calling party Opportunities to provide services and improve network resource utilization.
  • the calling party of the first call signaling is the inbound user equipment
  • the roaming site AS of the inbound user equipment has provided call value-added services for the inbound user equipment before connecting the call as an example, the corresponding implementation of FIG. 4
  • the splicing process described in the example is described.
  • connection process when the called party of the first call signaling is the intrusion user equipment reference may be made to the prior art, which will not be repeated.
  • FIG. 5 is a flowchart of a calling method provided by an embodiment of the present application, and the method includes S501-S507:
  • S501-S503 are executed. Among them, S501-S503 are the same as S401-S403 in FIG. 4 , and will not be repeated.
  • the roaming destination AS of the roaming user equipment sends a third communication message to the second CSCF device in the home area of the first CSCF device.
  • the above-mentioned third communication message may include the first call signaling, the first indication information, and other existing header fields or messages.
  • the home AS of the intruding user equipment may be triggered to provide call value-added services for the intruding user equipment.
  • the third communication message may further include the second communication message.
  • Indication information to indicate that the roaming place AS of the intruding user equipment has provided the call value-added service for the intruding user equipment, so that the home AS of the intruding user equipment knows according to the second indication information that the roaming place AS of the intruding user equipment has been
  • the inbound user equipment provides call value-added services without triggering the home service process.
  • the name of the second indication information is not limited, and may be called "service identifier" or “flag2" or "roaming location service identifier".
  • the second indication information may be as described above, indicating that the roaming AS has provided the inbound user equipment with call value-added services.
  • the roaming AS determines that it may provide call value-added services for the inbound user equipment, and is preparing to provide the call value-added services, then the second indication information can be used to instruct the roaming AS to provide the inbound user equipment with call value-added services business.
  • the home AS or other AS can also allocate an indication information, such as the first Three indication information, the third indication information can indicate that the home AS or other AS will provide the intrusion user equipment with the indication information of the value-added call service, so that the AS that receives the third indication information can know the home AS according to the third indication information Or in the case of other ASs that provide call value-added services, take corresponding measures to avoid service conflicts.
  • an indication information such as the first Three indication information
  • the third indication information can indicate that the home AS or other AS will provide the intrusion user equipment with the indication information of the value-added call service, so that the AS that receives the third indication information can know the home AS according to the third indication information Or in the case of other ASs that provide call value-added services, take corresponding measures to avoid service conflicts.
  • the second indication information is essentially a kind of "service indication information", and the service indication information can avoid flooding into the home AS or other AS and roaming places in the home area of the user equipment.
  • the second indication information may be routed to the home AS or other AS in the home area of the user equipment according to the call route of the first call signaling, such as the call route of the first call signaling
  • the device on the device can carry the second indication information in the communication message and route it to the home AS or other AS in the home area of the inbound user equipment, so that the home AS or other AS can know according to the second indication information that the roaming AS is a diffuse AS.
  • Incoming user equipment provides call value-added services to avoid conflicts with roaming AS services.
  • each device on the call route of the first call signaling may carry the second indication information in a communication message (such as a third communication message or other communication message) by adopting the following manner 1, manner 2, or manner 3:
  • the second indication information is carried by a new header field in the communication message, for example, the new header field may be an input service indication header field (P-visited-service-indication).
  • Manner 2 Carrying the second indication information through the attribute of the existing header field in the communication message, for example, the attribute of the existing P-Asserted-Service-Info header field includes the service code (service-code), service-code
  • service-code service-code
  • the value of can identify that the roaming AS of the inbound user equipment has provided call value-added services for the inbound user equipment.
  • the second CSCF device in the home area of the first CSCF device receives the third communication message, and sends the fourth communication message to the second CSCF device in the home area of the user equipment that has infiltrated into the user equipment.
  • the second CSCF device in the home area of the user equipment may be an I-CSCF device or an S-CSCF device in the home area of the user equipment.
  • the fourth communication message described in S505 may include content included in the third communication message, for example, may include first call signaling, first indication information, and second indication information.
  • the second CSCF device in the home area of the first CSCF device may determine the home area of the inbound user equipment according to the number segment of the inbound user equipment, and obtain the inbound user equipment from the HSS in the home area of the inbound user equipment.
  • the subscription information of the user equipment determines a third CSCF device in the home area of the inbound user equipment according to the subscription information of the ingress user equipment, and sends a fourth communication message to the third CSCF device in the home area.
  • the third CSCF device may include an I-CSCF device or an S-CSCF device that floods into the home area of the user equipment, or other devices capable of receiving the fourth communication message and routing the fourth communication message to the home AS. equipment.
  • the third CSCF device roaming into the home area of the user equipment may associate the first indication information with the first call signaling.
  • the corresponding call service or communication session is correspondingly stored.
  • S506 The third CSCF device in the home area of the intruding user equipment receives the fourth communication message, and sends the seventh communication message to the home AS of the intruding user equipment.
  • the home AS that floods into the user equipment receives the seventh communication message, interacts with the HSS in the home area to obtain the iFC trigger condition of the home AS; checks whether there is an iFC trigger condition that satisfies the home AS in the seventh communication message , if satisfied, send the seventh communication message to the home AS.
  • the home AS of the roaming user equipment may store the first indication information corresponding to the call service or communication session corresponding to the first call signaling.
  • the home AS of the roaming user equipment receives the seventh communication message, and in response to the seventh communication message, learns according to the second indication information in the seventh communication message that the roaming AS of the roaming user equipment has provided the roaming user equipment. Call value-added services without triggering the home business process. Further, the home AS of the inbound user equipment releases the first call signaling, routes the first call signaling sent by the calling party to the called party this time to the called party, and completes the call connection. The call route experienced by call signaling is opened.
  • the roaming site AS of the roaming user equipment does not provide call value-added services to the roaming user equipment before the connection call initiated by the roaming site AS, but determines that it is ready or plans to provide call value-added services to the roaming user equipment.
  • the second indication information included in the third communication message sent by the roaming AS may be used to indicate that the roaming AS will provide call value-added services for the roaming user equipment.
  • the home AS receives the second indication information, and can determine whether to provide call value-added services to the inbound user equipment or the roaming AS first, according to the service priority processing policy.
  • the home AS has priority
  • use the third The indication information replaces/covers the second indication information, and the third indication information is fed back to the roaming AS, so that the service priority processing policy of the roaming AS and the third indication information are finally determined to be provided by the roaming AS or the home AS; On the contrary, if the roaming AS has priority, the home AS does not trigger the home service process and continues the call.
  • the method further includes: routing the first call signaling or the second call signaling of the call service corresponding to the first call signaling to the roaming AS based on the seventh communication message in the home AS of the roaming user equipment. :
  • the home AS of the inbound user equipment receives the incoming call from the called party.
  • the second call signaling/subsequent call signaling of the call service (such as the response message corresponding to the Invite message)
  • the third CSCF in the home area of the user equipment
  • the device sends an eighth communication message including the second call signaling of the call service, the first indication information and the third indication information, and the third indication information indicates that the second AS will provide the call value-added service for the intruding user equipment.
  • the home AS of the roaming user equipment receives the call from the called party After the second call signaling/subsequent call signaling of the service (such as the response message corresponding to the Invite message), send the eighth communication message to the third CSCF device according to the first indication information in the seventh communication message, the eighth communication message
  • the second call signaling and the first indication information of the call service are included.
  • the home AS of the inbound user equipment according to the seventh communication message
  • the first indication information in the user equipment sends an eighth communication message containing the first call signaling of the call service, the first indication information and the third indication information to the third CSCF device in the home area of the user equipment, and the third indication
  • the information indicates that the second AS will provide call value-added services for the intruding user equipment.
  • the home AS of the inbound user equipment receives the incoming call from the called user equipment.
  • the first call signaling/subsequent call signaling (such as the response message corresponding to the Invite message) of the party's call service
  • send the eighth communication message to the third CSCF device according to the first indication information in the seventh communication message
  • the third Eight communication messages include the first call signaling and the first indication information of the call service.
  • the third CSCF device in the home area of the user equipment determines, according to the stored correspondence between the first indication information and the call service or the communication session, the first indication information corresponding to the call service this time, according to the first indication information.
  • the indication information routes the content contained in the eighth communication message to the P-CSCF device or the I-CSCF device/S-CSCF device roaming into the roaming area of the user equipment.
  • the method shown in FIG. 4 is described below with reference to the flow diagram of the invite message shown in FIG. 6 . It is assumed that the calling party of the first call signaling UE1, UE1 calls UE2, the home area of UE1 is area 1, and UE1 is currently roaming to the area 2. The home area of UE2 is area 3, and the indication information used to indicate that the calling party of the first call signaling is the inbound user equipment is named the network identifier, and the indication information used to indicate that the AS will provide the inbound user equipment with call value-added services Named Business ID.
  • the message flow shown in Figure 6 includes the following processes:
  • (1) UE1 sends an invite message to the P-CSCF device in area 2.
  • the P-CSCF device determines that UE1 is a flood-in user equipment according to the from header field of the invite message, assigns the network identifier 1, and sends the network identifier 1 and the invite message to the I-CSCF device/S-CSCF device in the area 2 .
  • the I-CSCF device in the area 2 sends the received network identity 1 and the invite message to the S-CSCF device.
  • the S-CSCF device in the area 2 completes the iFC trigger logic, and sends the network identifier 1 and the invite message to the AS1 in the area 2 that satisfies the iFC trigger condition.
  • AS1 receives the network identifier 1 and the invite message, determines to provide call value-added services for the intruding user equipment, and allocates the service identifier 1 used to identify that AS1 will provide call value-added services for UE1 to the I-CSCF equipment in area 2/S-
  • the CSCF device sends the network ID 1, the service ID 1 and the invite message.
  • the I-CSCF device/S-CSCF device in area 2 receives the network identifier 1, service identifier 1 and the invite message, and sends the network identifier 1, service identifier 1 and invite to the I-CSCF device/S-CSCF device in area 1. information.
  • the I-CSCF device in area 1 sends the received network identifier 1, service identifier 1 and invite message to the S-CSCF device in area 1.
  • the S-CSCF device in area 1 completes the iFC trigger logic and sends the message to area 1.
  • the AS2 that satisfies the iFC trigger condition sends the network ID 1, the service ID 1 and the invite message.
  • the AS2 that satisfies the iFC trigger condition in the area 1 receives the network ID 1, the service ID 1 and the invite message, and if it is determined according to the service priority processing policy that the AS2 provides the UE1 with the priority of calling value-added services, the service ID 2 is used to replace the service ID 1 and service ID 2 are used to indicate that AS2 will provide call value-added services for UE1, and send network ID 1, service ID 2 and an invite message to the I-CSCF device/S-CSCF device in area 1.
  • the network ID 1, the service ID 1 and the invite message are sent to the I-CSCF device/S-CSCF device in the area 1.
  • the I-CSCF device/S-CSCF device in the area 1 receives the network ID 1, the service ID 2 and the invite message, sends the invite message to the UE2, and completes the connection call. Subsequently, route network ID 1, service ID 2/service ID 1 to AS1 in the roaming area of UE1, and AS1 finally determines whether AS1 provides the call value-added service or the AS2 provides call value-added services, so that a media channel is established between UE1 and the AS that ultimately provides call value-added services, and the call value-added services are received and presented.
  • FIG. 6 describes the calling method provided by the present application by taking the calling party of the first call signaling roaming to an area other than the home area/registration area as an example.
  • the method shown in FIG. 4 can be referred to, and the first call signaling reason sent to the called party can be sent to the IMS of the roaming area of the called party
  • the AS in the roaming area of the called party that is, the roaming place AS of the called party
  • the following describes the processing flow when the called party is in a roaming area with reference to the flow diagram of the invite message shown in FIG. 7 .
  • the called party of the first call signaling is UE1, UE3 calls UE1, and the home area of UE1 is area 1 , UE1 is currently roaming to area 2, and the indication information used to indicate that the called party of the first call signaling is roaming into the user equipment is named network identity, and the indication information used to instruct the AS to provide call value-added services for the called party is named service logo.
  • the message flow shown in Figure 7 includes the following processes:
  • UE3 sends an invite message to the home area of UE1: I-CSCF equipment/S-CSCF equipment in area 1.
  • the I-CSCF device/S-CSCF device in the area 1 receives the invite message, completes the iFC trigger logic, and sends the invite message to the AS3 in the area 1 that satisfies the iFC trigger condition.
  • AS in area 1 that satisfies the iFC trigger condition receives the invite message, and in the case of determining to provide call value-added services for UE1, allocates service identifier 3, and sends service identifier 3 to the I-CSCF equipment/S-CSCF equipment in area 1 and invite messages.
  • the I-CSCF device/S-CSCF device in the area 1 receives the service identifier 3 and the invite message, and sends the service identifier 3 and the invite message to the P-CSCF device in the area 2.
  • the P-CSCF device in area 2 receives the service identifier 3 and the invite message, and according to the to header field of the invite message, determines that UE1 is a flooded user equipment, allocates network identifier 2, and sends the message to the I-CSCF device in area 2.
  • Network ID 2, Service ID 3, and invite message are examples of the P-CSCF device in area 2.
  • the I-CSCF device in the area 2 sends the received network ID 2, service ID 3 and invite message to the S-CSCF device.
  • the S-CSCF device in the area 2 completes the iFC triggering logic, and sends the network identifier 2, the service identifier 3 and the invite message to the AS4 in the area 2 that satisfies the iFC trigger condition.
  • AS4 in area 2 receives network ID 2, service ID 3 and invite message according to service ID 3 and service priority processing strategy to finally determine whether AS3 provides call value-added services or AS4 provides call value-added services, so that UE1 and finally provide call A media channel is established between ASs of value-added services to receive and present call value-added services.
  • AS4 sends the invite message to the I-CSCF device/S-CSCF device in area 2.
  • the I-CSCF device/S-CSCF device in the area 2 receives the invite message, and sends the invite message to the P-CSCF device in the area 2.
  • the P-CSCF device in area 2 receives the invite message, sends the invite message to UE1, and completes the connection call.
  • the following describes the processing flow of the calling party's roaming AS providing call value-added services to the calling party with reference to the architecture shown in Fig. 3. It is assumed that the first call signaling is an invite message, the calling party is UE1, and the called party is UE2, UE1 is in a roaming area, UE2 is in a home area, and AS1 in the roaming area of UE1 provides call value-added services to UE1.
  • FIG. 8 is a flowchart of a calling method provided by an embodiment of the present application, and the method includes:
  • S801 UE1 sends an invite message to a P-CSCF device in the roaming area in the roaming area.
  • the P-CSCF device determines, according to the from header field in the invite message, that the UE1 is a flood-in user equipment.
  • the process for the P-CSCF device to determine that UE1 is the inbound user equipment according to the from header field in the invite message may refer to the description in the embodiment corresponding to FIG. 4 , which will not be repeated.
  • the P-CSCF device determines, according to the configuration policy and/or the capability information of the UE1, that the UE1 is capable of using the value-added call service provided by the AS in the roaming area, and allocates first indication information, where the first indication information is used to indicate that the UE1 is a roaming user equipment.
  • the specific process for the P-CSCF device to determine, according to the configuration policy and/or the capability information of UE1, that UE1 has the capability to use the call value-added service provided by the AS in the roaming area can be referred to the embodiment corresponding to FIG. 4 , which will not be repeated. .
  • the P-CSCF device sends an invite message and the first indication information to the I-CSCF device/S-CSCF device in the home area of the P-CSCF device.
  • the invite message and the first indication information may be included in the same communication message and sent to the I-CSCF device/S-CSCF device in the home area of the P-CSCF device.
  • the invite message and the first indication information may be respectively carried in different header fields in the communication message and sent to the I-CSCF device/S-CSCF device in the home area of the P-CSCF device.
  • the P-CSCF device may send to the I-CSCF device/S-CSCF device with the smallest load or the I-CSCF device/S-CSCF device with the load less than a preset threshold among multiple I-CSCF devices/S-CSCF devices in the home area of the P-CSCF device.
  • Send the invite message and the first indication information For the specific implementation process, reference may be made to the description in the embodiment corresponding to FIG. 4 , which will not be repeated.
  • the I-CSCF device/S-CSCF device receives the invite message and the first indication information, determines that the invite message is an invite message initiated by the intruding user equipment according to the first indication information, executes the iFC triggering logic, and sends the message to the P-CSCF device.
  • the AS1 in the home area that satisfies the iFC trigger logic sends the invite message and the first indication information.
  • S806 AS1 receives the invite message and the first indication information, determines that the invite message is an invite message initiated by the intrusion user equipment according to the first indication information, and determines that the AS in the roaming area prioritizes the invite user equipment according to the service priority processing policy Provide call value-added services, then AS1 completes the roaming business logic with UE1.
  • the home AS of UE1 may be triggered to provide call value-added services for UE1.
  • the AS1 in the roaming area also needs to allocate the second indication information and assign the first indication during the call connection process.
  • the second indication information is routed to the home AS of UE1, and the second indication information can be used to indicate that AS1 has provided call value-added services for UE1, so that the home AS determines that AS1 has provided call value-added services for UE1 according to the second indication information, without triggering the home business process flow.
  • S807 AS1 allocates second indication information, where the second indication information is used to indicate that AS1 has provided call value-added services for UE1, and sends an invite message, a first indication information and second indication information.
  • the I-CSCF device/S-CSCF device in the home area of the P-CSCF device receives the invite message, the first indication information and the second indication information, and converts the invite message, the first indication information and the second indication information according to the first indication information
  • the indication information is sent to the I-CSCF device/S-CSCF device in the home area of UE1.
  • the I-CSCF device/S-CSCF device in the home area of UE1 receives the invite message, the first indication information and the second indication information, executes iFC trigger logic, and sends an invite to AS2 in the home area of UE1 that satisfies the iFC trigger logic message, first indication information and second indication information.
  • S810 AS2 receives the invite message, the first indication information and the second indication information, according to the second indication information, the home AS determines that AS1 has provided the call value-added service for UE1 according to the second indication information, does not trigger the home service processing flow, and sends UE1
  • the I-CSCF device/S-CSCF device in the home area of the device sends the invite message and the first indication information.
  • the I-CSCF device/S-CSCF device in the home area of UE1 receives the invite message and the first indication information from AS2, and sends the message to the I-CSCF device/S in the home area of UE2 according to the to header field in the invite message.
  • the CSCF device sends an invite message to complete the connection call.
  • the call connection process may include: the I-CSCF device/S-CSCF device in the home area of UE2 receives the invite message, executes the iFC trigger logic, and sends the invite message to the AS that satisfies the iFC trigger logic in the home area of UE2;
  • the home AS of the UE2 receives the invite message, and completes the home service logic with the UE2 under the condition that it is determined to provide the call value-added service for the UE2. Wherein, for this process, reference may be made to the prior art, which will not be repeated.
  • the home AS of UE2 sends an invite message to the I-CSCF device/S-CSCF device in the home area of UE2, and the I-CSCF device/S-CSCF device in the home area of UE2 receives the invite message and sends it to the home area of UE2.
  • the P-CSCF device of the UE2 sends the invite message, and the P-CSCF device in the home area of the UE2 receives the invite message and sends the invite message to the UE2.
  • UE2 After receiving the invite message, UE2 returns a response message corresponding to the invite message to UE1. Exemplarily, UE2 may return a response message corresponding to the invite message to UE1 according to the sending path of the invite message.
  • the P-CSCF device in the roaming area of UE1 can route the invite message initiated by UE1 to the IMS network in the roaming area of UE1, and the roaming area of UE1 will send the invite message to the IMS network in the roaming area of UE1.
  • the AS provides call value-added services for UE1.
  • the second indication information allocated by the AS in the roaming area of UE1 is sent to the home during the call connection process.
  • the home AS so that the home AS determines according to the second indication information that the AS1 has provided the call value-added service for the UE1, and does not trigger the home service processing flow.
  • FIG. 8 illustrates the calling method provided by the present application by taking the AS in the roaming area preferentially providing call value-added services for UE1 as an example.
