CN106941669B

CN106941669B - Wireless communication method and P-CSCF (proxy Call Session control function) equipment

Info

Publication number: CN106941669B
Application number: CN201710113369.7A
Authority: CN
Inventors: 王国伟; 杨晟; 孙永勤
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-02-28
Filing date: 2017-02-28
Publication date: 2020-01-31
Anticipated expiration: 2037-02-28
Also published as: CN106941669A

Abstract

The application provides a wireless communication method and a P-CSCF device, the method comprises the steps that a P-CSCF device in an enterprise IMS network receives a INVITE message sent by a mobile terminal, the INVITE message contains an identification of a called second mobile terminal, the P-CSCF device routes a call to the second mobile terminal through an S-CSCF device in the enterprise IMS network under the condition that the identification of the second mobile terminal belongs to an internal identification in the enterprise IMS network, and the P-CSCF device routes the call to the second mobile terminal through the S-CSCF device in the operator IMS network under the condition that the identification of the second mobile terminal does not belong to the internal identification in the enterprise IMS network.

Description

Wireless communication method and P-CSCF (proxy Call Session control function) equipment

Technical Field

The present application relates to the field of wireless communications, and more particularly, to wireless communication methods and proxy call session control function (P-CSCF) devices.

Background

With the development of Internet Protocol (IP) technology, IP PBX systems have been introduced on the basis of conventional PBX systems, which can integrate voice communications into the company's data network, thereby enabling the establishment of voice and data networks for the enterprise internal systems .

The main advantage of the PBX/IP-PBX solution is that intra-enterprise calls do not need to go through the public telecommunication network provided by the operator, i.e. the operator is not aware of intra-enterprise calls and does not charge any fees for such calls. However, the conventional PBX/IP-PBX system is designed for a fixed terminal (e.g., a landline) inside an enterprise, and can only solve the communication requirement of the fixed terminal inside the enterprise. With the development of technology, the requirement of using mobile terminals for voice communication inside enterprises is more and more strong, and the traditional PBX/IP-PBX system cannot support the voice communication requirement of the mobile terminals.

Disclosure of Invention

The application provides wireless communication methods and P-CSCF devices, which can realize the functions similar to IP-PBX based on wireless network.

, providing wireless communication methods, including that a 0P-CSCF device in an enterprise IMS network receives a INVITE message sent by a mobile terminal, the mobile terminal is a registered terminal of the enterprise IMS network and an operator IMS network, the INVITE message includes an identifier of a called second mobile terminal, the P-CSCF device routes a call to the second mobile terminal through a S-CSCF device of a serving call session control function in the enterprise IMS network according to the INVITE message if the identifier of the second mobile terminal belongs to an internal identifier in the enterprise IMS network, and the P-CSCF device routes the call to the second mobile terminal through the S-CSCF device of the operator IMS network according to the INVITE message if the identifier of the second mobile terminal does not belong to the internal identifier in the enterprise IMS network.

The present solution modifies the functionality of a P-CSCF device (e.g., the P-CSCF device mentioned above) for an enterprise IMS network to have a "call proxy function", specifically, if the P-CSCF device in the enterprise IMS network recognizes that the number of the called terminal (i.e., the second mobile terminal) is an internal identifier of the enterprise IMS network, the call is routed to the called terminal by an S-CSCF device in the enterprise IMS network, and the entire call process is performed inside the enterprise IMS network without passing through the operator IMS network, in other words, the operator IMS network is unaware of the call process inside the enterprise IMS network, and does not charge a corresponding fee, step , if the number of the called terminal is an IMPU, the call is routed to the called terminal by the S-CSCF device in the operator IMS network, thereby achieving communication between the mobile terminal in the enterprise IMS network and the mobile terminal in the enterprise IMS operator network, and this case requires the use of a PBX network, the operator can charge the mobile terminal according to the rules of the operator , and the above-mentioned conventional wireless call process is similar to the IP network.

With reference to the aspect, in some implementations of the aspect, before the 0P-CSCF device receives the INVITE message sent by the mobile terminal, the method further includes the P-CSCF device receiving the REGISTER message sent by the mobile terminal, and the P-CSCF device registering the mobile terminal to the operator IMS network and the enterprise IMS network according to the REGISTER message.

Specifically, after the P-CSCF device in the enterprise IMS network receives a REGISTER message (also referred to as a registration message or a registration request) of the mobile terminal, the P-CSCF device REGISTERs the mobile terminal to the operator IMS network as well as the operator IMS network, so that the mobile terminal can use the operator IMS network and the enterprise IMS network at the same time, and can roam between the enterprise IMS network and the operator IMS network.