  • the home AS may preferentially provide call value-added services for UE1.
  • the following describes the processing flow for the calling party's home AS to provide call value-added services to the calling party with reference to the architecture shown in Figure 3. It is assumed that the first call signaling is an invite message, the calling party is UE1, and the called party is UE2, UE1 calls UE2, UE1 is in a roaming area, UE2 is in a home area, and the home AS preferentially provides call value-added services for UE1.
  • FIG. 9 is a flowchart of a calling method provided by an embodiment of the present application, and the method includes:
  • S901 UE1 sends an invite message to a P-CSCF device in the roaming area in the roaming area.
  • the P-CSCF device determines, according to the from header field in the invite message, that the UE1 is a flood-in user equipment.
  • the process for the P-CSCF device to determine that UE1 is the inbound user equipment according to the from header field in the invite message may refer to the description in the embodiment corresponding to FIG. 4 , which will not be repeated.
  • the P-CSCF device determines, according to the configuration policy and/or the capability information of UE1, that UE1 has the capability to use the value-added call service provided by the AS in the roaming area, and allocates first indication information, where the first indication information is used to identify UE1 as roaming in user equipment.
  • the specific process for the P-CSCF device to determine, according to the configuration policy and/or the capability information of UE1, that UE1 has the capability to use the call value-added service provided by the AS in the roaming area can be referred to the embodiment corresponding to FIG. 4 , which will not be repeated. .
  • the P-CSCF device sends an invite message and the first indication information to the I-CSCF device/S-CSCF device in the home area of the P-CSCF device.
  • the invite message and the first indication information may be included in the same communication message and sent to the I-CSCF device/S-CSCF device in the home area of the P-CSCF device.
  • the P-CSCF device may send to the I-CSCF device/S-CSCF device with the smallest load or the I-CSCF device/S-CSCF device with the load less than a preset threshold among multiple I-CSCF devices/S-CSCF devices in the home area of the P-CSCF device.
  • Send the invite message and the first indication information For the specific implementation process, reference may be made to the description in the embodiment corresponding to FIG. 4 , which will not be repeated.
  • the I-CSCF device/S-CSCF device receives the invite message and the first indication information, determines that the invite message is an invite message initiated by the intruding user equipment according to the first indication information, executes the iFC triggering logic, and reports to the P-CSCF device
  • the AS1 in the home area that satisfies the iFC trigger logic sends the invite message and the first indication information.
  • S906 AS1 receives the invite message and the first indication information, determines according to the first indication information that it is not going to provide call value-added services for the intruding user equipment, and sends the message to the I-CSCF device/S-CSCF device in the home area of the P-CSCF device. Send the invite message and the first indication information.
  • the I-CSCF device/S-CSCF device in the home area of the P-CSCF device receives the invite message and the first indication information, and sends the invite message and the first indication information to the home area of the UE1 according to the first indication information.
  • I-CSCF device/S-CSCF device receives the invite message and the first indication information, and sends the invite message and the first indication information to the home area of the UE1 according to the first indication information.
  • the I-CSCF device/S-CSCF device in the home area of UE1 receives the invite message and the first indication information, executes the iFC trigger logic, and sends the invite message and the first indication to AS2 in the home area of UE1 that satisfies the iFC trigger logic information.
  • AS2 receives the invite message and the first indication information, and determines, according to the service priority processing policy, that the home site AS2 of UE1 preferentially provides call value-added services for the intruding user equipment UE1. Further, AS2 completes the home service logic with UE1.
  • the completion of the home service logic between AS2 and the UE1 may include: the home AS2 of the UE1 may establish a media channel with the user equipment, provide the user equipment with a media stream corresponding to the value-added service through the media channel, and trigger the user equipment.
  • a call value-added service such as media content or game content is provided on the APP interface related to the call service corresponding to the first call signaling.
  • the home site AS2 of UE1 may establish a media channel with the user equipment when the call service of the user equipment starts, is in progress, or ends.
  • the AS in order to avoid routing the first call signaling or other call signaling related to the call service initiated by UE1 to AS1 in the roaming area of UE1, the AS in the roaming area of UE1 and the attribution of UE1 At the same time, the regional AS provides the UE1 with the problem of service conflict caused by calling value-added services.
  • AS2 sends the first indication information and the third indication information for indicating that AS2 is about to provide call value-added services for UE1 to the I-CSCF equipment/S-CSCF equipment in the home area of UE1.
  • the S-CSCF device sends the first indication information and the third indication information for indicating that AS2 is about to provide the call value-added service for UE1 according to the first indication information, through the I-CSCF device/S-CSCF device in the roaming area of UE1 It is sent to the AS in the roaming area of UE1, and the AS in the roaming area of UE1 judges the service priority and does not trigger the roaming service processing flow after it is determined that the home AS provides the value-added call service.
  • the process may include the following S910-S911:
  • S910 AS2 sends an invite message, first indication information and third indication information to the I-CSCF device/S-CSCF device in the home area of UE1.
  • the third indication information is used to instruct AS2 to provide call value-added services for UE1.
  • the I-CSCF device/S-CSCF device in the home area of UE1 receives the invite message, the first indication information and the third indication information from AS2, and sends the message to the I-CSCF device in the home area of UE2 according to the to header field in the invite message.
  • the CSCF device/S-CSCF device sends an invite message to complete the connection call.
  • the call connection process may include: the I-CSCF device/S-CSCF device in the home area of UE2 receives the invite message, executes iFC trigger logic, and sends the invite message to the AS in the home area of UE2 that satisfies the iFC trigger logic.
  • the home AS of UE2 receives the invite message, and completes the home service logic with UE2 when it is determined to provide call value-added services for UE2. For this process, reference may be made to the prior art, which will not be repeated.
  • the home AS of UE2 sends an invite message to the I-CSCF device/S-CSCF device in the home area of UE2.
  • the I-CSCF device/S-CSCF device in the home area of UE2 receives the invite message, and sends the invite message to the P-CSCF device in the home area of UE2.
  • the P-CSCF device in the home area of UE2 receives the invite message and sends the invite message to UE2.
  • UE2 After receiving the invite message, UE2 returns a response message corresponding to the invite message to UE1. Exemplarily, UE2 may return a response message corresponding to the invite message to UE1 according to the sending path of the invite message.
  • UE2 sends a response message corresponding to the invite message to the P-CSCF device in the home area of UE2, and the P-CSCF device in the home area of UE2 sends an invite to the I-CSCF device/S-CSCF device in the home area of UE2
  • the response message corresponding to the message the I-CSCF device/S-CSCF device in the home area of UE2 sends the response message corresponding to the invite message to the I-CSCF device/S-CSCF device in the home area of UE1, in the home area of UE1
  • the I-CSCF device/S-CSCF device sends, according to the first indication information, a response message corresponding to the invite message, the first indication information and the third indication information to the I-CSCF device/S-CSCF device in the roaming area of UE1.
  • the I-CSCF device/S-CSCF device in the roaming area of UE1 receives the response message corresponding to the invite message, the first indication information and the third indication information, and returns the response message corresponding to the invite message to the invite user according to the first indication information.
  • the device sends a response message corresponding to the invite message, the first indication information and the third indication information to the AS1 in the roaming area of the UE1.
  • AS1 in the roaming area of UE1 determines, according to the service priority processing policy and the third indication information, that the home AS is given priority to provide the call value-added service, and the roaming service processing flow is not triggered.
  • the P-CSCF device in the roaming area can route the invite message initiated by UE1 to the IMS network in the roaming area of UE1, and the AS in the roaming area determines whether Provide call value-added services for UE1.
  • the third indication information allocated by the home AS is sent during the process of returning the response message corresponding to the invite message to UE1. To the AS in the roaming area, so that the AS in the roaming area will not trigger the service processing flow of the roaming area after determining that the home AS will preferentially provide the call value-added service according to the third indication information and the service priority processing policy.
  • each node such as a key management network element
  • each node includes corresponding hardware structures and/or software modules for performing each function.
  • the methods of the embodiments of the present application can be implemented in hardware, software, or a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.
  • the key management network element can be divided into functional modules according to the above method examples.
  • each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.
  • FIG. 10 shows a structural diagram of an apparatus 100
  • the apparatus 100 may be a first CSCF device, a chip in the first CSCF device, a system-on-chip, or other devices capable of implementing the functions of the first CSCF device in the above method, etc.
  • the apparatus 100 may be configured to perform the function of the first CSCF device involved in the foregoing method embodiments.
  • the apparatus 100 shown in FIG. 10 includes: a receiving unit 1001 and a processing unit 1002;
  • the receiving unit 1001 is configured to receive a first communication message, where the first communication message includes a first call signaling, and the originator or the receiver of the first call signaling is a flood-in user equipment of the first CSCF device.
  • the receiving unit 1001 can be used to support the apparatus 100 to perform S401, S802, and S902.
  • the processing unit 1002 is configured to route the first call signaling to the roaming place AS of the roaming user equipment based on the first communication message, where the roaming place AS is in the home area of the first CSCF device and is capable of providing call value-added services for the user equipment.
  • Ability AS the processing unit 1002 may be used to support the apparatus 100 to perform S402, S802-S804, and S902-S904.
  • the apparatus 100 is configured to perform the function of the first CSCF device in the calling method shown in the methods shown in FIG. 4 to FIG. 9 , so the same effect as the calling method described above can be achieved.
  • the apparatus 100 may also be presented in the form of dividing each functional module in an integrated manner.
  • "Functional modules" herein may refer to application specific integrated circuits (ASICs), circuits, processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • FIG. 11 shows a structural diagram of an apparatus 110, and the apparatus 110 may be a second CSCF device, a chip in the second CSCF device, a system-on-chip, or other devices capable of implementing the functions of the second CSCF device in the above method, etc.,
  • the apparatus 110 may be configured to perform the function of the second CSCF device involved in the foregoing method embodiments.
  • the apparatus 110 shown in FIG. 11 includes: a receiving unit 1101 and a processing unit 1102;
  • the receiving unit 110 is configured to receive a second communication message from the first CSCF device, where the second communication message includes the first call signaling, and the originator or the receiver of the first call signaling is the intrusion user equipment of the first CSCF device .
  • the receiving unit 1001 is configured to support the apparatus 110 to execute S402(c), S805, and S905.
  • the processing unit 1102 is configured to route the first call signaling to the roaming place AS of the inbound user equipment based on the second communication message.
  • Ability AS For example, the processing unit 1102 is configured to support the apparatus 110 to execute S402(c), S805, and S905.
  • the apparatus 110 is configured to execute the function of the second CSCF device in the calling method shown in the methods shown in FIG. 4 to FIG. 9 , so the same effect as the above-mentioned calling method can be achieved.
  • the apparatus 110 may also be presented in the form of dividing each functional module in an integrated manner.
  • "Functional modules" herein may refer to application specific integrated circuits (ASICs), circuits, processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • FIG. 12 shows a structural diagram of a device 120.
  • the device 120 may be a roaming AS, a chip in the roaming AS, a system-on-chip, or other devices capable of implementing the functions of the roaming AS in the above method.
  • the device 120 It can be used to execute the functions of the roaming AS involved in the above method embodiments.
  • the apparatus 120 shown in FIG. 12 includes: a receiving unit 1201 and a processing unit 1202;
  • a receiving unit 1201, configured to receive a second communication message from a first call session control function CSCF device or a second CSCF device; the second communication message includes first call signaling, and the originator or receiver of the first call signaling is Flood-in user equipment of the first CSCF device or the second CSCF device.
  • the receiving unit 1201 may support the apparatus 120 to perform S403 and S806.
  • the processing unit 1202 provides a call value-added service for the intruding user equipment based on the second communication message.
  • the processing unit 1202 may support the apparatus 120 to perform S403 and S806.
  • the device 120 is configured to perform the function of the roaming AS in the calling methods shown in the methods shown in FIG. 4 to FIG. 9 , and thus can achieve the same effect as the above calling methods.
  • the apparatus 120 may also be presented in the form of dividing each functional module in an integrated manner.
  • "Functional modules" herein may refer to application specific integrated circuits (ASICs), circuits, processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • FIG. 13 shows a structural diagram of a device 130.
  • the device 130 may be a home AS, a chip in the home AS, a system-on-chip, or other devices capable of implementing the functions of the home AS in the above method.
  • the device 130 It can be used to execute the functions of the home AS involved in the above method embodiments.
  • the apparatus 130 shown in FIG. 13 includes: a receiving unit 1301 and a processing unit 1302;
  • the receiving unit 1301 is configured to receive the seventh communication message from the third call session control function CSCF device; the seventh communication message includes the first call signaling, and the initiator or the receiver of the first call signaling is the third CSCF device.
  • Home user equipment for example, the receiving unit 1301 is configured to support the apparatus 130 to perform S506, S810, and S910.
  • the processing unit 1302 is configured to route the first call signaling or the second call signaling of the call service corresponding to the first call signaling to the first AS based on the seventh communication message, where the first AS is the roaming area of the home user equipment AS.
  • the processing unit 1302 is configured to support the apparatus 130 to execute S506, S810, and S910.
  • the device 130 is configured to perform the function of the home AS in the calling methods shown in the methods shown in FIG. 4-FIG. 9, and thus can achieve the same effect as the above-mentioned calling methods.
  • the apparatus 130 may also be presented in the form of dividing each functional module in an integrated manner.
  • "Functional modules” herein may refer to application specific integrated circuits (ASICs), circuits, processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • ASICs application specific integrated circuits
  • processors and memory executing one or more software or firmware programs, integrated logic circuits, and/or other functions that can provide the above-mentioned functions. device.
  • FIG. 14 is a schematic diagram of the composition of an apparatus 140 according to an embodiment of the present application.
  • the apparatus 140 may be a first CSCF device, a second CSCF device, a roaming AS and a home AS, or a first CSCF device and a second CSCF device , a chip in the roaming AS and the home AS, a system-on-chip or other devices capable of implementing the functions of the first CSCF device, the second CSCF device, the roaming AS and the home AS in the above method.
  • FIG. 14 is a schematic diagram of the composition of an apparatus 140 according to an embodiment of the present application.
  • the apparatus 140 may be a first CSCF device, a second CSCF device, a roaming AS and a home AS, or a first CSCF device and a second CSCF device , a chip in the roaming AS and the home AS, a system-on-chip or other devices capable of implementing the functions of the first CSCF device, the second CSCF device
  • the apparatus 140 may include a processor 1401 , a communication line 1402 and a communication interface 1403 . Further, the apparatus 140 may also include a memory 1404 . The processor 1401 , the memory 1404 and the communication interface 1403 may be connected through a communication line 1402 . The processor 1401 may integrate the functions of the processing unit 1002, the processing unit 1102, the processing unit 1202, and the processing unit 1302 described above. The communication interface 1403 may integrate the functions of the receiving unit 1001 , the receiving unit 1101 , the receiving unit 1201 , and the receiving unit 1301 described above.
  • the processor 1401 may be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, or a microcontroller , programmable logic device (PLD) or any combination of them.
  • the processor 1401 may also be other apparatuses having processing functions, such as circuits, devices or software modules, which are not limited.
  • a communication line 1402 is used to transfer information between the various components included in the device 140 .
  • the communication interface 1403 is used to communicate with other devices or other communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.).
  • Communication interface 1403 may be a module, circuit, transceiver, network interface, or any device capable of enabling communication.
  • Memory 1404 for storing instructions.
  • the instructions may be computer programs.
  • the memory 1404 may be a read-only memory (ROM) or other types of static storage devices that can store static information and/or instructions, or a random access memory (RAM) or a Other types of dynamic storage devices that store information and/or instructions, and may also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD- ROM) or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs), magnetic disk storage media, and other magnetic storage devices, without limitation.
  • ROM read-only memory
  • RAM random access memory
  • EEPROM electrically erasable programmable read-only memory
  • CD- ROM compact disc read-only memory
  • optical disc storage including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs
  • magnetic disk storage media and other magnetic storage devices, without limitation.
  • the memory 1404 may exist independently of the processor 1401 or may be integrated with the processor 1401 .
  • the memory 1404 may be used to store instructions or program code or some data or the like.
  • the memory 1404 may be located inside the device 140 or outside the device 140, which is not limited.
  • the processor 1401 is configured to execute the instructions stored in the memory 1404 to implement the calling method provided by the following embodiments of the present application.
  • the processor 1401 may include one or more CPUs, and as an optional implementation manner, the apparatus 140 includes multiple processors.
  • the apparatus 140 further includes an output device 1405 and an input device 1406 .
  • the input device 1406 is a device such as a keyboard, a mouse, a microphone or a joystick
  • the output device 1405 is a device such as a display screen, a speaker, and the like.
  • the apparatus 140 may be a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device with a similar structure in FIG. 14 .
  • the composition shown in FIG. 14 does not constitute a limitation on the communication device.
  • the communication device may include more or less components than those shown in the figure, or combine some components , or a different component arrangement.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • Embodiments of the present application also provide a computer-readable storage medium. All or part of the processes in the above method embodiments can be completed by instructing the relevant hardware by a computer program, the program can be stored in the above computer-readable storage medium, and when the program is executed, it can include the processes in the above method embodiments.
  • the computer-readable storage medium may be the terminal device of any of the foregoing embodiments, such as: an internal storage unit including a data sending end and/or a data receiving end, such as a hard disk or a memory of the terminal device.
  • the above-mentioned computer-readable storage medium can also be an external storage device of the above-mentioned terminal device, such as a plug-in hard disk equipped on the above-mentioned terminal device, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, Flash card (flash card), etc. Further, the above-mentioned computer-readable storage medium may also include both an internal storage unit of the above-mentioned terminal device and an external storage device.
  • the above-mentioned computer-readable storage medium is used for storing the above-mentioned computer program and other programs and data required by the above-mentioned terminal device.
  • the above-mentioned computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.
  • the embodiments of the present application also provide a computer instruction. All or part of the processes in the foregoing method embodiments may be completed by computer instructions to instruct relevant hardware (such as computers, processors, network devices, and terminals, etc.).
  • the program can be stored in the above-mentioned computer-readable storage medium.
  • connection in the embodiments of the present application, refers to various connection modes such as direct connection or indirect connection, so as to realize communication between devices, which is not limited in the embodiments of the present application.
  • At least one (a) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple .
  • words such as “first” and “second” are used to distinguish the same or similar items with basically the same function and effect. Those skilled in the art can understand that the words “first”, “second” and the like do not limit the quantity and execution order, and the words “first”, “second” and the like are not necessarily different.
  • words such as “exemplary” or “for example” are used to represent examples, illustrations or illustrations. Any embodiments or designs described in the embodiments of the present application as “exemplary” or “such as” should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as “exemplary” or “such as” is intended to present the related concepts in a specific manner to facilitate understanding.
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are only illustrative.
  • the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be Incorporation may either be integrated into another device, or some features may be omitted, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place, or may be distributed to multiple different places . Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a readable storage medium.
  • the technical solutions of the embodiments of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, which are stored in a storage medium , including several instructions to make a device, such as a single chip microcomputer, a chip, etc., or a processor (processor) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk and other mediums that can store program codes.

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Abstract

一种呼叫方法包括：第一CSCF设备接收包含第一呼叫信令的第一通信消息，该第一呼叫信令的发起方/主叫方或者接收方/被叫方为第一CSCF设备的漫入用户设备，第一CSCF设备基于第一通信消息使第一呼叫信令被路由到漫入用户设备的漫游地AS，漫游地AS为第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS。该方法可以提高漫游地AS的资源利用率，提高漫游用户的业务体验。

Description

呼叫方法、装置及系统
本申请要求于2020年9月30日提交中国国家知识产权局、申请号为202011066366.0、申请名称为“呼叫方法、装置及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信技术领域，尤其涉及呼叫方法、装置及系统。
背景技术
在因特网协议(internet protocol，IP)多媒体子系统(IP multimedia subsystem，IMS)网络中，用户设备可能从自己的归属区域移动到其他区域，该其他区域可以称为漫游区域，如果用户设备在漫游区域发起呼叫信令，则漫游区域中接收相关呼叫消息的会话控制功能设备得把呼叫消息路由到用户设备的归属区域，以触发归属区域中的应用服务器(application server，AS)为用户设备提供呼叫增值业务，如彩铃业务、广告视频业务、短信业务等，然后再把呼叫消息路由到被叫用户设备。
如此导致处于漫游状态的用户设备与归属地AS之间的端到端时延较大，降低了呼叫增值业务的用户体验，例如在看彩铃广告过程可能会出现卡顿的现象。
发明内容
本申请实施例提供一种呼叫方法、装置及系统，以解决漫游到归属地之外的用户设备与用户设备的归属地AS之间的端到端时延较大，以及AS的网络资源利用率较低的问题。
为达到上述目的，本申请实施例采用如下技术方案：
第一方面，本申请实施例提供了一种呼叫方法，该呼叫方法应用于第一呼叫会话控制功能CSCF设备，该方法包括：接收包含第一呼叫信令的第一通信消息，第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备，基于第一通信消息使第一呼叫信令被路由到漫入用户设备的漫游地AS，该漫游地AS为第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS，以使得漫游地AS为漫入用户设备提供呼叫增值业务。
基于第一方面所述的方法，在主叫方或者被叫方为第一CSCF设备的漫入用户设备的情况下，使呼叫信令被路由到漫入用户设备的漫游地AS，由漫入用户设备的漫游地AS为漫入用户设备提供呼叫增值业务。由于漫游到用户设备的归属区域之外的用户设备与其漫游地AS距离较近，由漫入用户设备的漫游地AS为该用户设备提供呼叫增值业务，漫入用户设备与漫入用户设备的漫游地AS距离较近，漫入用户设备与漫入用户设备的漫游地AS之间的端到端时延较低，提高用户体验。同时，本申请实施例提供的呼叫方法中，应用服务器不仅可以为本地主叫方提供呼叫增值业务，而且可以为漫游到归属区域中的漫入用户设备提供呼叫增值业务，增加AS为主叫方提供服务的机会，提高网络资源利用率。
一种可能的设计中，基于第一通信消息使第一呼叫信令被路由到漫入用户设备的漫游地 应用服务器AS，包括：基于第一通信消息确定第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备，响应于第一通信消息，使第一呼叫信令被路由到漫游地AS。
基于该可能的设计，可以使呼叫信令被路由到漫游地AS，触发漫游地的AS为漫入用户设备提供呼叫增值业务，由于用户设备与漫游地AS之间的距离较近，用户设备与漫游地AS之间的端到端时延较低，可以提高用户体验，同时提高AS网络资源利用率。
一种可能的设计中，使第一呼叫信令被路由到漫游地AS，包括：向第一CSCF设备的归属区域中的第二CSCF设备或漫游地AS发送第二通信消息，第二通信消息包含第一呼叫信令和第一指示信息，第一指示信息指示第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备。
基于该可能的设计，第一CSCF设备可以直接向漫游地AS发送第二通信消息，也可以通过第二CSCF设备向漫游地AS发送第二通信消息，有效且灵活地设计第二通信消息的发送方式，同时简化系统设计。
一种可能的设计中，第一指示信息还指示使第一呼叫信令或者第一呼叫信令对应的呼叫业务的第二呼叫信令被路由到漫入用户设备的漫游地AS。
基于该可能的设计，赋予第一指示信息具备指示将呼叫信令路由到漫游地AS的功能，呼叫信令传输路线上的设备根据第一指示信息将呼叫信令路由到漫游地AS，简化系统设计。
一种可能的设计中，所述方法还包括：将第一指示信息与第一呼叫信令对应的呼叫业务或通信会话对应存储。
基于该可能的设计，可以对应存储第一指示信息与第一呼叫信令对应的呼叫业务或通信会话，以便呼叫信令传输路线上的设备再次接收到呼叫信令后，根据该对应关系中的第一指示信息将呼叫信令按照本申请实施例设计的呼叫路线路由到漫游地AS，触发漫游地AS提供呼叫增值业务。
一种可能的设计中，第二通信消息中还包含第二CSCF设备的地址信息，以使第二通信消息被路由到第二CSCF设备。
基于该可能的设计，可以根据第二CSCF设备的地址信息，通过第二CSCF设备将携带呼叫信令的通信消息路由到漫游地AS，简化系统设计。
一种可能的设计中，基于第一通信消息确定第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备，包括：基于第一通信消息中的来自(from)头域或PAI头域，确定第一呼叫信令的发起方为第一CSCF设备的漫入用户设备；或者，基于第一通信消息中的to头域，确定第一呼叫信令的接收方为第一CSCF设备的漫入用户设备。
基于该可能的设计，可以根据通信消息的头域中携带的信息确定呼叫信令的发起方或者接收方为漫入用户设备，简化系统设计。
一种可能的设计中，所述方法还包括：接收漫游地AS发送的第三通信消息，第三通信消息包含第一呼叫信令、第一指示信息和第二指示信息，第二指示信息用于指示漫游地AS将为漫入用户设备提供呼叫增值业务；或者，第二指示信息用于指示漫游地AS已经为漫入用户设备提供呼叫增值业务；向漫入用户设备的归属区域的第三CSCF设备发送第四通信消息，第四通信消息包含第一呼叫信令、第一指示信息和第二指示信息。
基于该可能的设计，可以将漫游地AS发出的通信消息路由到漫入用户设备的归属区域，如理由到归属区域中的归属地AS，以使得归属地AS根据通信消息中携带的内容进行业务 冲突处理，以避免归属地AS和漫游地AS同时为漫入用户设备提供呼叫增值业务带来的业务冲突的问题。
一种可能的设计中，所述方法还包括：从漫入用户设备的归属区域中的第三CSCF设备接收第五通信消息，第五通信消息包含第一指示信息和第三指示信息，三指示信息用于指示漫入用户设备的归属地AS将为漫入用户设备提供呼叫增值业务；根据第一指示信息，向漫游地AS发送第六通信消息，第六消息包括第一指示信息以及第三指示信息。
基于该可能的设计，可以将归属地AS发出的通信消息路由回漫入用户设备的漫游区域中的漫游地AS，以使得漫游地AS根据通信消息中携带的内容进行业务冲突处理，以避免归属地AS和漫游地AS同时为漫入用户设备提供呼叫增值业务带来的业务冲突的问题。
一种可能的设计中，所述方法还包括：从漫入用户设备的归属区域中的第三CSCF设备接收第五通信消息，第五通信消息包含第一指示信息和第二指示信息；根据第一指示信息，向漫游地AS发送第六通信消息，第六消息包括第一指示信息以及第二指示信息。
基于该可能的设计，可以将归属地AS发出的通信消息路由回漫入用户设备的漫游区域中的漫游地AS，以使得漫游地AS进行业务冲突处理，避免归属地AS和漫游地AS同时为漫入用户设备提供呼叫增值业务带来的业务冲突的问题。
一种可能的设计中，在基于第一通信消息使第一呼叫信令被路由到漫游地AS之前，所述方法还包括：确定漫入用户设备具备使用第一CSCF设备的归属区域中的AS提供的呼叫增值业务的能力。
基于该可能的设计，可以在将呼叫信令路由到漫游地AS之外，确定漫入用户设备是否支持使用第一CSCF设备的归属区域中的AS提供的呼叫增值业务的能力，在具备这样的能力的情况下，才使呼叫信令被漫游到AS，触发漫游地AS提供呼叫增值业务，避免因用户设备不具备支持漫游地AS提供的呼叫增值业务的能力导致的无法呈现呼叫增值业务的问题。
一种可能的设计中，第一CSCF设备的归属区域中的第二CSCF设备为第一CSCF设备的归属区域中的查询-呼叫会话功能I-CSCF设备或者服务-呼叫会话控制功能S-CSCF设备。第一CSCF设备为代理-呼叫会话控制功能P-CSCF设备。
基于该可能的设计，有效且灵活地设计实现本申请实施例的呼叫方法的设备。
第二方面，本申请实施例提供了一种呼叫方法，应用于第二呼叫会话控制功能CSCF设备，所述方法包括：接收来自第一呼叫会话控制功能CSCF设备的第二通信消息，第二通信消息包含第一呼叫信令，第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备；基于第二通信消息使第一呼叫信令被路由到漫入用户设备的漫游地应用服务器AS，漫游地AS为第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS。
基于第二方面所述的方法，使呼叫信令被路由到漫入用户设备的漫游地AS，由漫入用户设备的漫游地AS为漫入用户设备提供呼叫增值业务。由于漫游到用户设备的归属区域之外的用户设备与其漫游地AS距离较近，由漫入用户设备的漫游地AS为该用户设备提供呼叫增值业务，由于用户设备与漫游地AS之间的距离较近，用户设备与其漫游地AS之间的端到端时延较低，可以提高用户体验。同时，应用服务器不仅可以为本地主叫方提供呼叫增值业务，而且可以为漫游到归属区域中的漫入用户设备提供呼叫增值业务，增加AS为主叫方提供服务的机会，提高网络资源利用率。
一种可能的设计中，第二通信消息还包含第一指示信息，第一指示信息用于指示第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备；基于第二通信消息使第一呼叫信令被路由到漫入用户设备的漫游地应用服务器AS，包括：根据第一指示信息，向漫游地AS发送第二通信消息。
一种可能的设计中，第一指示信息还指示使第一呼叫信令或者第一呼叫信令对应的呼叫业务的第二呼叫信令被路由到漫入用户设备的漫游地AS。
一种可能的设计中，所述方法还包括：将第一指示信息与第一呼叫信令对应的呼叫业务或通信会话对应存储。
一种可能的设计中，第二通信消息还包含第二CSCF设备的地址信息，以使得第二通信消息被路由到第二CSCF设备。
一种可能的设计中，所述方法还包括：接收漫游地AS发送的第三通信消息，第三通信消息包含第一呼叫信令、第一指示信息和第二指示信息，第二指示信息用于指示漫游地AS将为漫入用户设备提供呼叫增值业务，或者，第二指示信息用于指示漫游地AS已经为漫入用户设备提供呼叫增值业务；向漫入用户设备的归属区域中的第三CSCF设备发送第四通信消息，第四通信消息包含第一呼叫信令、第一指示信息和第二指示信息。
一种可能的设计中，所述方法还包括：从漫入用户设备的归属区域中的第三CSCF设备接收第五通信消息，第五通信消息包含第一指示信息和第三指示信息，三指示信息用于指示漫入用户设备的归属地AS将为漫入用户设备提供呼叫增值业务；根据第一指示信息，向漫游地AS发送第六通信消息，第六消息包括第一指示信息以及第三指示信息。
一种可能的设计中，所述方法还包括：从漫入用户设备的归属区域中的第三CSCF设备接收第五通信消息，第五通信消息包含第一指示信息和第二指示信息，根据第一指示信息，向漫游地AS发送第六通信消息，第六消息包括第一指示信息以及第二指示信息。
一种可能的设计中，第二CSCF设备为第一CSCF设备的归属区域中的查询-呼叫会话功能I-CSCF设备或第二CSCF设备的归属区域中的服务-呼叫会话控制功能S-CSCF设备。
其中，第一指示信息、第二通信消息、第二CSCF设备的相关描述可参照第一方面或第一方面的可能的设计中所述，不予赘述。
第三方面，本申请实施例提供了一种呼叫方法，应用于第一AS，所述方法包括：接收来自第一呼叫会话控制功能CSCF设备或者第二CSCF设备的第二通信消息；第二通信消息包含第一呼叫信令，第一呼叫信令的发起方或者接收方为第一CSCF设备或第二CSCF设备的漫入用户设备；基于第二通信消息为漫入用户设备提供呼叫增值业务。
基于第三方面所述的方法，由漫入用户设备的漫游地AS为漫入用户设备提供呼叫增值业务。由于漫游到用户设备的归属区域之外的用户设备与其漫游地AS距离较近，由漫入用户设备的漫游地AS为该用户设备提供呼叫增值业务，由于漫入用户设备与漫游地AS之间的距离较近，漫入用户设备与其漫游地AS之间的端到端时延较低，可以提高用户体验。同时，本申请实施例提供的呼叫方法中，应用服务器不仅可以为本地主叫方提供呼叫增值业务，而且可以为漫游到归属区域中的漫入用户设备提供呼叫增值业务，增加AS为主叫方提供服务的机会，提高网络资源利用率。
一种可能的设计中，第二通信消息还包含第一指示信息，第一指示信息用于指示第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备。
一种可能的设计中，第一指示信息还指示使第一呼叫信令或者第一呼叫信令对应的呼叫业务的第二呼叫信令被路由到第一AS。
一种可能的设计中，所述方法还包括：将第一指示信息与第一呼叫信令对应的呼叫业务或通信会话对应存储。
一种可能的设计中，基于第二通信消息为漫入用户设备提供呼叫增值业务，包括：响应于第二通信消息，为漫入用户设备提供呼叫增值业务；向第二CSCF设备发送第三通信消息，第三通信消息包含第一呼叫信令、第一指示信息和第二指示信息，第二指示信息指示第一AS已经为漫入用户设备提供呼叫增值业务。
一种可能的设计中，基于第二通信消息漫入用户设备提供呼叫增值业务，包括：响应于第二通信消息，向第二CSCF设备发送第三通信消息，第三通信消息包含第一呼叫信令、第一指示信息和第二指示信息，第二指示信息指示第一AS将为漫入用户设备提供呼叫增值业务；从第二CSCF设备接收第六通信消息，第六通信消息包含第一呼叫信令、第一指示信息和第三指示信息，第三指示信息指示漫入用户设备的归属地AS将为漫入用户设备提供呼叫增值业务；响应于第六通信消息，向漫入用户设备提供呼叫增值业务。
其中，第一指示信息、第二通信消息、第二CSCF设备、第三通信消息、第四通信消息、第五通信消息、第六通信消息的相关描述可参照第一方面或第一方面的可能的设计中所述，不予赘述。
第四方面，本申请实施例提供了一种呼叫方法，应用于第二AS，所述方法包括：接收来自第三呼叫会话控制功能CSCF设备的第七通信消息；第七通信消息包含第一呼叫信令，第一呼叫信令的发起方或者接收方为第三CSCF设备的归属用户设备；基于第七通信消息使第一呼叫信令或者第一呼叫信令对应的呼叫业务的第二呼叫信令被路由至第一AS，第一AS为归属用户设备的漫游区域的AS。
基于第四方面所述的方法，由归属地AS将呼叫信令路由到漫游地AS，由漫游地AS为漫入用户设备提供呼叫增值业务。由于漫游到用户设备的归属区域之外的用户设备与其漫游地AS距离较近，由漫入用户设备的漫游地AS为该用户设备提供呼叫增值业务，由于漫入用户设备与漫游地AS之间的距离较近，漫入用户设备与其漫游地AS之间的端到端时延较低，提高用户体验。同时，本申请实施例提供的呼叫方法中，应用服务器不仅可以为本地主叫方提供呼叫增值业务，而且可以为漫游到归属区域中的漫入用户设备提供呼叫增值业务，增加AS为主叫方提供服务的机会，提高网络资源利用率。
一种可能的设计中，第七通信消息还包含第一指示信息，第一指示信息用于指示第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备，第一CSCF设备为归属用户设备的漫游区域中的CSCF设备。
一种可能的设计中，第一指示信息还指示使第一呼叫信令或者第一呼叫信令对应的呼叫业务的第二呼叫信令被路由到归属用户设备的漫游地AS。
一种可能的设计中，所述方法还包括：将第一指示信息与第一呼叫信令对应的呼叫业务或通信会话对应存储。
一种可能的设计中，基于第七通信消息使第一呼叫信令被路由至第一AS，包括：响应于第七通信消息，向第三CSCF设备发送第八通信消息，包含第一呼叫信令、第一指示信息和第三指示信息，第三指示信息指示第二AS将为漫入用户设备提供呼叫增值业务。
一种可能的设计中，基于第七通信消息使第一呼叫信令被路由至第一AS，包括：响应于第七通信消息，向第三CSCF设备发送第八通信消息，包含第一呼叫信令、第一指示信息。
其中，第一指示信息、第二通信消息的相关描述可参照第一方面或第一方面的可能的设计中所述，不予赘述。
第五方面，本申请提供一种通信装置，该通信装置可以为实现上述第一方面或者第一方面的任一可能的设计的功能模块或者物理实体，或者，实现上述第二方面或者第二方面的任一可能的设计的功能模块或者物理实体，或者，实现上述第三方面或者第三方面的任一可能的设计的功能模块或者物理实体，或者实现上述第四方面或者第四方面的任一可能的设计的功能模块或者物理实体。所述通信装置可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个上述功能相应的模块。一种设计中，该通信装置可以包括执行第一方面中所描述的方法/操作/步骤/动作所一一对应的模块、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块或单元。如该通信装置可以包括：接收单元、处理单元。
第一种可能的设计中，该通信装置可以为实现上述第一方面或者第一方面的任一可能的设计的功能模块或者物理实体，接收单元，用于接收包含第一呼叫信令的第一通信消息，第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备。处理单元，用于基于第一通信消息使第一呼叫信令被路由到漫入用户设备的漫游地AS，该漫游地AS为第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS，以使得漫游地AS为漫入用户设备提供呼叫增值业务。
其中，第一指示信息、第二通信消息的相关描述可参照第一方面或第一方面的可能的设计中所述，不予赘述。
其中，该通信装置的具体实现方式可以参考第一方面或第一方面的任一可能的设计提供的呼叫方法中第一CSCF设备的行为功能，在此不再重复赘述。因此，该提供的通信装置可以达到与第一方面或者第一方面的任一可能的设计相同的有益效果。
第二种可能的设计中，该通信装置可以为实现上述第二方面或者第二方面的任一可能的设计的功能模块或者物理实体，接收单元，用于接收来自第一呼叫会话控制功能CSCF设备的第二通信消息，第二通信消息包含第一呼叫信令，第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备；处理单元，用于基于第二通信消息使第一呼叫信令被路由到漫入用户设备的漫游地应用服务器AS，漫游地AS为第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS。
其中，第一指示信息、第二通信消息的相关描述可参照第一方面或第一方面的可能的设计中所述，不予赘述。
其中，该通信装置的具体实现方式可以参考第二方面或第二方面的任一可能的设计提供的呼叫方法中第二CSCF设备的行为功能，在此不再重复赘述。因此，该提供的通信装置可以达到与第二方面或者第二方面的任一可能的设计相同的有益效果。
第三种可能的设计中，该通信装置可以为实现上述第三方面或者第三方面的任一可能的设计的功能模块或者物理实体，接收单元，用于接收来自第一呼叫会话控制功能CSCF设备或者第二CSCF设备的第二通信消息；第二通信消息包含第一呼叫信令，第一呼叫信令的发 起方或者接收方为第一CSCF设备或第二CSCF设备的漫入用户设备；处理单元，用于基于第二通信消息为漫入用户设备提供呼叫增值业务。
其中，第一指示信息、第二通信消息的相关描述可参照第一方面或第一方面的可能的设计中所述，不予赘述。
其中，该通信装置的具体实现方式可以参考第三方面或第三方面的任一可能的设计提供的呼叫方法中第一AS的行为功能，在此不再重复赘述。因此，该提供的通信装置可以达到与第三方面或者第三方面的任一可能的设计相同的有益效果。