With reference to the aspect, in certain implementations of the aspect, the 0REGISTER message is used to REGISTER in the operator IMS network, the P-CSCF device REGISTERs the mobile terminal to the operator IMS network and the enterprise IMS network according to the REGISTER message, including the P-CSCF device forwarding the 5REGISTER message to an S-CSCF device of the operator IMS network, the P-CSCF device receiving a response message sent by the operator IMS network, the response message indicating that the registration of the mobile terminal in the operator IMS network is successful, the P-CSCF device forwarding the response message to the mobile terminal, the mobile terminal P-CSCF device forwards the P-CSCF device to the enterprise IMS network after the registration of the operator IMS network is successful, and the 68692 mobile terminal sending the second IMS REGISTER message to the enterprise IMS network.

After a mobile terminal (i.e., an th mobile terminal) in an enterprise IMS network initiates a registration process of an operator IMS network, a P-CSCF device (i.e., a th P-CSCF device) in the enterprise IMS network first registers the mobile terminal to the operator IMS network, and then the P-CSCF device triggers a proxy registration function to automatically initiate a registration process of the mobile terminal to the enterprise IMS network, so as to register the mobile terminal to the enterprise IMS network.

In some implementations of aspect in combination with aspect , the IMPU carried in the second REGISTER message is the same as the IMPU carried in the th response message.

With reference to the st aspect, in some implementations of the st aspect, the IMPU carried in the th response message includes an IMPU in the SIP format of the session initiation protocol, and the IMPI carried in the second REGISTER message includes the remaining characters except for the target character in the IMPU in the SIP format, where the target character is SIP: +.

The IMPI and the IMPU corresponding to the second REGISTER message are generated directly based on the IMPU carried in the -th response message, which is simple to implement and does not need to generate the IMPI and the IMPU again based on the IMSI.

With reference to the aspect, in certain implementations of the aspect, the IMS networks of the enterprise include a 0 th IMS network and a second IMS network, S-CSCF devices of the enterprise IMS network are located in the 1 th IMS network, P-CSCF devices of the 2 th IMS network and P-CSCF devices of the second IMS network are both connected to S-CSCF devices of the th IMS network, the th P-CSCF device is any P-CSCF device of the th IMS network and the second IMS network, and the th P-CSCF device and the th mobile terminal are located in the same IMS network of the th IMS network and the second IMS network.

With reference to the aspect, in some implementations of the aspect, the 0 th mobile terminal and the second mobile terminal are located in the same IMS network of the IMS network and the second IMS network, and the th P-CSCF device routes the call to the second mobile terminal through the S-CSCF device in the enterprise IMS network according to the th INVITE message, where the forwarding of the th INVITE message by the th P-CSCF device to the S-CSCF device in the enterprise IMS network includes the forwarding of the th INVITE message by the th P-CSCF device to the second INVITE message sent by the S-CSCF device in the enterprise IMS network, and the second INVITE message includes an IMPU of the second mobile terminal, and the routing of the call to the second mobile terminal by the th P-CSCF device according to the IMPU of the second mobile terminal.

With reference to the aspect, in certain implementation manners of the aspect, the 0 th mobile terminal is located in the second IMS network, the th P-CSCF device is a P-CSCF device of the second IMS network, the method further includes the th P-CSCF device receiving a third INVITE message sent by an S-CSCF device of the th IMS network, where the third INVITE message is an INVITE message corresponding to a call initiated by a third mobile terminal of the th IMS network, and the third INVITE message includes an IMPU of the th mobile terminal, and the th P-CSCF device routes the call initiated by the third mobile terminal to the th mobile terminal according to the IMPU of the th mobile terminal.

In a second aspect, wireless communication methods are provided, including that a P-CSCF device receives a REGISTER message sent by a mobile terminal, the P-CSCF device is a P-CSCF device of an enterprise IMS network, and the P-CSCF device REGISTERs the mobile terminal to an operator IMS network and the enterprise IMS network according to the REGISTER message.