第四种可能的设计中，该通信装置可以为实现上述第四方面或者第四方面的任一可能的设计的功能模块或者物理实体，接收单元，用于接收来自第三呼叫会话控制功能CSCF设备的第七通信消息；第七通信消息包含第一呼叫信令，第一呼叫信令的发起方或者接收方为第三CSCF设备的归属用户设备；处理单元，用于基于第七通信消息使第一呼叫信令或者第一呼叫信令对应的呼叫业务的第二呼叫信令被路由至第一AS，第一AS为归属用户设备的漫游区域的AS。
其中，第一指示信息、第二通信消息的相关描述可参照第一方面或第一方面的可能的设计中所述，不予赘述。
其中，该通信装置的具体实现方式可以参考第四方面或第四方面的任一可能的设计提供的呼叫方法中第二AS的行为功能，在此不再重复赘述。因此，该提供的通信装置可以达到与第四方面或者第四方面的任一可能的设计相同的有益效果。
第六方面，提供了一种通信装置，该通信装置可以为第一CSCF设备或者第一CSCF设备中的芯片或者片上系统，或者为其他能够实现第一CSCF设备侧方法的模块或者单元。该通信装置可以实现上述第一方面或者各可能的设计中第一CSCF设备所执行的功能，所述功能可以通过硬件实现。一种可能的设计中，该通信装置可以包括：处理器和通信接口，处理器用于通过通信接口接收包含第一呼叫信令的第一通信消息，第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备，基于第一通信消息使第一呼叫信令被路由到漫入用户设备的漫游地AS，该漫游地AS为第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS，以使得漫游地AS为漫入用户设备提供呼叫增值业务。
又一种可能的设计中，第六方面所述的通信装置可以为第二CSCF设备或者第二CSCF设备中的芯片或者片上系统，还可以为第二CSCF设备中用于实现本申请实施例所述的呼叫方法的模块或者单元，或者为其他能够实现第二CSCF设备执行的方法的模块或者单元，如该通信装置可以包括：处理器和通信接口。该通信装置包括的处理器以及通信接口用于支持该通信装置实现上述第二方面或者第二方面的各可能的设计中第二CSCF设备所执行的功能。
又一种可能的设计中，第六方面所述的通信装置可以为第一AS或者第一AS中的芯片或者片上系统，还可以为第一AS中用于实现本申请实施例所述的呼叫方法的模块或者单元，或者为其他能够实现第一AS执行的方法的模块或者单元，如该通信装置可以包括：处理器和通信接口。该通信装置包括的处理器以及通信接口用于支持该通信装置实现上述第三方面或者第三方面的各可能的设计中第一AS所执行的功能，或者，实现上述第三方面或者第三方面的各可能的设计中第一AS所执行的功能。
又一种可能的设计中，第六方面所述的通信装置可以为第二AS或者第二AS中的芯片 或者片上系统，还可以为第二AS中用于实现本申请实施例所述的呼叫方法的模块或者单元，或者为其他能够实现第二AS执行的方法的模块或者单元，如该通信装置可以包括：处理器和通信接口。该通信装置包括的处理器以及通信接口用于支持该通信装置实现上述第四方面或者第四方面的各可能的设计中第二AS所执行的功能，或者，实现上述第四方面或者第四方面的各可能的设计中第二AS所执行的功能。
在又一种可能的设计中，第六方面通信装置还可以包括存储器，存储器用于保存计算机指令和/或数据。当该通信装置运行时，该处理器执行该存储器保存的该计算机指令，以使该通信装置执行上述第一方面或者第一方面的任一种可能的设计所述的呼叫方法；或者，执行上述第二方面或第二方面的任一种可能的设计所述的呼叫方法；或者，执行上述第三方面或第三方面的任一可能的设计所述的呼叫方法；或者，执行上述第四方面或第四方面的任一可能的设计所述的呼叫方法。在本申请实施例中，通信接口可以是收发器、接口电路、总线接口、管脚或其它能够实现收发功能的装置。
第七方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述第一方面或者上述方面的任一可能的设计所述的呼叫方法；或者，执行上述第二方面或第二方面的任一种可能的设计所述的呼叫方法；或者，执行上述第三方面或第三方面的任一可能的设计所述的呼叫方法；或者，执行上述第四方面或第四方面的任一可能的设计所述的呼叫方法。
第八方面，提供了一种包含指令的计算机程序产品，该计算机程序产品可以包括程序指令，当该计算机程序产品在计算机上运行时，使得计算机可以执行上述第一方面或者上述方面的任一可能的设计所述的呼叫方法；或者，执行上述第二方面或第二方面的任一种可能的设计所述的呼叫方法；或者，执行上述第三方面或第三方面的任一可能的设计所述的呼叫方法；或者，执行上述第四方面或第四方面的任一可能的设计所述的呼叫方法。
第九方面，提供了一种芯片系统，该芯片系统包括处理器以及通信接口，该芯片系统可以用于实现上述第一方面或第一方面的任一可能的设计中第一CSCF设备所执行的功能，或者，该芯片系统可以实现上述第二方面或者第二方面的各可能的设计中第二CSCF设备所执行的功能，或者，实现上述第三方面或者第三方面的各可能的设计中第一AS所执行的功能，或者，实现上述第四方面或者第四方面的各可能的设计中第二AS所执行的功能。
第十方面，本申请实施例还提供一种通信系统，所述通信系统包括如第五方面或第六方面所述的通信装置。
附图说明
图1a为漫游用户接入归属区域的IMS网络的示意图一；
图1b为漫游用户接入归属区域的IMS网络的示意图二；
图2为漫游用户使用归属区域呼叫增值业务的示意图；
图3为本申请实施例提供的一种通信网络架构示意图；
图4为本申请实施例提供的呼叫方法的流程图一；
图5为本申请实施例提供的呼叫方法的流程图二；
图6为本申请实施例中主叫方使用漫游区域的呼叫增值业务的流程图；
图7为本申请实施例中被叫方使用漫游区域的呼叫增值业务的流程图；
图8为本申请实施例提供的呼叫方法的流程图三；
图9为本申请实施例提供的呼叫方法的流程图四；
图10为本申请实施例提供的装置100的结构示意图；
图11为本申请实施例提供的装置110的结构示意图；
图12为本申请实施例提供的装置120的结构示意图；
图13为本申请实施例提供的装置130的结构示意图；
图14为本申请实施例提供的装置140的结构示意图。
具体实施方式
在介绍本申请实施例之前，对本申请实施例涉及的相关技术术语进行解释说明。需要说明的是，这些解释说明是为了让本申请实施例更容易被理解，而不应该视为对本申请实施例所要求的保护范围的限定。
IMS网络，是一个基于因特网协议(internet protocol，IP)网提供语音及多媒体业务的网络体系架构，能够满足现在的终端客户对更新颖和更多样化多媒体业务的需求。IMS网络具有如下特征：采用会话初始协议(session initiation protocol，SIP)作为呼叫控制协议，基于SIP实现了呼叫控制和业务控制的分离，并增强了多媒体支持能力；通过归属控制，即使用户设备漫游到外地，也可以使用到与归属区域同样的服务。
漫游是指用户设备从自己的注册区域/归属区域移动到注册区域/归属区域之外的其他区域。用户设备的注册区域/归属区域之外的网络区域可以称为用户设备的漫游区域或拜访区域或者漫游地或者拜访地，其中的通信网络称为拜访公共陆地移动网络(public land mobile network，PLMN)(简称VPLMN)。本申请实施例中，用户设备的归属区域可以称为归属地，用户设备的归属区域的通信网络可以称为用户设备的归属公共陆地移动网络(home public land mobile network，HPLMN)(简称HPLMN)。
其中，处于漫游区域的用户设备可以通过图1a所示方式或者图1b所示方式接入用户设备的归属区域的IMS网络，使用归属区域的IMS网络提供的呼叫增值业务。参照图1a所示，漫游区域提供包括数据网关以及边界网关(border gateway，BG)的数据通道，用户设备可以通过数据通道与归属区域的数据网关(如分组数据网络(packet data network，PDN)网关(PDN gateway，P-GW))互通，通过归属区域的数据网关访问归属区域的IMS网络，使用归属区域中的呼叫增值业务。参照图1b所示，漫游区域的代理-呼叫会话控制功能(proxy-call session control function，P-CSCF)设备与归属区域的IMS网络互通，用户设备可以通过漫游区域的P-CSCF设备接入用户设备的归属区域，使用归属区域中的呼叫增值业务。
现有技术中，用户设备在其漫游区域中发起呼叫请求，但发出的呼叫请求可以通过图1a或者图1b所示方式被路由到用户设备的归属区域的IMS网络中，由用户设备的归属区域的IMS网络为用户设备提供呼叫增值业务，无法实现由漫游区域中的IMS为漫入的用户设备提供呼叫增值业务。例如，如图2所示，为用户设备UE1呼叫用户设备UE2的流程示意图，UE1在漫游区域向P-CSCF设备发送invite消息后，漫游区域的P-CSCF设备把invite消息路由到UE1的归属区域的I-CSCF设备/S-CSCF设备，由UE1的归属区域的I-CSCF设备/S-CSCF设备将invite消息路由到UE1的归属区域的IMS网络中，触发UE1的归属区域的AS为UE1提供呼叫增值业务，同时，把invite消息进一步路由到UE2进行呼叫接续。
图2所示的呼叫方式中，漫游到归属区域之外的用户设备UE1只能使用UE1的归属地应用服务器(application servicer，AS)提供的呼叫增值业务。由于漫游到归属区域之外的UE1与UE1的归属地AS距离较远，UE1与归属地AS之间的端到端时延较大，降低用户体验。同时，图2所示的呼叫方式中，UE1的归属地AS只能为本地UE提供呼叫增值业务，而不能为漫游到归属区域中的漫入UE提供呼叫增值业务，减少AS为UE提供服务的机会，降低网络资源利用率。
为解决上述技术问题，本申请实施例提供一种呼叫方法，包括：第一CSCF设备接收包含第一呼叫信令的第一通信消息，该第一呼叫信令的发起方或者呼叫方为第一CSCF设备的漫入用户设备，第一CSCF设备基于第一通信消息使第一呼叫信令被路由到漫入用户设备的漫游地AS，该漫游地AS为第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS。如此，可以由漫入用户设备的漫游地AS为漫入用户设备提供呼叫增值业务，使漫入用户设备使用漫游区域中的呼叫增值业务。由于漫游到归属区域之外的用户设备与用户设备的漫游区域中的漫游地AS距离较近，由用户设备的漫游区域中的漫游地AS为用户设备提供呼叫增值业务，由于漫入用户设备与漫游地AS之间的距离较近，用户设备与漫游地AS之间的端到端时延较低，可以提高用户体验。同时，本申请实施例提供的呼叫方法中，应用服务器不仅可以为本地用户设备提供呼叫增值业务，而且可以为漫游到归属区域中的漫入用户设备提供呼叫增值业务，增加AS为用户设备提供服务的机会，提高网络资源利用率。
本申请实施例中，漫入用户设备可以是一个用户设备，该用户设备是从用户设备的归属区域(如HPLMN)漫游到用户设备的归属区域之外的区域(如另一个PLMN)的用户设备。从用户设备角度，归属区域之外的区域可以称为该用户设备的漫游区域或者拜访区域或者HPLMN或者漫游地，从归属区域之外的区域中设备(如P-CSCF设备或者AS或分组数据网关(packet gataway，PGW)等)角度，该用户设备可以称为归属区域之外的区域中的设备的漫入用户设备，从用户设备的归属区域(如HPLMN)中的设备角度，该用户设备可以称为“漫出”用户设备。例如，假设UE1的归属区域中为区域1，如果UE1漫游到区域2中，区域2与区域1不同，则从UE1的角度，区域1可以称为UE1的归属区域，区域2可以称为UE1的漫游区域或者漫游地或拜访地，从区域2中的P-CSCF角度，UE1可以称为P-CSCF设备的漫入用户设备。
本申请实施例中，漫游地AS可以指漫入用户设备的漫游区域中的AS，归属地AS可以指漫入用户设备的归属区域中的AS。
本申请实施例中，呼叫增值业务是指在呼叫业务的上下文环境(包括通话前、通话期间或通话后)中，由某个应用服务器向参加该呼叫业务的用户设备(可为主叫、也可以为被叫)在所述呼叫业务之外提供的补充业务；具体地，该补充业务可以由所述用户设备上的呼叫业务应用(Application，APP，例如，电话通讯应用，telephony APP)使用或消费，也可以由与所述用户设备的呼叫业务应用相关联的应用(如外挂应用、嵌套应用等)使用或消费；具体地，该补充业务可以包括但不限于媒体类业务、消息业务；如果该补充业务是媒体类业务，所述应用服务器可以基于呼叫信令，触发所述用户设备上的呼叫业务应用呈现媒体内容，其中，媒体内容可以是游戏内容、彩铃内容、来电显示内容等。如果改补充业务是消息业务，所述应用服务器可以基于呼叫信令，向所述用户设备上发送视频通知、短信通知(如第五代(5th generation，5G)消息)等；
本申请实施例中，媒体内容的格式可以包括但不限于视频内容、音频内容、超文本标记语言(hyper text markup language，HTML)页面、联合图像专家组(joint photographic experts group，JPEG)图片、图像互动格式(graphics interchange format，GIF)动画。如果格式为音频内容，则上述呈现媒体内容是指在用户设备播放音频内容，如果格式为视频内容、HTML页面、JPEG图片、GIF动画等，则上述呈现媒体内容是指在用户设备渲染(render)或显示(display)视频内容、HTML页面、JPEG图片、GIF动画等。
本申请实施例中，呼叫业务可以指用户设备以主叫身份或者被叫身份参与，经通信网络接续与其他呼叫设备(如上述被叫方)之间进行的语音通话业务或视频通话业务，例如，呼叫业务可以为用户设备拨打手机号码、办公座机号码或客服中心号码而进行的语音通话业务或者视频业务，再如，呼叫业务可以为用户设备接收手机、办公座机或客服中心呼叫而进行的语音通话业务或者视频业务。
例如，以UE1呼叫UE2，AS为UE1提供呼叫增值业务为例，可以在UE1拨打UE2的手机号码-呼叫请求到达UE2之时或者之前的阶段由AS触发UE1在呼叫业务相关的APP界面呈现媒体内容、游戏内容等，可以在呼叫请求到达UE2-UE2振铃-UE2摘机的阶段由AS触发UE1在呼叫业务相关的APP界面呈现媒体内容、游戏内容等，还可以在UE2摘机-UE1与UE2双方进入通话的阶段由AS触发UE1在呼叫业务相关的APP界面提供媒体内容、游戏内容等。
下面结合说明书附图对本申请实施例提供的呼叫方法进行描述。
本申请实施例提供的呼叫方法可以应用于图3所示的网络架构，如图3所示，该网络架构可以包括：用户设备(user equipment，UE)、多个IMS网络，多个IMS网络可以包括用户设备注册的IMS网络，每个IMS网络可以包括P-CSCF设备、查询-呼叫会话控制功能(interrogating-call session control function，I-CSCF)设备、服务-呼叫会话控制功能(serving-call session control function，S-CSCF)设备、以及AS，还可以包括接入网设备、会话边界控制器(session border controller，SBC)以及归属用户服务器(home subscriber，HSS)等其他设备，不予限制。例如，图3所示的网络架构包括UE1、UE2、UE3等多个UE、接入网设备10、SBC11、P-CSCF设备12、接入网设备20、P-CSCF设备21、SBC31、IMS网络1、IMS网络2以及IMS网络3，IMS网络1包括I-CSCF设备13、S-CSCF设备14以及AS15，IMS网络2包括I-CSCF设备22、S-CSCF设备23以及AS24，IMS网络3包括I-CSCF设备33、S-CSCF设备34以及AS35。
本申请实施例提供的呼叫方法可以应用于各种通信场景，例如可以应用于以下通信场景中的一种或多种：增强移动宽带(enhanced mobile broadband，eMBB)、超可靠低时延通信(ultra reliable low latency communication，URLLC)、机器类型通信(machine type communication，MTC)、大规模机器类型通信(massive machine type communications，mMTC)、设备到设备(device to device，D2D)、车辆外联(vehicle to everything，V2X)、车辆到车辆(vehicle to vehicle，V2V)、和物联网(internet of things，IoT)等。
其中，本申请实施例中，IMS网络中的P-CSCF设备、I-CSCF设备以及S-CSCF设备可以看成是不同类型的SIP代理或者服务器。P-CSCF设备、I-CSCF设备以及S-CSCF设备可以如图3所示各自独立部署在IMS网络中，还可以P-CSCF设备、I-CSCF设备以及S-CSCF设备合设部署，如不部署独立的I-CSCF设备和S-CSCF设备，而是将I-CSCF设备以及S-CSCF 设备具备的功能集成在P-CSCF中，使P-CSCF设备具备I-CSCF设备及S-CSCF设备的功能。
下面对图3所示架构中的网元进行介绍：
用户设备(user equipment，UE)，可以是终端(terminal，MT)、移动台(mobile station，MS)或者移动终端(mobile terminal，MT)等。具体的，用户设备可以是手机(mobile phone)、平板电脑(tablet)或带无线收发功能的电脑，还可以是虚拟现实(virtual reality，VR)终端、增强现实(augmented reality，AR)终端、工业控制中的无线终端、无人驾驶中的无线终端、远程医疗中的无线终端、智能电网中的无线终端、智慧城市(smart city)中的无线终端、智能家居、或车载终端等。用户设备可以先连接到接入网设备，然后通过分组数据服务节点(packet data serving node，PDSN)接入到IMS网络。
接入网设备，主要用于为用户设备接入IMS网络提供网络服务，实现用户设备的资源调度、无线资源管理、无线接入控制以及中至少一项功能。具体的，接入网设备可以包括基站、无线接入点、收发点(transmission receive point，TRP)、传输点(transmission point，TP)以及某种其它接入节点中的任一节点。
P-CSCF设备，是用户设备接入IMS网络的入口点，负责与用户设备交互。主要用于产生呼叫详细记录(call detail record，CDR)话单、用户漫游计费需求、提供Gm接口上的SIP压缩和完整性保护，将用户设备的请求路由到正确的I-CSCF设备/S-CSCF设备。
I-CSCF设备，主要用于在用户设备注册时，为用户设备分配提供服务的S-CSCF设备，为来话选择被叫注册的S-CSCF设备。
S-CSCF设备，实现对用户设备注册认证、业务触发和控制、会话路由等。
AS，负责处理具体的业务，如为用户设备提供呼叫增值业务等。
SBC，是IMS网络边缘用于实现IP接入、互通和安全保护的网元，存在于接入网络与IMS网络之间或者不同IMS网络之间，是用户接入IMS的入口点。
HSS，是IMS中所有与用户和服务相关的数据的主要数据存储器。存储在HSS中的数据主要包括用户身份、注册信息、接入参数和服务触发信息、用户设备的标识信息、用户安全上下文、用户网络接入认证的密钥信息、漫游限制信息，HSS支持用户的注册，并存储用户的位置信息，用户的业务签约信息。
需要说明的是，图3仅为示例性架构图，除图3中所示功能单元外，该系统还可以包括其他功能网元，如域名系统(domain name system，DNS)服务器等。本申请实施例对此不进行限定。此外，图3中各个设备的名称不受限制，除图2所示名称之外，各个设备还可以命名为其他名称，如替换成具备相同或相似功能的网元名称，不予限制。
可选的，本申请实施例中的P-CSCF设备、I-CSCF设备、S-CSCF设备等也可以称之为通信装置，其可以是一个台式机、便携式电脑、网络服务器、移动手机、平板电脑、无线终端、嵌入式设备、芯片系统等，本申请实施例对此不作具体限定。本申请实施例中，芯片系统可以由芯片构成，也可以包括芯片和其他分立器件。
可选的，本申请实施例中的P-CSCF设备、I-CSCF设备、S-CSCF设备的相关功能可以由一个设备实现，也可以由多个设备共同实现，还可以是由一个设备内的一个或多个功能模块实现，本申请实施例对此不作具体限定。可以理解的是，上述功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行的软件功能，或者是硬件与软件的结合，或者是平台(例如云平台)上实例化的虚拟化功能。
下面结合图3所示网络架构，以用户设备漫游到归属区域之外的区域，用户设备在其归属区域之外的区域中向被叫方发起呼叫为例，对本申请实施例提供的呼叫方法进行描述。需要说明的是，本申请的各实施例之间涉及的动作，术语等均可以相互参考。本申请的实施例中各个网元之间交互的消息名称或消息中的参数名称等只是一个示例，具体实现中也可以采用其他的名称，例如本申请实施例中的“漫游”也可以理解为“拜访”，本申请实施例中的“包括”也可以理解为“携带”等，本申请实施例中的“存储”也可以理解为“记录”或者“保存”等，本申请实施例中的“漫游地AS”可以替换为“第一AS”，归属地AS可以替换为“第二AS”等，漫入用户设备的归属区域中的I-CSCF设备或者S-CSCF设备可以替换为“第三CSCF设备”等，在此统一说明，本申请实施例对此不作具体限定。
图4为本申请实施例提供的一种呼叫方法的流程图，如图4所示，该方法假设用户设备漫游到第一CSCF设备所在区域(或归属区域)，成为第一CSCF设备的漫入用户设备，并且以主叫身份或被叫身份参与呼叫业务，该方法包括如下步骤：
S401：第一CSCF设备接收第一通信消息。
具体地，第一通信消息为主叫方(caller/calling party，也称为发起方，originating party)发起的用于呼叫被叫方(callee/called party,也称为接收方或终接方，terminating party)的通信消息，如SIP消息，也可以称为呼叫消息或者访问消息。第一通信消息包括主叫方发起的第一呼叫信令，该第一呼叫信令可以为SIP Invite信令，该第一呼叫信令可以包括主叫方的信息以及被叫方的信息。第一通信消息还可以包括其他信息，如还可以包括用于指示第一呼叫信令对应的呼叫业务(如语音呼叫业务或者视频呼叫业务)的媒体类型的内容类型(content-Type)头域、用于标识第一呼叫信令所经过的设备的路由相关字段以及消息体，路由相关字段可以包括但不限于经由(via)头域、联系(contact)头域或者记录路由(record-route)/路由(route)头域，消息体可以包括会话描述信息，会话描述信息包括媒体内容堵的信息，如媒体内容的传输方式、编解码方式等。
具体地，主叫方的信息用于指示主叫方或标识第一呼叫信令的发起方，包括主叫方的号码或者主叫方的国际移动用户识别码(internation mobile subscriber identification，IMSI)或第一通信消息的来源地址等，可以携带在第一通信消息的来自(from)头域或者断言身份(P-Asserted-Identity，PAI)头域中。
具体地，被叫方的信息可以用于指示被叫方或标识第一呼叫信令的接收方，包括被叫方的电话号码、IMSI或第一通信消息的目标地址等，可以携带在第一通信消息的to头域中。
具体地，第一CSCF设备可以为图3中的P-CSCF设备12或者P-CSCF设备21或者P-CSCF设备32。第一呼叫信令的主叫方或者被叫方都可能是第一CSCF设备的漫入用户设备。
具体地，第一CSCF设备接收第一通信消息的示例性方法如下：
1)在第一呼叫信令的主叫方是第一CSCF设备的漫入用户设备的情况下，则第一CSCF设备直接或间接从主叫方接收第一通信消息，例如通过主叫方与第一CSCF设备之间的中间网元接收第一通信消息，该中间网元可以为接入网设备、SBC等。以图3为例，假设主叫方为UE1，UE1从接入网设备10的覆盖区域移动到接入网设备20的覆盖区域，如果第一CSCF设备为P-CSCF设备21，则中间网元为接入网设备20，如果第一CSCF设备为P-CSCF设备32，则中间网元为接入网设备20、SBC31。
2)在第一呼叫信令的被叫方是第一CSCF设备的漫入用户设备的情况下，则第一CSCF设备直接或间接从被叫方的归属区域中的第二CSCF设备接收第一通信消息，被叫方的归属区域中的第二CSCF设备可以为被叫方的归属区域中的I-CSCF设备或者S-CSCF设备。以图3为例，假设被叫方为UE2，UE2的归属区域为接入网设备10的覆盖区域，则UE2的归属区域中的第二CSCF设备为图3中的I-CSCF设备14或者S-CSCF设备15。
应理解，本申请实施例中的第一呼叫信令除了可以是SIP Invite之外，还可以是漫入用户设备与其他呼叫设备之间的呼叫业务相关的其他呼叫信令，例如，还可以是表一所示的信令；但为了叙述方便，本申请实施例主要以SIP-Invite为例描述相关方案，将不再赘述。
表一
呼叫信令
主叫启呼信令：Invite
被叫忙信令：486(Busy Here reason＝17)
被叫关机信令：487(Request Terminated reason＝31)
被叫无应答信令：408(Request Timeout reason＝19)
被叫不可及信令：480(Temporarily unavailable reason＝18)
被叫等待信令：180(携带alert-info头域)
被叫呼转信令：181或者183(携带前转信息)
被叫振铃信令：180
被叫摘机信令：200OK-invite
主叫挂机信令：bye(leg＝1)
被叫挂机信令：bye(leg＝2)
需要说明的是，表一仅为示例性表格，本申请实施例不限定第一呼叫信令为哪种类型的信令，除表一所示信令之外，第一呼叫信令还可以是其他信令。
S402：第一CSCF设备基于第一通信消息使第一呼叫信令被路由到漫入用户设备的漫游地AS，漫游地AS为第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS。
S402中所述的呼叫增值业务的相关描述可参照上文所述，不予赘述。示例性的，第一CSCF设备基于第一通信消息使第一呼叫信令被路由到漫入用户设备的漫游地AS可以包括：第一CSCF设备基于第一通信消息确定第一呼叫信令的主叫方或者被叫方为第一CSCF设备的漫入用户设备，直接向漫游地AS发送包含第一呼叫信令的第二通信消息；或者，第一CSCF设备通过第一CSCF设备的归属区域中的第二CSCF设备使第一呼叫信令被路由到漫入用户设备的漫游地AS，如漫入用户设备为图3中的UE1，UE1的漫游地AS为图3中的AS24或AS25，图4中S402(a)-S402(c)所示，分别描述如下：
S402(a)：第一CSCF设备基于第一通信消息确定第一呼叫信令的主叫方或被叫方为第一CSCF设备的漫入用户设备。
示例性的，在第一呼叫信令的主叫方为第一CSCF设备的漫入用户设备的情况下，第一CSCF设备可以根据第一通信消息中的from头域或者PAI头域携带的主叫方的信息确定主叫方的归属区域，进而确定主叫方的归属区域与第一CSCF的归属区域不同，从而确定第一呼叫信令的主叫方为第一CSCF设备的漫入用户设备，反之，则确定主叫方处于自己的归属区 域中，不是漫入用户设备。
例如，以主叫方的信息为主叫方的手机号135XXXX4308为例，第一CSCF设备可以根据主叫方的手机号、以及下表二所示的手机号码中标识归属区域的号码段与归属区域之间的对应关系确定主叫方的手机号码段对应的归属区域为区域1。
表二
号码段 归属区域
135XXXX 区域1
135YYYY 区域2
示例性地，在第一呼叫信令的被叫方为第一CSCF设备的漫入用户设备的情况下，第一CSCF设备可以根据第一通信消息中的to头域携带的被叫方的信息确定被叫方的归属区域，进而确定被叫方的归属区域与第一CSCF的归属区域不同，从而确定被叫方为第一CSCF设备的漫入用户设备，反之，则确定被叫方处于自己的归属区域中。
进一步的，执行S402(b)。
具体地，第一CSCF设备确定第一呼叫信令的主叫方或被叫方为漫入用户设备之后，执行S402(b)之前，所述方法还可以包括：第一CSCF设备确定漫入用户设备具备使用第一CSCF设备的归属区域(也就是漫入用户设备的漫游区域)中的AS提供的呼叫增值业务的能力。如此，在确定漫入用户设备支持漫游区域的AS提供的呼叫增值业务的情况下，才触发漫游地的AS为漫入用户设备提供呼叫增值业务，避免因漫入用户设备不支持漫游地的AS提供的呼叫增值业务，导致无法使用漫游地的呼叫增值业务、进而影响用户体验的问题。
示例性地，第一CSCF设备可以从第一通信消息获取漫入用户设备的能力信息，也可以向HSS等设备请求获得漫入用户设备的能力信息。
示例性的，第一CSCF设备可以根据根据配置策略和/或漫入用户设备的能力信息确定漫入用户设备具备使用第一CSCF设备的归属区域中的AS提供的呼叫增值业务的能力。
具体地，配置策略可以用于确定具备使用第一CSCF设备的归属区域中的AS提供的呼叫增值业务的能力的漫入用户设备。配置策略可以包括漫入用户设备对应的接入信息，如包括漫入用户设备的接入网设备信息、小区位置信息、接入网络类型等配置信息中的一种或者多种信息。配置策略可以预先存储在第一CSCF设备上或者由第一CSCF设备从其他设备(如HSS)获取，不予限制。如果漫入用户设备的接入信息满足配置策略的规定和/或漫入用户设备的能力信息指示漫入用户设备具备处理漫游区域的AS提供的呼叫增值业务的能力(如媒体内容解码能力、网络能力或者存储能力等)，则确定漫入用户设备具备使用第一CSCF设备的归属区域中的AS提供的呼叫增值业务的能力。
具体地，接入网设备信息可以用于标识接入网设备，为接入网设备的因特网(internet protocol，IP)地址或者媒体接入控制(midia access control，MAC)地址等。
具体地，小区位置信息可以用于标识某个小区，小区位置信息可以为小区的物理小区标识符(physical cell identifier，PCI)或者小区全球标识符(cell global identifier，CGI)。
具体地，接入网络类型可以用于指示接入网络所采用的无线接入技术(radio access technology，RAT)或固定接入技术。RAT可以包括蓝牙接入、无线保真(wireless-fidelity，wifi)接入、新无线(new radio，NR)接入、长期演进(long term evolution，LTE)接入中任一种接入技术，固定接入技术可以包括局域网(local area network，LAN)技术、无线局 域网(wirele local area network，WALN)技术、各种类型数字用户线路(digital subscribe line，xDSL)技术或者xPON技术等。
可选地，第一CSCF设备可以从漫入用户设备的接入设备获取漫入用户设备的能力信息和接入信息。
应理解，本申请其他实施例中的漫入用户设备的接入信息、漫入用户设备的能力信息可参照上面的相关描述，将不赘述。
S402(b)：第一CSCF设备响应于S402(a)的确定结果，向第一CSCF设备的归属区域中的第二CSCF设备发送第二通信消息。
具体地，第一CSCF设备的归属区域中的第二CSCF设备可以是第一CSCF设备的归属区域中的I-CSCF设备或者S-CSCF设备。
具体地，第二通信消息可以为SIP消息，第二通信消息可以包括现有通信消息(如第一通信消息)所包括的参数，如包括第一呼叫信令、路由相关字段、消息体等等。除此之外，第二通信消息还可以包括第一指示信息。第一指示信息的名称不限定，可以称为“漫入标识”或者“路由标识”或者“flag1”，都可以用于指示(indicate)第一呼叫信令的主叫方或被叫方为第一CSCF设备的漫入用户设备，以便第二CSCF设备根据第一指示信息，确定第一呼叫信令的主叫方或被叫方为漫入用户设备，触发漫入用户设备的漫游地AS为漫入用户设备提供呼叫增值业务。
进一步的，第一指示信息还可以指示使第一呼叫信令或者第一呼叫信令对应的呼叫业务的第二呼叫信令被路由到漫入用户设备的漫游地AS。其中，呼叫业务如上文所述，本申请实施例中呼叫业务的呼叫信令可以包括第一呼叫信令以及第二呼叫信令，呼叫业务的第二呼叫信令是指除第一呼叫信令之外的与该呼叫业务有关的其他呼叫信令或者第一呼叫信令之后传输的其他呼叫信令，如第二呼叫信令可以包括上述表一所示的信令。例如假设第一通信消息中包含的第一呼叫信令为SIP Invite，则该对应的呼叫业务的第二呼叫信令可以是被叫忙信令、被叫关机信令、被叫无应答信令、被叫不可及信令、被叫等待信令、被叫呼转信令、被叫振铃信令、被叫摘机信令、主叫挂机信令、被叫挂机信令。
应理解，第一指示信息实质上是一种“路由指示信息”，该路由指示信息可以改变主叫方以及被叫方之间传输的呼叫业务的呼叫信令所经历的呼叫路线，该呼叫路线会经过漫入用户设备的漫游地AS，使得呼叫业务的呼叫信令路由到漫入用户设备的漫游地AS，以使漫入用户设备的漫游地AS有机会为漫入用户提供呼叫增值业务，例如，在呼叫业务过程中触发漫入用户设备呈现媒体内容。该呼叫业务的首个呼叫信令(如起呼时的Invite消息)所经历的呼叫路线确定后，呼叫业务对应的后续呼叫信令可以按照该呼叫路线进行传输。
为了确定呼叫业务的首个呼叫信令(如起呼时的Invite消息)所经历的呼叫路线、使呼叫业务对应的后续呼叫信令可以按照该呼叫路线进行传输时，该呼叫路线上的各个设备可以将第一指示信息与第一呼叫信令对应的呼叫业务或通信会话对应存储，这样，在后续收到对应同一呼叫业务或通信会话的其他呼叫信令后，可以根据存储的对应关系获取到第一指示信息，再根据第一指示信息确定将第一呼叫信令路由到漫游地AS。
例如，以主叫方为第一CSCF设备的漫入用户设备，主叫方向被叫方发送SIP Invite为例，通过第一指示信息可以将SIP Invite的原本路线：(主叫方-主叫方的漫游区域中的第一CSCP设备-主叫方的归属区域的I-CSCF设备/S-CSCF设备-被叫方)更改为下述路线：(主 叫方-主叫方的漫游区域中的第一CSCP设备-主叫方的漫游区域的I-CSCF设备/S-CSCF设备-主叫方的漫游地AS-主叫方的漫游区域的I-CSCF设备/S-CSCF设备-主叫方的归属区域的I-CSCF设备/S-CSCF设备-被叫方)。其中更改后的路线的主叫方的漫游区域中的第一CSCP设备、主叫方的漫游区域的I-CSCF设备/S-CSCF设备、主叫方的漫游地AS、主叫方的漫游区域的I-CSCF设备/S-CSCF设备、主叫方的归属区域的I-CSCF设备/S-CSCF设备等可以将第一指示信息与第一呼叫信令对应的呼叫业务或通信会话对应存储，例如，将第一指示信息与呼叫业务标识或者通信会话标识对应存储。
具体地，上述更改后路线的各个设备可以采用下述方式一或者方式二将第一指示信息携带在通信消息(如第二通信消息或者其他通信消息)中：
方式一、通过通信消息中新的头域携带第一指示信息，例如，该新的头域可以为输入拜访指示头域(P-visted-incoming-indication)。
方式二、通过通信消息中已存在的头域的属性携带第一指示信息，例如，在已有的P-Access-Network-Info头域的属性中包含漫游漫入指示(roam-incoming-indication)，roam-incoming-indication的取值标识第一呼叫信令的主叫方或被叫方为是否是漫入用户设备。
例如，如下字段所示，P-Access-Network-Info头域中除包括现有字段外，还包括roam-incoming-indication＝1，表示第一呼叫信令的主叫方或被叫方为漫入用户设备：
P-Access-Network-Info:
3GPP-E-UTRAN；utran-cell-id-3gpp＝46001251C6042203；roam-incoming-indication＝1；
ue-ip＝[2408:8556:41C:B3BF:7BDA:1BDD:2241:5983]；ue-port＝43518；network-provided。
一种示例中，在第一CSCF设备与I-CSCF设备/S-CSCF设备独立部署的情况下，第一CSCF设备向第一CSCF设备的归属区域中的AS发送第二通信消息可以包括：第一CSCF设备向第一CSCF设备的归属区域中的第二CSCF设备发送第二通信消息，第二CSCF设备可以为第一CSCF设备的归属区域中的I-CSCF设备/S-CSCF设备；第二CSCF设备接收第二通信消息，向第一CSCF的归属地AS发送第二通信消息。
该示例中，由于第一呼叫信令的主叫方或被叫方为第一CSCF设备的漫入用户设备，漫入用户设备未在第一CSCF设备的归属区域中进行注册，故第一CSCF设备上不存在漫入用户设备的注册信息，第一CSCF设备无法在本地找到漫入用户设备注册的I-CSCF设备/S-CSCF设备。鉴于此，第一CSCF设备可以随机地从第一CSCF设备的归属区域中的多个CSCF设备中选择出一个CSCF设备作为第二CSCF设备，或者，依据负载均衡原则，在第一CSCF设备的归属区域中的多个CSCF设备中，选择负载最小或者负载小于预设阈值的CSCF设备作为第二CSCF设备。其中，预设阈值可以根据需要设置，不予限制。
具体的，第一CSCF设备的归属区域中的多个CSCF设备可以是第一CSCF设备的归属区域中的多个I-CSCS设备或者S-CSCF设备。
具体地，选择负载最小的CSCF设备作为第二CSCF设备可以包括：如果第一通信消息携带的第一呼叫信令为第一CSCF设备接收到的第M个第一呼叫信令，则选择第一CSCF设备的归属区域中的M个CSCF设备中的第i个CSCF设备作为第二CSCF设备，i＝MmodN，M、N为大于等于1的整数。
例如，以第二CSCF设备为I-CSCF设备为例，第一CSCF设备的归属区域中有5个I-CSCF 设备为例，第一CSCF设备可以将接收到第一个第一呼叫信令携带在通信消息中发送给第1个I-CSCF设备，将接收到的第二个第一呼叫信令携带在通信消息中发送给第2个I-CSCF设备，将接收到的第3个第一呼叫信令携带在通信消息中发送给第3个I-CSCF设备，将接收到的第4个第一呼叫信令携带在通信消息中发送给第4个I-CSCF设备，以此类推，将接收到的第5个第一呼叫信令携带在通信消息中发送给第5个I-CSCF设备，将第6个第一呼叫信令携带在通信消息中发送给第1个I-CSCF设备，将第8个第一呼叫信令携带在通信消息中发送给第3个I-CSCF设备。
可选地，第二通信消息中还可以包含第二CSCF设备的地址信息，如第二通信消息的路由相关字段中包含第二CSCF设备的地址信息，以便第二CSCF设备的上一跳根据第二CSCF设备的地址信息使第一呼叫信令或者第一呼叫信令对应的呼叫业务的第二呼叫信令被路由到第二CSCF设备。
S402(c)：第一CSCF设备的归属区域中的第二CSCF设备接收第一CSCF设备发送的第二通信消息，基于第二通信消息使第一呼叫信令被路由到漫入用户设备的漫游地AS。
示例性的，第一CSCF设备的归属区域中的第二CSCF设备根据第二通信消息包括的第一指示信息，确定第一呼叫信令的主叫方或被叫方为第一CSCF设备的漫入用户设备，向漫入用户设备的漫游地AS发送第二通信消息。进一步的，如上所述，为了后续将呼叫业务的其他呼叫信令路由到漫游地AS，第一CSCF设备的归属区域中的第二CSCF设备可以将第一指示信息与第一呼叫信令对应的呼叫业务或通信会话对应存储。
由于第一呼叫信令的主叫方或被叫方为第一CSCF设备的漫入用户设备，第一CSCF设备的归属区域中的HSS上不存在漫入用户设备的签约信息或者注册信息，故第二CSCF设备接收到第二通信消息时，不再通过与HSS进行信令交互来对漫入用户设备进行鉴权处理，而是直接进行初始过滤准则(initial filter criteria，iFC)触发逻辑，如第二CSCF设备可以遍历第一CSCF设备的归属区域中的每个AS，根据接收到的第二通信消息的头字段或者消息内容，检查该第二通信消息是否存在满足第一CSCF设备的归属区域中的AS(即漫入用户设备的漫游地AS)提供的触发条件，即进行iFC的判断，如果存在，则向第一CSCF设备的归属区域中的AS发送第二通信消息，以触发第一CSCF设备的归属区域中的AS向漫入用户设备提供呼叫增值业务，如果不存在，就不发送第二通信消息，不触发第一CSCF设备的归属区域中的AS提供呼叫增值业务。
上述第二CSCF设备根据第二通信消息的头字段或者消息内容，检查该第二通信消息是否存在满足第一CSCF设备的归属区域中的AS设定的触发条件的过程可参照现有技术，不予赘述。例如，若某个漫入用户设备订阅了即使消息业务，则漫入用户设备发送的SIP消息的任何一个字段或消息体的内容及它们的组合存在满足即使消息服务器对应的触发条件。
需要说明的是，S402(b)-S402(c)所示过程可以应用于第一CSCF设备与第二CSCF设备分离部分的场景的，可替换的，在第二CSCF设备集中部署在第一CSCF设备的情况下，S402(b)-S402(c)可以替换为第一CSCF设备直接向漫入设备的漫游地AS发送第二通信消息。如第一CSCF设备接收第一通信消息，根据第一通信消息确定第一呼叫信令的主叫方或被叫方为漫入用户设备后，进行iFC触发逻辑，根据第一通信消息的头字段或者消息内容，确定第一通信消息存在的触发条件满足第一CSCF设备的归属区域中的哪个AS的触发条件，向该AS发送第二通信消息，触发该AS提供呼叫增值业务。