With reference to the second aspect, in some implementations of the second aspect, the th REGISTER message is used for registering in an operator IMS network, the th P-CSCF device REGISTERs the 1 th mobile terminal to the operator IMS network and an enterprise IMS network according to the 0 th REGISTER message, including the 2 th P-CSCF device forwarding the 3 th REGISTER message to an S-CSCF device of the operator IMS network, the 4 th P-CSCF device receiving a 5 th response message sent by the operator IMS network, the 6 th response message being used to indicate that the th mobile terminal successfully REGISTERs in the operator IMS network, the th P-CSCF device forwarding the th response message to the th mobile terminal, the th mobile terminal after the IMS operator IMS network successfully REGISTERs, the th P-CSCF device sending the second REGISTER message to the S-CSCF device of the enterprise network, and the th P-CSCF device sending the second REGISTER message in response to the enterprise IMS network, and the receiving the second REGISTER message by the enterprise IMS network.

With reference to the second aspect, in some implementations of the second aspect, the IMPU carried in the second REGISTER message is the same as the IMPU carried in the th response message.

With reference to the second aspect, in some implementations of the second aspect, the IMPU carried in the th response message includes an IMPU in a session initiation protocol, SIP, format, and the IMPI carried in the second REGISTER message includes a remaining character of the IMPU in the SIP format except for a target character, where the target character is SIP: +.

With reference to the second aspect, in some implementations of the second aspect, the IMS networks of the enterprise include an th IMS network and a second IMS network, the S-CSCF device of the IMS network of the enterprise is located in the th IMS network, the P-CSCF device of the 0 th IMS network and the P-CSCF device of the second IMS network are both connected to the S-CSCF device of the th IMS network, the th P-CSCF device is any P-CSCF device of the th IMS network and the second IMS network, and the th P-CSCF device and the th mobile terminal belong to the same th IMS network of the th IMS network and the second IMS network.

In a third aspect, there is provided P-CSCF devices comprising means for performing the method of the above aspects.

In a fourth aspect, there is provided P-CSCF devices, comprising a memory for storing instructions and a processor for executing the instructions stored in the memory to perform the method of the above aspects.

In a fifth aspect, computer-readable storage media are provided, having stored therein instructions, which, when executed on a computer, cause the computer to perform the method of the above aspects.

In a sixth aspect, computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the above aspects is provided.

In some implementations described above, the mobile terminal is a UE, and may be a VoLTE terminal, for example.

In some of the above implementations, the IMPI and IMPU carried in the second REGISTER message are generated based on the IMSI of the th mobile terminal.

In some implementations described above, the th IMS network and the second IMS network are located in different countries.

Drawings

Fig. 1 is a schematic network structure diagram of an IMS network.

Fig. 2 is a schematic diagram of a networking mode of an enterprise IMS network according to embodiments of the present invention.

Fig. 3 is a schematic diagram of a networking mode of an enterprise IMS network according to embodiments of the present invention.

Fig. 4 is an exemplary diagram of an account opening model of a mobile terminal in an HSS of an operator IMS network according to an embodiment of the present invention.

Fig. 5 is an exemplary diagram of an account opening model of a mobile terminal in an HSS of an enterprise IMS network according to an embodiment of the present invention.

Fig. 6 is a schematic flow chart of a wireless communication method provided by an embodiment of the invention.

Fig. 7 is a schematic diagram of a detailed flow of step 620 in fig. 6.

Fig. 8 is a schematic diagram of a registration process provided by embodiments of the present invention.

Fig. 9 is a schematic diagram of a registration process according to another embodiment of the invention.

Fig. 10 is a diagram illustrating a registration process according to yet another embodiment of the present invention.

Fig. 11 is a schematic flow chart of a wireless communication method provided by an embodiment of the invention.

Fig. 12 is a schematic diagram of a call flow provided by embodiments of the present invention.

Fig. 13 is a schematic diagram of a call flow provided by another embodiment of the invention.

Fig. 14 is a schematic diagram of a call flow provided by yet another embodiment of the present invention.

Fig. 15 is a schematic diagram of a call flow provided by yet another embodiment of the present invention.

Fig. 16 is a schematic diagram of a call flow provided by yet another embodiment of the present invention.

Fig. 17 is a schematic diagram of a call flow provided by yet another embodiment of the invention.

Fig. 18 is a schematic structural diagram of a P-CSCF device provided by embodiments of the present invention.

Fig. 19 is a schematic block diagram of a P-CSCF device provided in another embodiment of the invention.

Fig. 20 is a schematic block diagram of a P-CSCF device provided by yet another embodiment of the present invention.

Fig. 21 is a schematic block diagram of a P-CSCF device provided by yet another embodiment of the present invention.

Detailed Description

The embodiment of the invention provides mobile network voice communication technologies suitable for the interior of an enterprise on the basis of an IP Multimedia Subsystem (IMS) network.