S403：漫入用户设备的漫游地AS(即第一CSCF设备的归属区域中的AS)接收第二通信消息，基于第二通信消息为漫入用户设备提供呼叫增值业务。
其中，漫入用户设备的漫游地AS基于第二通信消息为漫入用户设备提供呼叫增值业务的方式可以为下述方式一或者方式二：
方式一：漫入用户设备的漫游地AS根据第二通信消息中的第一指示信息确定第一呼叫信令的主叫方或被叫方为漫入用户设备，如果漫游地AS根据业务优先级处理策略确定由漫游地AS优先为漫入用户设备提供呼叫增值业务，则在接续呼叫之前，为漫入用户设备提供呼叫增值业务，完成与漫入用户设备之间漫游地业务逻辑。例如，漫游地AS可以在接续呼叫之前与漫入用户设备之间建立媒体通道，通过该媒体通道向漫入用户设备提供呼叫增值业务对应的媒体流，触发漫入用户设备在第一呼叫信令对应的呼叫业务相关的APP界面上呈现媒体内容、或游戏内容等，使用呼叫增值业务。
方式一中，漫游地AS可以在接续呼叫完成之前或接续呼叫过程中已经为漫入用户设备提供呼叫增值业务。例如，以主叫方为漫入用户设备，呼叫业务为语音呼叫业务，呼叫增值业务为彩铃业务为例，可以在主叫方拨出电话号码--被叫方振铃之前的这段时间内，由漫游地AS为主叫方提供彩铃业务。
具体地，接续呼叫可以指漫游地AS向被叫方发出第一呼叫信令到第一呼叫信令到达被叫方的过程。在漫入用户设备为主叫方的情况下，接续呼叫可以包括图5所示S504-S507。在漫入用户设备为第一呼叫信令的被叫方的情况下，接续呼叫可以包括：漫入用户设备的漫游地AS向第一CSCF设备或者第一CSCF设备的归属区域中的第二CSCF设备发送第一呼叫信令。第一CSCF设备或者第一CSCF设备的归属区域中的第二CSCF设备接收第一呼叫信令，将第一呼叫信令发送给被叫方，至此接续呼叫完成。
具体地，业务优先级处理策略可以用于规定漫游地AS与归属地AS提供呼叫增值业务的优先级，可以用于规定由漫游地AS优先向漫入用户设备提供呼叫增值业务，还是由归属地AS优先向漫入用户设备提供呼叫增值业务。业务优先级处理策略可以预先配置在漫游地AS、漫入用户设备的归属地AS，也可以由漫游地AS从其他设备获取，如从HSS获取等。
方式二、漫入用户设备的漫游地AS根据第二通信消息中的第一指示信息确定第一呼叫信令的主叫方或被叫方为漫入用户设备，如果漫游地AS根据业务优先级处理策略确定由漫游地AS优先为漫入用户设备提供呼叫增值业务，则将为漫入用户设备提供呼叫增值业务，应理解，此时，漫游地AS可以为提供呼叫增值业务进行传输配置信息等准备工作，并未向漫入用户设备提供呼叫增值业务。
进一步的，漫游地AS向第一CSCF设备或者第一CSCF设备的归属区域中的第二CSCF设备发送第三通信消息，实现呼叫接续。其中第三通信消息包含第一呼叫信令、第一指示信息以及第二指示信息，第二指示信息用于指示漫游地AS将为漫入用户设备提供呼叫增值业务。需要说明的是，第二指示信息可以包含在第三通信消息中，也可以不包含在第三通信消息中，不予限制。
呼叫接续完成之后，从漫入用户设备的归属区域中的第三CSCF设备向第一CSCF设备或者第一CSCF设备的归属区域中的第二CSCF设备发送第五通信消息，第五通信消息包含第一指示信息；第一CSCF设备或者第一CSCF设备的归属区域中的第二CSCF设备根据第一指示信息，向漫游地AS发送第六通信消息，第六消息包括第一指示信息以及第三指示信 息。漫游地AS接收来自第一CSCF设备或者第一CSCF设备的归属区域中的第二CSCF设备的第六通信消息，第六通信消息包括第一指示信息。需要说明的是，第一CSCF设备或者第一CSCF设备的归属区域中的第二CSCF设备可以直接向漫游地AS发送第六通信消息，还可以通过中间设备向漫游地AS发送第六通信消息，不予限制。
进一步的，如果漫入用户设备的归属地AS根据业务优先级策略确定由归属地AS优先为漫入用户设备提供呼叫增值业务，则第五通信消息、第六通信消息还可以包含第三指示信息，第三指示信息用于指示漫入用户设备的归属地AS将为漫入用户设备提供呼叫增值业务；反之，如果漫入用户设备的归属地AS根据业务优先级策略确定由漫游地AS优先为漫入用户设备提供呼叫增值业务，则第五通信消息、第六通信消息不包含第三指示信息。
进一步的，漫游地AS接收到的第六通信消息包括第三指示信息，则漫游地AS根据业务优先级处理策略以及第三指示信息，确定是否由漫游地AS优先为漫入用户设备提供呼叫增值业务，如果是，则为漫入用户设备提供呼叫增值业务，如果不是，则不提供。
进一步的，如上所述，为了后续将呼叫业务的其他呼叫信令路由到漫游地AS，漫游地AS可以将第一指示信息与第一呼叫信令对应的呼叫业务或通信会话对应存储。
基于图4所示方法，在确定第一呼叫信令的主叫方或者被叫方为第一CSCF设备的漫入用户设备的情况下，使第一呼叫信令被路由到漫入用户设备的漫游地AS，由漫入用户设备的漫游地AS为漫入用户设备提供呼叫增值业务。由于漫游到用户设备的归属区域之外的用户设备与其漫游地AS距离较近，由漫入用户设备的漫游地AS为该用户设备提供呼叫增值业务，由于漫入用户设备与漫游地AS之间距离较近，漫入用户设备与漫游地AS之间的端到端时延较低，提高用户体验。同时，本申请实施例提供的呼叫方法中，应用服务器不仅可以为本地主叫方提供呼叫增值业务，而且可以为漫游到归属区域中的漫入用户设备提供呼叫增值业务，增加AS为主叫方提供服务的机会，提高网络资源利用率。
下面结合图5，以第一呼叫信令的主叫方为漫入用户设备，漫入用户设备的漫游地AS在接续呼叫之前已经为漫入用户设备提供呼叫增值业务为例，对图4对应的实施例中所述的接续过程进行描述。第一呼叫信令的被叫方为漫入用户设备时的接续过程可参照现有技术，不予赘述。
图5为本申请实施例提供的一种呼叫方法的流程图，该方法包括S501-S507：
执行S501-S503。其中，S501-S503与图4中S401-S403相同，不予赘述。
S504：漫入用户设备的漫游地AS向第一CSCF设备的归属区域中的第二CSCF设备发送第三通信消息。
其中，上述第三通信消息可以包括第一呼叫信令、第一指示信息以及其他现有头域或者消息。
在接续呼叫的过程中，可能会触发漫入用户设备的归属地AS为漫入用户设备提供呼叫增值业务。进一步的，为了避免漫入用户设备的漫游区域的AS以及漫入用户设备的归属地AS同时为漫入用户设备提供呼叫增值业务带来的业务冲突的问题，第三通信消息还可以包括第二指示信息，以指示漫入用户设备的漫游地AS已经为漫入用户设备提供呼叫增值业务，以使得漫入用户设备的归属地AS根据第二指示信息获知漫入用户设备的漫游地AS已经为漫入用户设备提供呼叫增值业务，不触发归属地业务流程。
具体地，第二指示信息的名称不限定，可以称为“业务标识”或者“flag2”或者“漫游地业务 标识”。如果漫游地AS配置第二指示信息之前，已经为漫入用户设备提供呼叫增值业务，则第二指示信息可以如上文所述，指示漫游地AS已经为漫入用户设备提供呼叫增值业务，如果漫游地AS配置第二指示信息之前，确定可能为漫入用户设备提供呼叫增值业务，正在为提供呼叫增值业务做准备，则第二指示信息可以用于指示漫游地AS将漫入用户设备提供呼叫增值业务。类似的，参照第一指示信息的作用，如果归属地AS或者其他AS也确定可能会为漫入用户设备提供呼叫增值业务，则归属地AS或者其他AS也可以分配用于一指示信息，如第三指示信息，该第三指示信息可以指示归属地AS或者其他AS将为漫入用户设备提供呼叫增值业务的指示信息，以使得接收到第三指示信息的AS根据第三指示信息获知归属地AS或者其他AS提供呼叫增值业务的情况，采用相应措施避免业务冲突。
以第二指示信息为例，应理解，第二指示信息实质上是一种“业务指示信息”，该业务指示信息可以避免漫入用户设备的归属区域中的归属地AS或者其他AS与漫游地AS之间的业务冲突。例如，本申请实施例中，第二指示信息可以按照第一呼叫信令的呼叫路线被路由到漫入用户设备的归属区域中的归属地AS或者其他AS,如第一呼叫信令的呼叫路线上的设备可以将第二指示信息携带在通信消息中路由到漫入用户设备的归属区域中的归属地AS或者其他AS，以便归属地AS或其他AS根据第二指示信息获知漫游地AS为漫入用户设备提供呼叫增值业务情况，避免与漫游地AS业务冲突。
具体地，第一呼叫信令的呼叫路线上的各个设备可以采用下述方式一或者方式二或者方式三将第二指示信息携带在通信消息(如第三通信消息或者其他通信消息)中：
方式一、通过通信消息中新的头域携带第二指示信息，例如，该新的头域可以为输入业务指示头域(P-visited-service-indication)。
方式二、通过通信消息中已存在的头域的属性携带第二指示信息，例如，在已有的P-Asserted-Service-Info头域的属性中包含业务码(service-code)，service-code的取值可以标识漫入用户设备的漫游地AS已经为漫入用户设备提供呼叫增值业务。
方式三：通过通信消息的消息体携带第二指示信息，例如，在消息体中会话描述信息的媒体描述属性行增加第二指示信息：a＝g.3gpp.rmas。
S505：第一CSCF设备的归属区域中的第二CSCF设备接收第三通信消息，向漫入用户设备的归属区域中的第二CSCF设备发送第四通信消息。
具体地，漫入用户设备的归属区域中的第二CSCF设备可以为漫入用户设备的归属区域中的I-CSCF设备或者S-CSCF设备。
其中，S505中所述的第四通信消息可以包括第三通信消息所包括的内容，如可以包括第一呼叫信令、第一指示信息以及第二指示信息等。
示例性的，第一CSCF设备的归属区域中的第二CSCF设备可以根据漫入用户设备的号码段确定漫入用户设备的归属区域，从漫入用户设备的归属区域中的HSS中获取漫入用户设备的签约信息，根据漫入用户设备的签约信息确定漫入用户设备的归属区域中的第三CSCF设备，向归属区域中的第三CSCF设备发送第四通信消息。本申请实施例中，第三CSCF设备可以包括漫入用户设备的归属区域中的I-CSCF设备或者S-CSCF设备或其他能够接收第四通信消息并将第四通信消息路由到归属地AS的设备。
进一步的，如上所述，为了后续将呼叫业务的其他呼叫信令按照呼叫路线到漫游地AS，漫入用户设备的归属区域中的第三CSCF设备可以将第一指示信息与第一呼叫信令对应的呼 叫业务或通信会话对应存储。
S506：漫入用户设备的归属区域中的第三CSCF设备接收第四通信消息，向漫入用户设备的归属地AS发送第七通信消息。
示例性的，漫入用户设备的归属地AS接收第七通信消息，与归属区域中的HSS交互获取归属地AS的iFC触发条件；查看第七通信消息中是否存在满足归属地AS的iFC触发条件，若满足，则向归属地AS发送第七通信消息。
进一步的，为了后续将呼叫业务的其他呼叫信令按照呼叫路线到漫游地AS，漫入用户设备的归属地AS可以将第一指示信息与第一呼叫信令对应的呼叫业务或通信会话对应存储。
S507：漫入用户设备的归属地AS接收第七通信消息，响应于第七通信消息，根据第七通信消息中的第二指示信息获知漫入用户设备的漫游地AS已经为漫入用户设备提供呼叫增值业务，不触发归属地业务流程。进一步的，漫入用户设备的归属地AS放通第一呼叫信令，将本次主叫方向被叫方发送的第一呼叫信令路由给被叫方，完成接续呼叫，同时，呼叫业务的呼叫信令所经历的呼叫路线打通。
需要说明的是，如果漫入用户设备的漫游地AS在由漫游地AS发起的接续呼叫之前没有向漫入用户设备提供呼叫增值业务，而是确定自身准备或计划向漫入用户设备提供呼叫增值业务，则漫游地AS发送的第三通信消息中包括的第二指示信息可以用于指示漫游地AS将为漫入用户设备提供呼叫增值业务。后续，归属地AS接收到第二指示信息，可以根据业务优先级处理策略判断是由自己优先向漫入用户设备提供呼叫增值业务还是由漫游地AS优先，如果归属地AS优先，则用第三指示信息替换/覆盖第二指示信息，并将第三指示信息反馈给给漫游地AS，以便漫游地AS业务优先级处理策略以及第三指示信息最终确定由漫游地AS提供还是归属地AS提供；反之，如果漫游地AS优先，则归属地AS不触发归属地业务流程，接续呼叫。
进一步的，所述方法还包括：漫入用户设备的归属地AS基于第七通信消息使第一呼叫信令或者第一呼叫信令对应的呼叫业务的第二呼叫信令被路由至漫游地AS：
例如，在第一呼叫信令的主叫方是第一CSCF设备的漫入用户设备,且归属地AS优先提供呼叫增值业务的情况下，漫入用户设备的归属地AS接收到来自被叫方的呼叫业务的第二呼叫信令/后续呼叫信令(如Invite消息对应的响应消息)后，根据第七通信消息中的第一指示信息向漫入用户设备的归属地区域中的第三CSCF设备发送包含呼叫业务的第二呼叫信令、第一指示信息和第三指示信息的第八通信消息，第三指示信息指示第二AS将为漫入用户设备提供呼叫增值业务。在第一呼叫信令的主叫方是第一CSCF设备的漫入用户设备,且漫游地AS优先提供呼叫增值业务的情况下，漫入用户设备的归属地AS接收到来自被叫方的呼叫业务的第二呼叫信令/后续呼叫信令(如Invite消息对应的响应消息)后，根据第七通信消息中的第一指示信息，向第三CSCF设备发送第八通信消息，第八通信消息包含呼叫业务的第二呼叫信令、第一指示信息。
又例如，在第一呼叫信令的被叫方是第一CSCF设备的漫入用户设备，且归属地AS优先提供呼叫增值业务的情况下，漫入用户设备的归属地AS根据第七通信消息中的第一指示信息向漫入用户设备的归属地区域中的第三CSCF设备发送包含呼叫业务的第一呼叫信令、第一指示信息和第三指示信息的第八通信消息，第三指示信息指示第二AS将为漫入用户设 备提供呼叫增值业务。又例如，在第一呼叫信令的被叫方是第一CSCF设备的漫入用户设备,且漫游地AS优先提供呼叫增值业务的情况下，漫入用户设备的归属地AS接收到来自被叫方的呼叫业务的第一呼叫信令/后续呼叫信令(如Invite消息对应的响应消息)后，根据第七通信消息中的第一指示信息，向第三CSCF设备发送第八通信消息，第八通信消息包含呼叫业务的第一呼叫信令、第一指示信息。
进一步的，漫入用户设备的归属地区域中的第三CSCF设备根据存储的第一指示信息与呼叫业务或通信会话之间的对应关系，确定本次呼叫业务对应第一指示信息，根据第一指示信息将第八通信消息包含的内容路由给漫入用户设备的漫游区域中的P-CSCF设备或者I-CSCF设备/S-CSCF设备。
下面结合图6所示invite消息的流向图对图4所示方法进行描述，其中假设第一呼叫信令的主叫方UE1，UE1呼叫UE2，UE1的归属区域为区域1，UE1当前漫游到区域2，UE2的归属区域为区域3，用于指示第一呼叫信令的主叫方为漫入用户设备的指示信息命名为网络标识、用于指示AS将为漫入用户设备提供呼叫增值业务的指示信息命名为业务标识。如图6所示的消息流向包括以下过程：
⑴UE1向区域2中的P-CSCF设备发送invite消息。
⑵P-CSCF设备根据invite消息的来自(from)头域，确定UE1为漫入用户设备，分配网络标识1，并向区域2中的I-CSCF设备/S-CSCF设备发送网络标识1以及invite消息。
⑶区域2中的I-CSCF设备将接收到的网络标识1以及invite消息发送给S-CSCF设备。区域2中的S-CSCF设备完成iFC触发逻辑，向区域2中满足iFC触发条件的AS1发送网络标识1以及invite消息。
⑷AS1接收网络标识1以及invite消息，确定为漫入用户设备提供呼叫增值业务，则分配用于标识AS1将为UE1提供呼叫增值业务的业务标识1，向区域2中的I-CSCF设备/S-CSCF设备发送网络标识1、业务标识1以及invite消息。
⑸区域2中的I-CSCF设备/S-CSCF设备接收网络标识1、业务标识1以及invite消息，向区域1中的I-CSCF设备/S-CSCF设备发送网络标识1、业务标识1以及invite消息。
⑹区域1中的I-CSCF设备将接收到的网络标识1、业务标识1以及invite消息发送给区域1中的S-CSCF设备，区域1中的S-CSCF设备完成iFC触发逻辑，向区域1中满足iFC触发条件的AS2发送网络标识1、业务标识1以及invite消息。
⑺区域1中满足iFC触发条件的AS2接收网络标识1、业务标识1以及invite消息，在根据业务优先级处理策略确定由AS2优先为UE1提供呼叫增值业务的情况下，则用业务标识2替换业务标识1，业务标识2用于指示AS2将为UE1提供呼叫增值业务，向区域1中的I-CSCF设备/S-CSCF设备发送网络标识1、业务标识2以及invite消息。反之，在根据业务优先级处理策略确定由AS1优先为UE1提供呼叫增值业务的情况下，则向区域1中的I-CSCF设备/S-CSCF设备发送网络标识1、业务标识1以及invite消息。
⑻区域1中的I-CSCF设备/S-CSCF设备接收网络标识1、业务标识2以及invite消息，将invite消息发送给UE2，完成接续呼叫。后续，将网络标识1、业务标识2/业务标识1路由到UE1的漫游区域中的AS1，由AS1根据业务标识2/业务标识1以及业务优先级处理策略最终确定由AS1提供呼叫增值业务还是由AS2提供呼叫增值业务，以便UE1与最终提供呼叫增值业务的AS之间建立媒体通道，接收并呈现呼叫增值业务。
上述图6以第一呼叫信令的主叫方漫游到归属区域/注册区域之外的区域为例对本申请提供的呼叫方法进行了描述。类似的，当被叫方漫游到归属区域/注册区域之外的区域时，可以参照图4所示方法，将发送给被叫方的第一呼叫信令理由到被叫方的漫游区域的IMS网络中，由被叫方的漫游区域中的AS(即被叫方的漫游地AS)为被叫方提供呼叫增值业务。
下面结合图7所示invite消息的流向图对被叫方处于漫游区域时的处理流程进行描述，其中假设第一呼叫信令的被叫方为UE1，UE3呼叫UE1，UE1的归属区域为区域1，UE1当前漫游到区域2，用于指示第一呼叫信令的被叫方为漫入用户设备的指示信息命名为网络标识、用于指示AS将为被叫方提供呼叫增值业务的指示信息命名为业务标识。如图7所示的消息流向包括以下过程：
①：UE3向UE1的归属区域：区域1中的I-CSCF设备/S-CSCF设备发送invite消息。
②：区域1中的I-CSCF设备/S-CSCF设备接收invite消息，完成iFC触发逻辑，向区域1中满足iFC触发条件的AS3发送invite消息。
③：区域1中满足iFC触发条件的AS接收invite消息，在确定为UE1提供呼叫增值业务的情况下，分配业务标识3，向区域1中的I-CSCF设备/S-CSCF设备发送业务标识3以及invite消息。
④：区域1中的I-CSCF设备/S-CSCF设备接收业务标识3以及invite消息，向区域2中的P-CSCF设备发送业务标识3以及invite消息。
⑤：区域2中的P-CSCF设备接收业务标识3以及invite消息，根据invite消息的to头域，确定UE1为漫入用户设备，分配网络标识2，并向区域2中的I-CSCF设备发送网络标识2、业务标识3以及invite消息。
⑥：区域2中的I-CSCF设备将接收到的网络标识2、业务标识3以及invite消息发送给S-CSCF设备。区域2中的S-CSCF设备完成iFC触发逻辑，向区域2中满足iFC触发条件的AS4发送网络标识2、业务标识3以及invite消息。
⑦：区域2中的AS4接收网络标识2、业务标识3以及invite消息根据业务标识3以及业务优先级处理策略最终确定由AS3提供呼叫增值业务还是由AS4提供呼叫增值业务，以便UE1与最终提供呼叫增值业务的AS之间建立媒体通道，接收并呈现呼叫增值业务。同时，AS4将invite消息发送给区域2中的I-CSCF设备/S-CSCF设备。
⑧：区域2中的I-CSCF设备/S-CSCF设备接收invite消息，向区域2中的P-CSCF设备发送invite消息。
⑨：区域2中的P-CSCF设备接收invite消息，向UE1发送invite消息，完成接续呼叫。
下面结合图3所示架构对主叫方的漫游地AS为主叫方提供呼叫增值业务的处理流程进行描述，其中假设第一呼叫信令为invite消息，主叫方为UE1，被叫方为UE2，UE1处于漫游区域，UE2处于归属区域，UE1的漫游区域中的AS1向UE1提供呼叫增值业务。
图8为本申请实施例提供的一种呼叫方法的流程图，该方法包括：
S801：UE1在漫游区域向漫游区域中的P-CSCF设备发送invite消息。
S802：P-CSCF设备根据invite消息中的from头域确定UE1为漫入用户设备。
其中，P-CSCF设备根据invite消息中的from头域确定UE1为漫入用户设备的过程可参照图4对应的实施例中所述，不予赘述。