The IMS network is a standard defined by the third generation partnership project (3 GPP) for the next generation of networks, which is a network constructed based on the Session Initiation Protocol (SIP), and may have or more of the following capabilities, i.e., separation of a control function and a bearer function of a multimedia service, separation of a call and a session, separation of an application and a service, separation of a service and a network, and convergence of a mobile network service and an internet service.

AS shown in fig. 1, the IMS network is roughly divided into a visited network (called visited domain) and a home network (called home domain), and mainly includes or more of a mobile terminal (which may be a User Equipment (UE)), a Session Border Controller (SBC), a proxy call session control function (P-CSCF) device, an interrogating call session control function (I-CSCF) device, a serving call session control function (S-CSCF) device, a home subscriber server (home subscriber server, HSS), and an Application Server (AS), and the following functions are simply introduced for the convenience of understanding of the network elements.

The P-CSCF device is an interface point for connecting the mobile terminal to the IMS network, and is mainly used for functions such as SIP message forwarding of the mobile terminal and compression and decompression of SIP signaling messages. The P-CSCF device may be a stand-alone network element or may be integrated on the SBC. The SBC may provide functions such as Network Address Translation (NAT) traversal, access control, quality of service (QoS) control, and the like between the access network and the IMS core network.

The I-CSCF device is mainly used for realizing the functions of routing and allocating the S-CSCF device, and after receiving a service request sent by the mobile terminal, the I-CSCF device can route the service request to different S-CSCF devices.

The S-CSCF device is in the core control position in the IMS network, and is mainly responsible for performing authentication and session control on the registration of the mobile terminal, and performing a call routing function between the calling terminal and the called terminal.

The AS may provide services in the IMS, such AS conference call services, etc., for the mobile terminal.

The HSS is a network element in the home network for holding subscription information of the mobile terminal. The subscription information of the mobile terminal mainly comprises an identifier of the mobile terminal, a security context of the mobile terminal, routing information of the mobile terminal, service subscription information of the mobile terminal and the like.

IMS networks are capable of providing voice services, which may also be referred to as volte (voice over LTE), based on LTE networks. VoLTE can carry voice traffic over LTE networks without falling back to 2G/3G networks. The mobile terminal using VoLTE may be referred to as a VoLTE terminal, and the VoLTE terminal may access to the IMS network through the LTE network, thereby implementing a call function between the mobile terminals through the LTE network.

In order to realize voice communication based on mobile terminals in an enterprise, the embodiment of the invention firstly introduces the concept of an enterprise IMS network, and the enterprise IMS network can be understood as an IMS network which is built for a certain enterprise by , so that enterprise employees can use the mobile terminals to carry out voice communication through the enterprise IMS network.

The embodiment of the invention does not specifically limit the application scene of the enterprise IMS network. For example, some enterprises have enterprise parks that are far from urban areas and do not have the coverage of the operator IMS network, such as the enterprise parks of mines, oil fields, logistics warehouses, etc. To meet the data and voice communication needs of employees in such enterprise parks, the enterprise may collaborate with a local operator, lease a portion of the operator's wireless frequency band, and deploy an enterprise IMS network within the enterprise park. Of course, the enterprise IMS network may also be deployed in a scenario covered by the operator IMS network, so as to improve convenience and security of communication between employees inside an enterprise.

Fig. 2 is a schematic diagram of a networking mode of an enterprise IMS network according to embodiments of the present invention, AS shown in fig. 2, an LTE network, such AS an evolved node B (eNB) and an Evolved Packet Core (EPC) device, may be deployed in an enterprise campus, step , an IMS network may be deployed on the basis of the LTE network, such AS network elements including a P-CSCF device, an I/S-CSCF device, an HSS, and an AS, the P-CSCF device in fig. 2 is independent network elements, alternatively, the P-CSCF device in fig. 2 may also be an SBC supporting a P-CSCF function, and such an SBC may also be referred to AS an SBC/P-CSCF combination device.

, the P-CSCF device of the enterprise IMS network can be connected to the I/S-CSCF device of the operator IMS network (e.g., can be connected via an IP dedicated line) to enable communication between the mobile terminal of the enterprise IMS network and the mobile terminal of the operator IMS network.