S803：P-CSCF设备根据配置策略和/或UE1的能力信息，确定UE1具备使用漫游区域 的AS提供的呼叫增值业务的能力，分配第一指示信息，第一指示信息用于指示UE1为漫入用户设备。
其中，P-CSCF设备根据配置策略和/或UE1的能力信息，确定UE1具备使用漫游区域的AS提供的呼叫增值业务的能力的具体过程可参照图4对应的实施例中所述，不予赘述。
S804：P-CSCF设备向P-CSCF设备的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息以及第一指示信息。
S804中，invite消息以及第一指示信息可以包含在同一条通信消息中发送给P-CSCF设备的归属区域中的I-CSCF设备/S-CSCF设备。例如，invite消息以及第一指示信息可以分别携带在通信消息中的不同头域中发送给P-CSCF设备的归属区域中的I-CSCF设备/S-CSCF设备。
示例性的，P-CSCF设备可以向P-CSCF设备的归属区域中的多个I-CSCF设备/S-CSCF设备中，负载最小或者负载小于预设阈值的I-CSCF设备/S-CSCF设备发送invite消息以及第一指示信息。其具体实现过程可参照图4对应的实施例中所述，不予赘述。
S805：I-CSCF设备/S-CSCF设备接收invite消息以及第一指示信息，根据第一指示信息确定invite消息为漫入用户设备发起的invite消息，则执行iFC触发逻辑，向P-CSCF设备的归属区域中满足iFC触发逻辑的AS1发送invite消息以及第一指示信息。
S806：AS1接收invite消息以及第一指示信息，根据第一指示信息确定invite消息为漫入用户设备发起的invite消息，并根据业务优先级处理策略确定由漫游区域中的AS优先为漫入用户设备提供呼叫增值业务，则AS1完成与UE1之间的漫游地业务逻辑。
进一步的，执行下述S807-S811，完成呼叫接续。其中，在呼叫接续过程中，可能会触发UE1的归属地AS为UE1提供呼叫增值业务。为了避免UE1的归属地AS以及UE1的漫游区域中的AS同时为UE1提供呼叫增值业务带来的业务冲突的问题，漫游区域中的AS1还需要分配第二指示信息并在呼叫接续过程中将第二指示信息路由到UE1的归属地AS，第二指示信息可以用于指示AS1已经为UE1提供呼叫增值业务，以便归属地AS根据第二指示信息确定AS1已经为UE1提供呼叫增值业务，不触发归属地业务处理流程。
S807：AS1分配第二指示信息，第二指示信息用于指示AS1已经为UE1提供呼叫增值业务，向P-CSCF设备的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息、第一指示信息以及第二指示信息。
S808：P-CSCF设备的归属区域中的I-CSCF设备/S-CSCF设备接收invite消息、第一指示信息以及第二指示信息，根据第一指示信息将invite消息、第一指示信息以及第二指示信息发送给UE1的归属区域中的I-CSCF设备/S-CSCF设备。
S809：UE1的归属区域中的I-CSCF设备/S-CSCF设备接收invite消息、第一指示信息以及第二指示信息，执行iFC触发逻辑，向UE1的归属区域中满足iFC触发逻辑的AS2发送invite消息、第一指示信息以及第二指示信息。
S810：AS2接收invite消息、第一指示信息以及第二指示信息，根据第二指示信息归属地AS根据第二指示信息确定AS1已经为UE1提供呼叫增值业务，不触发归属地业务处理流程，向UE1的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息、第一指示信息。
S811：UE1的归属区域中的I-CSCF设备/S-CSCF设备从AS2接收invite消息、第一指示信息，根据invite消息中的to头域，向UE2的归属区域中的I-CSCF设备/S-CSCF设备发 送invite消息，完成接续呼叫。
其中，接续呼叫过程可以包括：UE2的归属区域中的I-CSCF设备/S-CSCF设备接收invite消息，执行iFC触发逻辑，向UE2的归属区域中满足iFC触发逻辑的AS发送invite消息；
UE2的归属地AS接收invite消息，并在确定为UE2提供呼叫增值业务的情况下，完成与UE2之间的归属地业务逻辑。其中，该过程可参照现有技术，不予赘述。
UE2的归属地AS向UE2的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息，UE2的归属区域中的I-CSCF设备/S-CSCF设备接收invite消息，向UE2的归属区域中的P-CSCF设备发送invite消息，UE2的归属区域中的P-CSCF设备接收invite消息，向UE2发送invite消息。
进一步的，UE2接收到invite消息后，向UE1返回与invite消息对应的响应消息。示例性的，UE2可以按照invite消息的发送路径向UE1返回invite消息对应的响应消息。
基于图8所示方法，UE1在漫游区域发起invite消息后，UE1的漫游区域中的P-CSCF设备可以将UE1发起的invite消息路由到UE1的漫游区域中的IMS网络，由UE1的漫游区域中的AS为UE1提供呼叫增值业务。同时，为了避免UE1的漫游区域中的AS以及归属地AS同时为UE1提供呼叫增值业务带来的业务冲突，在接续呼叫过程中将UE1的漫游区域中的AS分配的第二指示信息发送给归属地AS，以便归属地AS根据第二指示信息确定AS1已经为UE1提供呼叫增值业务，不触发归属地业务处理流程。
图8以漫游区域中的AS优先为UE1提供呼叫增值业务为例对本申请提供的呼叫方法进行了说明。一种可能的设计中，本申请实施例中，还可以由归属地AS优先为UE1提供呼叫增值业务。下面结合图3所示架构对主叫方的归属地AS为主叫方提供呼叫增值业务的处理流程进行描述，其中假设第一呼叫信令为invite消息，主叫方为UE1，被叫方为UE2，UE1呼叫UE2，UE1处于漫游区域，UE2处于归属区域，归属地AS优先为UE1提供呼叫增值业务。
图9为本申请实施例提供的一种呼叫方法的流程图，该方法包括：
S901：UE1在漫游区域向漫游区域中的P-CSCF设备发送invite消息。
S902：P-CSCF设备根据invite消息中的from头域确定UE1为漫入用户设备。
其中，P-CSCF设备根据invite消息中的from头域确定UE1为漫入用户设备的过程可参照图4对应的实施例中所述，不予赘述。
S903：P-CSCF设备根据配置策略和/或UE1的能力信息，确定UE1具备使用漫游区域的AS提供的呼叫增值业务的能力，分配第一指示信息，第一指示信息用于标识UE1为漫入用户设备。
其中，P-CSCF设备根据配置策略和/或UE1的能力信息，确定UE1具备使用漫游区域的AS提供的呼叫增值业务的能力的具体过程可参照图4对应的实施例中所述，不予赘述。
S904：P-CSCF设备向P-CSCF设备的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息以及第一指示信息。
S904中，invite消息以及第一指示信息可以包含在同一条通信消息中发送给P-CSCF设备的归属区域中的I-CSCF设备/S-CSCF设备。
示例性的，P-CSCF设备可以向P-CSCF设备的归属区域中的多个I-CSCF设备/S-CSCF设备中，负载最小或者负载小于预设阈值的I-CSCF设备/S-CSCF设备发送invite消息以及第 一指示信息。其具体实现过程可参照图4对应的实施例中所述，不予赘述。
S905：I-CSCF设备/S-CSCF设备接收invite消息以及第一指示信息，根据第一指示信息确定invite消息为漫入用户设备发起的invite消息，则执行iFC触发逻辑，向P-CSCF设备的归属区域中满足iFC触发逻辑的AS1发送invite消息以及第一指示信息。
S906：AS1接收invite消息以及第一指示信息，根据第一指示信息确定自身不准备为漫入用户设备提供呼叫增值业务，向P-CSCF设备的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息、第一指示信息。
S907：P-CSCF设备的归属区域中的I-CSCF设备/S-CSCF设备接收invite消息、第一指示信息，根据第一指示信息将invite消息、第一指示信息发送给UE1的归属区域中的I-CSCF设备/S-CSCF设备。
S908：UE1的归属区域中的I-CSCF设备/S-CSCF设备接收invite消息、第一指示信息，执行iFC触发逻辑，向UE1的归属区域中满足iFC触发逻辑的AS2发送invite消息、第一指示信息。
S909：AS2接收invite消息、第一指示信息，根据业务优先级处理策略确定由UE1的归属地AS2优先为漫入用户设备UE1提供呼叫增值业务。进一步的，AS2完成与UE1之间的归属地业务逻辑。
其中，AS2完成与UE1之间的归属地业务逻辑可以包括：UE1的归属地AS2可以与用户设备之间建立媒体通道，通过该媒体通道向用户设备提供呼叫增值业务对应的媒体流，触发用户设备在第一呼叫信令对应的呼叫业务相关的APP界面上提供媒体内容、或游戏内容等呼叫增值业务。其中，UE1的归属地AS2可以在用户设备的呼叫业务开始、呼叫业务进行中或呼叫业务结束时与用户设备间建立媒体通道，该过程可参照现有技术，不予赘述。
其中，需要说明的是，为了避免与UE1本次发起的呼叫业务相关的第一呼叫信令或者其他呼叫信令路由到UE1的漫游区域中的AS1时，UE1的漫游区域的AS以及UE1的归属区域的AS同时为UE1提供呼叫增值业务带来的业务冲突的问题。AS2向UE1的归属区域中的I-CSCF设备/S-CSCF设备发送第一指示信息以及用于指示AS2即将为UE1提供呼叫增值业务的第三指示信息，UE1的归属区域中的I-CSCF设备/S-CSCF设备根据第一指示信息，将第一指示信息以及用于指示AS2即将为UE1提供呼叫增值业务的第三指示信息，通过UE1的漫游区域中的I-CSCF设备/S-CSCF设备发送给UE1的漫游区域中的AS，UE1的漫游区域中的AS进行业务优先级判断，确定由归属地AS提供呼叫增值业务后，不触发漫游地业务处理流程。具体的，该过程可以包括下述S910～S911：
S910：AS2向UE1的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息、第一指示信息以及第三指示信息。
其中，第三指示信息用于指示AS2将为UE1提供呼叫增值业务。
S911：UE1的归属区域中的I-CSCF设备/S-CSCF设备从AS2接收invite消息、第一指示信息以及第三指示信息，根据invite消息中的to头域，向UE2的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息，完成接续呼叫。
其中，接续呼叫过程可以包括：UE2的归属区域中的I-CSCF设备/S-CSCF设备接收invite消息，执行iFC触发逻辑，向UE2的归属区域中满足iFC触发逻辑的AS发送invite消息。
UE2的归属地AS接收invite消息，并在确定为UE2提供呼叫增值业务的情况下，完成 与UE2之间的归属地业务逻辑。该过程可参照现有技术，不予赘述。
UE2的归属地AS向UE2的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息。UE2的归属区域中的I-CSCF设备/S-CSCF设备接收invite消息，向UE2的归属区域中的P-CSCF设备发送invite消息。UE2的归属区域中的P-CSCF设备接收invite消息，向UE2发送invite消息。
进一步的，UE2接收到invite消息后，向UE1返回与invite消息对应的响应消息。示例性的，UE2可以按照invite消息的发送路径向UE1返回invite消息对应的响应消息。
例如，UE2向UE2的归属区域中的P-CSCF设备发送invite消息对应的响应消息，UE2的归属区域中的P-CSCF设备向UE2的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息对应的响应消息，UE2的归属区域中的I-CSCF设备/S-CSCF设备向UE1的归属区域中的I-CSCF设备/S-CSCF设备发送invite消息对应的响应消息，UE1的归属区域中的I-CSCF设备/S-CSCF设备根据第一指示信息，向UE1的漫游区域中的I-CSCF设备/S-CSCF设备发送invite消息对应的响应消息、第一指示信息以及第三指示信息。UE1的漫游区域中的I-CSCF设备/S-CSCF设备接收invite消息对应的响应消息、第一指示信息以及第三指示信息，根据第一指示信息已经invite消息对应的响应消息返回给漫入用户设备，向UE1的漫游区域中的AS1发送invite消息对应的响应消息、第一指示信息以及第三指示信息。UE1的漫游区域中的AS1根据业务优先级处理策略以及第三指示信息，确定由归属地AS优先提供呼叫增值业务在，则不触发漫游地业务处理流程。
基于图9所示方法，UE1在漫游区域发起invite消息后，漫游区域中的P-CSCF设备可以将UE1发起的invite消息路由到UE1的漫游区域中的IMS网络，由漫游区域中的AS确定是否为UE1提供呼叫增值业务。同时，为避免漫游区域中的AS以及归属地AS同时为UE1提供呼叫增值业务带来的业务冲突，在invite消息对应的响应消息返回给UE1的过程中将归属地AS分配的第三指示信息发送给漫游区域中的AS，以便漫游区域中的AS根据第三指示信息以及业务优先级处理策略，确定由归属地AS优先提供呼叫增值业务后，不触发漫游地业务处理流程。
上述主要从各个节点之间交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，各个节点，例如密钥管理网元为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的算法步骤，本申请实施例的方法能够以硬件、软件、或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对密钥管理网元进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
图10示出了一种装置100的结构图，该装置100可以为第一CSCF设备、第一CSCF设备中的芯片、片上系统或者其他能够实现上述方法中第一CSCF设备的功能的装置等，该 装置100可以用于执行上述方法实施例中涉及的第一CSCF设备的功能。作为一种可实现方式，图10所示装置100包括：接收单元1001、处理单元1002；
接收单元1001，用于接收第一通信消息，第一通信消息包含第一呼叫信令，第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备。例如，接收单元1001可以用于支持装置100执行S401、S802、S902。
处理单元1002，用于基于第一通信消息使第一呼叫信令被路由到漫入用户设备的漫游地AS，漫游地AS为第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS。例如，处理单元1002可以用于支持装置100执行S402、S802-S804、以及S902-S904。
具体的，上述图4-图9所示方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。装置100用于执行图4-图9所示方法所示呼叫方法中第一CSCF设备的功能，因此可以达到与上述呼叫方法相同的效果。
在本实施例中，该装置100还可以采用集成的方式划分各个功能模块的形式来呈现。这里的“功能模块”可以指专用集成电路(application specific integrated circuit，ASIC)，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该装置100中的处理单元1001的功能/实现过程可以通过处理器调用存储器中保存的计算机执行指令来实现。图10中的收发单元1002的功能/实现过程可以通过信接口来实现。例如，作为又一种可实现方式，上述装置100可以采用图14所示的组成结构。
图11示出了一种装置110的结构图，该装置110可以为第二CSCF设备、第二CSCF设备中的芯片、片上系统或者其他能够实现上述方法中第二CSCF设备的功能的装置等，该装置110可以用于执行上述方法实施例中涉及的第二CSCF设备的功能。作为一种可实现方式，图11所示装置110包括：接收单元1101、处理单元1102；
接收单元110，用于接收来自第一CSCF设备的第二通信消息，第二通信消息包含第一呼叫信令，第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备。例如，接收单元1001用于支持装置110执行S402(c)、S805、S905。
处理单元1102，用于基于第二通信消息使第一呼叫信令被路由到漫入用户设备的漫游地AS，漫游地AS为第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS。例如，处理单元1102用于支持装置110执行S402(c)、S805、S905。
具体的，上述图4-图9所示方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。装置110用于执行图4-图9所示方法所示呼叫方法中第二CSCF设备的功能，因此可以达到与上述呼叫方法相同的效果。
在本实施例中，该装置110还可以采用集成的方式划分各个功能模块的形式来呈现。这里的“功能模块”可以指专用集成电路(application specific integrated circuit，ASIC)，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该装置110中的处理单元1101的功能/实现过程可以通过处理器调用存储器中保存的计算机执行指令来实现。图11中的收发单元1102的功能/实现过程可以通过信接口来实现。例如，作为又一种可实现方式，上述装置110可以采用图14所示的组成结构。
图12示出了一种装置120的结构图，该装置120可以为漫游地AS、漫游地AS中的芯 片、片上系统或者其他能够实现上述方法中漫游地AS的功能的装置等，该装置120可以用于执行上述方法实施例中涉及的漫游地AS的功能。作为一种可实现方式，图12所示装置120包括：接收单元1201、处理单元1202；
接收单元1201，用于接收来自第一呼叫会话控制功能CSCF设备或者第二CSCF设备的第二通信消息；第二通信消息包含第一呼叫信令，第一呼叫信令的发起方或者接收方为第一CSCF设备或第二CSCF设备的漫入用户设备。例如，接收单元1201可以支持装置120执行S403、S806。
处理单元1202，基于第二通信消息为漫入用户设备提供呼叫增值业务。例如，处理单元1202可以支持装置120执行S403、S806。
具体的，上述图4-图9所示方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。装置120用于执行图4-图9所示方法所示呼叫方法中漫游地AS的功能，因此可以达到与上述呼叫方法相同的效果。
在本实施例中，该装置120还可以采用集成的方式划分各个功能模块的形式来呈现。这里的“功能模块”可以指专用集成电路(application specific integrated circuit，ASIC)，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该装置120中的处理单元1201的功能/实现过程可以通过处理器调用存储器中保存的计算机执行指令来实现。图12中的收发单元1202的功能/实现过程可以通过信接口来实现。例如，作为又一种可实现方式，上述装置120可以采用图14所示的组成结构。
图13示出了一种装置130的结构图，该装置130可以为归属地AS、归属地AS中的芯片、片上系统或者其他能够实现上述方法中归属地AS的功能的装置等，该装置130可以用于执行上述方法实施例中涉及的归属地AS的功能。作为一种可实现方式，图13所示装置130包括：接收单元1301、处理单元1302；
接收单元1301，用于接收来自第三呼叫会话控制功能CSCF设备的第七通信消息；第七通信消息包含第一呼叫信令，第一呼叫信令的发起方或者接收方为第三CSCF设备的归属用户设备；例如，接收单元1301用于支持装置130执行S506、S810、S910。
处理单元1302，用于基于第七通信消息使第一呼叫信令或者第一呼叫信令对应的呼叫业务的第二呼叫信令被路由至第一AS，第一AS为归属用户设备的漫游区域的AS。例如，处理单元1302用于支持装置130执行S506、S810、S910。
具体的，上述图4-图9所示方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。装置130用于执行图4-图9所示方法所示呼叫方法中归属地AS的功能，因此可以达到与上述呼叫方法相同的效果。
在本实施例中，该装置130还可以采用集成的方式划分各个功能模块的形式来呈现。这里的“功能模块”可以指专用集成电路(application specific integrated circuit，ASIC)，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该装置130中的处理单元1301的功能/实现过程可以通过处理器调用存储器中保存的计算机执行指令来实现。图13中的收发单元1302的功能/实现过程可以通过信接口来实现。例如，作为又一种可实现方式，上述装置130可以采用图14所示的组成结构。
作为又一种可实现方式，上述第一CSCF设备、第二CSCF设备、漫游地AS以及归属地AS可以采用图14所示的组成结构，或者包括图14所示的部件。图14为本申请实施例提供的一种装置140的组成示意图，该装置140可以为第一CSCF设备、第二CSCF设备、漫游地AS以及归属地AS，或者第一CSCF设备、第二CSCF设备、漫游地AS以及归属地AS中的芯片、片上系统或者其他能够实现上述方法中第一CSCF设备、第二CSCF设备、漫游地AS以及归属地AS的功能的装置等。如图14所示，该装置140可以包括处理器1401，通信线路1402以及通信接口1403。进一步的，该装置140还可以包括存储器1404。其中，处理器1401，存储器1404以及通信接口1403之间可以通过通信线路1402连接。其中，处理器1401可以集成上述处理单元1002、处理单元1102、处理单元1202以及处理单元1302的功能。通信接口1403可以集成上述接收单元1001、接收单元1101、接收单元1201以及接收单元1301的功能。
处理器1401，可以是中央处理器(central processing unit，CPU)、通用处理器、网络处理器(network processor，NP)、数字信号处理器(digital signal processing，DSP)、微处理器、微控制器、可编程逻辑器件(programmable logic device，PLD)或它们的任意组合。处理器1401还可以是其它具有处理功能的装置，如电路、器件或软件模块，不予限制。
通信线路1402，用于在装置140所包括的各部件之间传送信息。
通信接口1403，用于与其他设备或其它通信网络(如以太网，无线接入网(radio access network，RAN)，无线局域网(wireless local area networks，WLAN))等进行通信。通信接口1403可以是模块、电路、收发器、网络接口或者任何能够实现通信的装置。
存储器1404，用于存储指令。其中，指令可以是计算机程序。
其中，存储器1404可以是只读存储器(read-only memory，ROM)或可存储静态信息和/或指令的其他类型的静态存储设备，也可以是随机存取存储器(random access memory，RAM)或者可存储信息和/或指令的其他类型的动态存储设备，还可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟)、磁盘存储介质、其他磁存储设备，不予限制。
需要说明的是，存储器1404可以独立于处理器1401存在，也可以和处理器1401集成在一起。存储器1404可以用于存储指令或者程序代码或者一些数据等。存储器1404可以位于装置140内，也可以位于装置140外，不予限制。
处理器1401，用于执行存储器1404中存储的指令，以实现本申请下述实施例提供的呼叫方法。在一种示例中，处理器1401可以包括一个或多个CPU，作为一种可选的实现方式，装置140包括多个处理器。
作为一种可选的实现方式，装置140还包括输出设备1405和输入设备1406。示例性地，输入设备1406是键盘、鼠标、麦克风或操作杆等设备，输出设备1405是显示屏、扬声器(speaker)等设备。
需要说明的是，装置140可以是台式机、便携式电脑、网络服务器、移动手机、平板电脑、无线终端、嵌入式设备、芯片系统或有图14中类似结构的设备。此外，图14中示出的组成结构并不构成对该通信装置的限定，除图14所示部件之外，该通信装置可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
本申请实施例中，芯片系统可以由芯片构成，也可以包括芯片和其他分立器件。
本申请实施例还提供了一种计算机可读存储介质。上述方法实施例中的全部或者部分流程可以由计算机程序来指令相关的硬件完成，该程序可存储于上述计算机可读存储介质中，该程序在执行时，可包括如上述各方法实施例的流程。计算机可读存储介质可以是前述任一实施例的终端装置，如：包括数据发送端和/或数据接收端的内部存储单元，例如终端装置的硬盘或内存。上述计算机可读存储介质也可以是上述终端装置的外部存储设备，例如上述终端装置上配备的插接式硬盘，智能存储卡(smart media card，SMC)，安全数字(secure digital，SD)卡，闪存卡(flash card)等。进一步地，上述计算机可读存储介质还可以既包括上述终端装置的内部存储单元也包括外部存储设备。上述计算机可读存储介质用于存储上述计算机程序以及上述终端装置所需的其他程序和数据。上述计算机可读存储介质还可以用于暂时地存储已经输出或者将要输出的数据。
本申请实施例还提供了一种计算机指令。上述方法实施例中的全部或者部分流程可以由计算机指令来指令相关的硬件(如计算机、处理器、网络设备、和终端等)完成。该程序可被存储于上述计算机可读存储介质中。
应理解，在本申请实施例中，“与A对应的B”表示B与A相关联。例如，可以根据A可以确定B。还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。此外，本申请实施例中出现的“连接”是指直接连接或者间接连接等各种连接方式，以实现设备间的通信，本申请实施例对此不做任何限定。
在本申请的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；本申请实施例中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况，其中A,B可以是单数或者复数。并且，在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a-b，a-c，b-c，或a-b-c，其中a，b，c可以是单个，也可以是多个。另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。同时，在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念，便于理解。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。
在本申请所提供的几个实施例中，应该理解到，所揭露的装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述模块或单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结 合或者可以集成到另一个装置，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或也可以不是物理上分开的，作为单元显示的部件可以是一个物理单元或多个物理单元，即可以位于一个地方，或者也可以分布到多个不同地方。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个可读取存储介质中。基于这样的理解，本申请实施例的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该软件产品存储在一个存储介质中，包括若干指令用以使得一个设备，如：可以是单片机，芯片等，或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何在本申请揭露的技术范围内的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (34)

  1. 一种呼叫方法，应用于第一呼叫会话控制功能CSCF设备，其特征在于，所述方法包括：
    接收第一通信消息，所述第一通信消息包含第一呼叫信令，所述第一呼叫信令的发起方或者接收方为所述第一CSCF设备的漫入用户设备；
    基于所述第一通信消息使所述第一呼叫信令被路由到所述漫入用户设备的漫游地应用服务器AS，所述漫游地AS为所述第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS。
  2. 根据权利要求1所述的方法，其特征在于，所述基于所述第一通信消息使所述第一呼叫信令被路由到所述漫入用户设备的漫游地应用服务器AS，包括：
    基于所述第一通信消息确定所述第一呼叫信令的发起方或者接收方为所述第一CSCF设备的漫入用户设备；
    使所述第一呼叫信令被路由到所述漫游地AS。
  3. 根据权利要求2所述的方法，其特征在于，所述使所述第一呼叫信令被路由到所述漫游地AS，包括：
    向所述第一CSCF设备的归属区域中的第二CSCF设备或所述漫游地AS发送第二通信消息，所述第二通信消息包含所述第一呼叫信令和第一指示信息，所述第一指示信息指示所述第一呼叫信令的发起方或者接收方为所述第一CSCF设备的漫入用户设备。
  4. 根据权利要求3所述的方法，其特征在于，所述第一指示信息还指示使所述第一呼叫信令或者所述第一呼叫信令对应的呼叫业务的第二呼叫信令被路由到所述漫入用户设备的漫游地AS。
  5. 根据权利要求3或4所述的方法，其特征在于，所述方法还包括：
    将所述第一指示信息与所述第一呼叫信令对应的呼叫业务或通信会话对应存储。
  6. 根据权利要求3-5任一所述的方法，其特征在于，所述第二通信消息中还包含所述第二CSCF设备的地址信息，以使所述第二通信消息被路由到所述第二CSCF设备。
  7. 根据权利要求2-6任一所述的方法，其特征在于，所述基于所述第一通信消息确定所述第一呼叫信令的发起方或者接收方为所述第一CSCF设备的漫入用户设备，包括：
    基于所述第一通信消息中的来自头域或断言身份头域，确定所述第一呼叫信令的发起方为所述第一CSCF设备的漫入用户设备；或者，
    基于所述第一通信消息中的到达to头域，确定所述第一呼叫信令的接收方为所述第一CSCF设备的漫入用户设备。
  8. 根据权利要求1-7任一所述的方法，其特征在于，所述方法还包括：
    接收所述漫游地AS发送的第三通信消息，所述第三通信消息包含所述第一呼叫信令、所述第一指示信息和第二指示信息，所述第二指示信息用于指示所述漫游地AS将为所述漫入用户设备提供呼叫增值业务；或者，所述第二指示信息用于指示所述漫游地AS已经为所述漫入用户设备提供呼叫增值业务；
    向所述漫入用户设备的归属区域的第三CSCF设备发送第四通信消息，所述第四通信消息包含所述第一呼叫信令、所述第一指示信息和所述第二指示信息。
  9. 根据权利要求8所述的方法、其特征在于，所述方法还包括：
    从所述第三CSCF设备接收第五通信消息，所述第五通信消息包含所述第一指示信息和第三指示信息，所述三指示信息用于指示所述漫入用户设备的归属地AS将为所述漫入用户设备提供呼叫增值业务；
    根据所述第一指示信息，向所述漫游地AS发送第六通信消息，所述第六消息包括所述第一指示信息以及所述第三指示信息。
  10. 根据权利要求8所述的方法，其特征在于，所述方法还包括：
    从所述第三CSCF设备接收第五通信消息，所述第五通信消息包含所述第一指示信息和所述第二指示信息；
    根据所述第一指示信息，向所述漫游地AS发送第六通信消息，所述第六消息包括所述第一指示信息以及所述第二指示信息。
  11. 根据权利要求1-10任一项所述的方法，其特征在于，在基于所述第一通信消息使所述第一呼叫信令被路由到所述漫游地AS之前，所述方法还包括：
    确定所述漫入用户设备具备使用所述第一CSCF设备的归属区域中的AS提供的呼叫增值业务的能力。
  12. 根据权利要求3-11一所述的方法，其特征在于，所述第一CSCF设备的归属区域中的第二CSCF设备为所述第一CSCF设备的归属区域中的查询-呼叫会话功能I-CSCF设备或者服务-呼叫会话控制功能S-CSCF设备。
  13. 根据权利要求1-12任一项所述的方法，其特征在于，所述第一CSCF设备为代理-呼叫会话控制功能P-CSCF设备。
  14. 一种呼叫方法，应用于第二呼叫会话控制功能CSCF设备，其特征在于，所述方法包括：
    接收来自第一呼叫会话控制功能CSCF设备的第二通信消息，所述第二通信消息包含第一呼叫信令，所述第一呼叫信令的发起方或者接收方为所述第一CSCF设备的漫入用户设备；
    基于所述第二通信消息使所述第一呼叫信令被路由到所述漫入用户设备的漫游地应用服务器AS，所述漫游地AS为所述第一CSCF设备的归属区域中具备为用户设备提供呼叫增值业务的能力的AS。
  15. 根据权利要求14所述的方法，其特征在于，所述第二通信消息还包含第一指示信息，所述第一指示信息用于指示所述第一呼叫信令的发起方或者接收方为所述第一CSCF设备的漫入用户设备；所述基于所述第二通信消息使所述第一呼叫信令被路由到所述漫入用户设备的漫游地应用服务器AS，包括：
    根据所述第一指示信息，向所述漫游地AS发送所述第二通信消息。
  16. 根据权利要求15所述的方法，其特征在于，所述第一指示信息还指示使所述第一呼叫信令或者所述第一呼叫信令对应的呼叫业务的第二呼叫信令被路由到所述漫入用户设备的漫游地AS。
  17. 根据权利要求15或16所述的方法，其特征在于，所述方法还包括：
    将所述第一指示信息与所述第一呼叫信令对应的呼叫业务或通信会话对应存储。
  18. 根据权利要求15-17任一所述的方法，其特征在于，
    所述第二通信消息还包含所述第二CSCF设备的地址信息，以使得所述第二通信消息被路由到所述第二CSCF设备。
  19. 根据权利要求14-18任一所述的方法，其特征在于，所述方法还包括：
    接收所述漫游地AS发送的第三通信消息，所述第三通信消息包含所述第一呼叫信令、所述第一指示信息和第二指示信息，所述第二指示信息用于指示所述漫游地AS将为所述漫入用户设备提供呼叫增值业务，或者，所述第二指示信息用于指示所述漫游地AS已经为所述漫入用户设备提供呼叫增值业务；
    向所述漫入用户设备的归属区域中的第三CSCF设备发送第四通信消息，所述第四通信消息包含所述第一呼叫信令、所述第一指示信息和所述第二指示信息。
  20. 根据权利要求19所述的方法，其特征在于，所述方法还包括：
    从所述第三CSCF设备接收第五通信消息，所述第五通信消息包含所述第一指示信息和第三指示信息，所述三指示信息用于指示所述漫入用户设备的归属地AS将为所述漫入用户设备提供呼叫增值业务；
    根据所述第一指示信息，向所述漫游地AS发送第六通信消息，所述第六消息包括所述第一指示信息以及所述第三指示信息。
  21. 根据权利要求19所述的方法，其特征在于，所述方法还包括：
    从所述第三CSCF设备接收第五通信消息，所述第五通信消息包含所述第一指示信息和所述第二指示信息；
    根据所述第一指示信息，向所述漫游地AS发送第六通信消息，所述第六消息包括所述第一指示信息以及所述第二指示信息。
  22. 根据权利要求14-21任一所述的方法，其特征在于，所述第二CSCF设备为所述第一CSCF设备的归属区域中的查询-呼叫会话功能I-CSCF设备或所述第二CSCF设备的归属区域中的服务-呼叫会话控制功能S-CSCF设备。
  23. 一种呼叫方法，应用于第一应用服务器AS，其特征在于，所述方法包括：
    接收来自第一呼叫会话控制功能CSCF设备或者第二CSCF设备的第二通信消息；所述第二通信消息包含第一呼叫信令，所述第一呼叫信令的发起方或者接收方为所述第一CSCF设备或所述第二CSCF设备的漫入用户设备；
    基于所述第二通信消息为所述漫入用户设备提供呼叫增值业务。
  24. 根据权利要求23所述的方法，其特征在于，所述第二通信消息还包含第一指示信息，所述第一指示信息用于指示所述第一呼叫信令的发起方或者接收方为所述第一CSCF设备的漫入用户设备。
  25. 根据权利要求24所述的方法，其特征在于，所述第一指示信息还指示使所述第一呼叫信令或者所述第一呼叫信令对应的呼叫业务的第二呼叫信令被路由到所述第一AS。
  26. 根据权利要求24或25所述的方法，其特征在于，所述方法还包括：
    将所述第一指示信息与所述第一呼叫信令对应的呼叫业务或通信会话对应存储。
  27. 根据权利要求23-26任一所述的方法，其特征在于，所述基于所述第二通信消息为所述漫入用户设备提供呼叫增值业务，包括：
    响应于所述第二通信消息，为所述漫入用户设备提供呼叫增值业务；
    向所述第二CSCF设备发送第三通信消息，所述第三通信消息包含所述第一呼叫信令、所述第一指示信息和第二指示信息，所述第二指示信息指示所述第一AS已经为所述漫入用户设备提供呼叫增值业务。
  28. 根据权利要求23-26任一所述的方法，其特征在于，所述基于所述第二通信消息所述漫入用户设备提供呼叫增值业务，包括：
    响应于所述第二通信消息，向所述第二CSCF设备发送第三通信消息，所述第三通信消息 包含所述第一呼叫信令、所述第一指示信息和第二指示信息，所述第二指示信息指示所述第一AS将为所述漫入用户设备提供呼叫增值业务；
    从所述第二CSCF设备接收第六通信消息，所述第六通信消息包含所述第一呼叫信令、所述第一指示信息和第三指示信息，所述第三指示信息指示所述漫入用户设备的归属地AS将为所述漫入用户设备提供呼叫增值业务；
    响应于所述第六通信消息，向所述漫入用户设备提供呼叫增值业务。
  29. 一种呼叫方法，应用于第二应用服务器AS，其特征在于，所述方法包括：
    接收来自第三呼叫会话控制功能CSCF设备的第七通信消息；所述第七通信消息包含第一呼叫信令，所述第一呼叫信令的发起方或者接收方为所述第三CSCF设备的归属用户设备；
    基于所述第七通信消息使所述第一呼叫信令或者所述第一呼叫信令对应的呼叫业务的第二呼叫信令被路由至第一AS，所述第一AS为所述归属用户设备的漫游区域的AS。
  30. 根据权利要求29所述的方法，其特征在于，所述第七通信消息还包含第一指示信息，所述第一指示信息用于指示所述第一呼叫信令的发起方或者接收方为第一CSCF设备的漫入用户设备，所述第一CSCF设备为所述归属用户设备的漫游区域中的CSCF设备。
  31. 根据权利要求30所述的方法，其特征在于，所述第一指示信息还指示使所述第一呼叫信令或者所述第一呼叫信令对应的呼叫业务的第二呼叫信令被路由到所述归属用户设备的漫游地AS。
  32. 根据权利要求30或31所述的方法，其特征在于，所述方法还包括：
    将所述第一指示信息与所述第一呼叫信令对应的呼叫业务或通信会话对应存储。
  33. 根据权利要求29-31任一所述的方法，其特征在于，所述基于所述第七通信消息使所述第一呼叫信令或者所述第一呼叫信令对应的呼叫业务的第二呼叫信令被路由至第一AS，包括：
    响应于所述第七通信消息，向所述第三CSCF设备发送第八通信消息，包含所述第一呼叫信令、所述第一指示信息和第三指示信息，所述第三指示信息指示所述第二AS将为所述漫入用户设备提供呼叫增值业务。
  34. 根据权利要求29-31任一所述的方法，其特征在于，所述基于所述第七通信消息使所述第一呼叫信令或者所述第一呼叫信令对应的呼叫业务的第二呼叫信令被路由至第一AS，包括：
    响应于所述第七通信消息，向所述第三CSCF设备发送第八通信消息，包含所述第一呼叫信令、所述第一指示信息。
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