Assuming that the enterprise IMS network shown in fig. 2 is an IMS network of an enterprise headquarters, and if the enterprise headquarters is located in country a, the operator IMS network shown in fig. 2 may be an IMS network provided by an operator in country a. step , in embodiments, assuming that the enterprise also has an enterprise campus in country B, and an enterprise-level IMS network also needs to be established in country B, a transnational IMS network may be established in the a and B parks of the enterprise in a networking manner AS shown in fig. 3. in order to ensure that the enterprise can freely communicate inside, a P-CSCF device may be deployed in the IMS network of the B campus and connected to an I/S-CSCF device of the a campus, and in addition, in embodiments of , it may not be necessary to deploy an I/S-CSCF device, an HSS, an AS, an network element, a HSS, or the like in country B, it may be desirable to deploy an I/S-CSCF device, an HSS, an AS a network element, an HSS, or the like in an embodiment of an enterprise campus, and it may be understood that the IMS network may be deployed in embodiments where two IMS networks are located in different countries, a plurality of the same country B networks, and the same country B-S networks may be located in different country, and the same country may be considered that the IMS networks may be located in embodiments of the same country B-S of the same country B network of the enterprise mobile terminal 3526, and may be located in an embodiment, and may be located in different country, and may be located in an embodiment of the same country B-S-B-S network.

As can be seen from the descriptions related to fig. 2 and fig. 3, the embodiment of the present invention provides communication mechanisms based on the IMS network for enterprise users, and the implemented functions of the communication mechanisms are similar to those of an IP-PBX, except that a conventional IP-PBX can only be used for a fixed terminal, and the embodiment of the present invention can be used for a mobile terminal in a wireless network, so that the technical solution provided by the embodiment of the present invention can be understood as novel wireless IP-PBX solutions.

A possible networking approach for an enterprise IMS network is described in detail above in connection with fig. 2 and 3. Before using the enterprise IMS network and the operator IMS network, the enterprise employee needs to open an account for the mobile terminal on the operator IMS network and the enterprise IMS network. After the account is opened, the enterprise employee can execute IMS registration through the mobile terminal, and the purpose of the IMS registration process is mainly to store the binding relationship between the IP address of the mobile terminal and the IMPU of the mobile terminal in the IMS network, so that the IMS network can locate the corresponding mobile terminal based on the binding relationship, and thus, the IMS service (such as a call service) is forwarded to the mobile terminal. After the registration is successful, the enterprise staff can use the mobile terminal to perform voice communication inside the enterprise IMS network and between the enterprise IMS network and the operator IMS network.

The account opening and registration processes are both closely related to the identifier (or called identity) of the mobile terminal, and for easy understanding, the type of the identifier of the mobile terminal is first described.

The identity of the mobile terminal includes an International Mobile Subscriber Identity (IMSI), a mobile subscriber ISDN/PSTN number (MSISDN), an IP Multimedia Private Identity (IMPI), an IP multimedia public Identity (IMPU), an ISDN temporary IMPU (T-IMPU), an ISDN in the above text indicating an integrated service digital network, i.e. an international integrated services digital network, and a PSTN indicating a public switched telephone network, i.e. a public switched telephone network, the above identity of the mobile terminal is described in connection with table .

TABLE

It is noted above that when an enterprise employee wishes to use an enterprise IMS network and wishes to be able to roam between the enterprise IMS network and the operator IMS network, the enterprise employee may open an account for the mobile terminal at the operator IMS network and the enterprise IMS network, respectively.

Fig. 4 shows examples of an opening model of a mobile terminal in the HSS of an operator IMS network, where the opening model records T-IMPU, IMPI, SIP formatted IMPU, and TEL formatted IMPU of the mobile terminal (VoLTE user). the mobile terminal may initiate IMS registration using the T-IMPU and carry the IMPI in a registration message for the IMS network to authenticate the mobile terminal.

Fig. 5 shows examples of the mobile terminal's account opening model in the HSS of the enterprise IMS network, which records the IMPI of the mobile terminal, the IMPU in SIP format, and the IMPU in TEL format.

Fig. 6 is a schematic flow chart of a wireless communication method provided by an embodiment of the invention. The method of fig. 6 focuses primarily on the IMS registration procedure. The method of FIG. 6 includes:

610. the th P-CSCF device receives the th REGISTER message sent by the th mobile terminal, and the th P-CSCF device is a P-CSCF device of the enterprise IMS network.

The mobile terminal herein may be, for example, a User Equipment (UE) further , and in embodiments, the mobile terminal herein may refer to a VoLTE terminal, i.e., a VoLTE-enabled terminal.

The th P-CSCF device herein may be a stand-alone device or an SBC supporting P-CSCF functionality, i.e. an SBC/P-CSCF and device.

Before IMS registration, an account may be opened for the th mobile terminal in the operator IMS network and the enterprise IMS network, and the user subscription information of the th mobile terminal may be stored in the HSS of the operator IMS network and the enterprise IMS network.

In embodiments, a REGISTER message may be used to trigger a th mobile terminal registration procedure with the operator IMS network.

620. The th P-CSCF device REGISTERs the th mobile terminal to the operator IMS network and the enterprise IMS network according to the th REGISTER message.

Alternatively, in embodiments, step 620 includes registering the th mobile terminal with the operator IMS network and the enterprise IMS network in response to the th REGISTER message.

The implementation manner of step 620 in this embodiment of the present invention is not specifically limited, for example, the th mobile terminal may be first registered in the enterprise IMS network, and then the th mobile terminal may be registered in the operator IMS network, or, for example, registration of the th mobile terminal in the enterprise IMS network and the operator IMS network may be initiated at the same time, or, for example, the th mobile terminal may be first registered in the operator IMS network according to a standard registration procedure, and after the registration is successful, the proxy registration function is triggered, and then the th mobile terminal is registered in the enterprise IMS network, which is described in detail below with reference to fig. 7.

Optionally, in embodiments, as shown in fig. 7, step 620 may include:

710. the th P-CSCF device forwards the th REGISTER message to the S-CSCF device of the operator IMS network.

Specifically, the th REGISTER message may carry the IMPI and T-IMPU of the th mobile terminal in the operator IMS network, for example, the T-IMPU of the th mobile terminal may be carried in the From/To header field of the th REGISTER message, and the IMPI of the th mobile terminal may be carried in the Authorization header field of the th REGISTER message, both of which may be generated based on the IMSI of the th mobile terminal, for example, the T-IMPU may be sip: < IMSI > @ IMS < mnc >. mcc.3 gppnek.org, and the IMPI may be IMSI > @ network.mc < mnc. mcc < mcc >.3 gppnek.org.

720. The th P-CSCF device receives a th response message sent by the operator IMS network, and the th response message is used for indicating that the th mobile terminal is successfully registered in the operator IMS network.

The response message of the th REGISTER message may be, for example, a 200OK message.

The th REGISTER message response message may include th mobile terminal's IMPU including SIP formatted IMPU and TEL formatted IMPU, for example SIP formatted IMPU is SIP: + < MSISDN > @ ims.mnc < mnc >. mcc < mcc >.3 gppnek.org, TEL formatted IMPU may be TEL: + < MSISDN >.

In , between steps 710 and 720, an authentication procedure of the operator IMS network for the th mobile terminal may be further performed, specifically, after step 710, the 0 th P-CSCF device may first forward the th REGISTER message to the S-CSCF device of the operator IMS network, then the th P-CSCF device may receive the 401 response message from the S-CSCF device of the operator IMS network and forward the 401 response message to the th mobile terminal, where the 401 response message is used to instruct the operator IMS network to initiate an authentication challenge to the th mobile terminal, then the th mobile terminal may perform an authentication process and send a REGISTER message to the th P-CSCF device again, where the REGISTER message may contain authentication response information, and after receiving the REGISTER message, the th P-CSCF device forwards the REGISTER message to the S-CSCF device of the operator IMS network, and the operator IMS network completes the authentication and registration procedure of the th mobile terminal, and then performs step 720.

730. The th P-CSCF device forwards the th response message to the th mobile terminal, informing the th mobile terminal operator that the IMS network registration is successful.

740. the P-CSCF device sends a second REGISTER message to the S-CSCF device of the enterprise IMS network after the operator IMS network registration is successful.

Optionally, in embodiments, the obtaining manner of the IMPI and/or IMPU carried in the second REGISTER message may be similar to the obtaining manner of the IMPI and/or IMPU carried in the REGISTER message, that is, the obtaining manner may be based on the IMSI of the th mobile terminal.

Optionally, in further embodiments, the P-CSCF device has already obtained the IMPU of the mobile terminal from the th response message, and therefore, the IMPU may be carried directly into the second REGISTER message, further, considering that the IMPI is similar to the IMPU in SIP format, and therefore, the IMPI in the second REGISTER message may also be obtained based on the IMPU in SIP format.

750. And the th P-CSCF device receives a second response message sent by the S-CSCF device of the enterprise IMS network, wherein the second response message is used for indicating that the th mobile terminal is successfully registered in the enterprise IMS network.

The response message of the second REGISTER message may be, for example, a 200OK message.

In the embodiment of the invention, after a mobile terminal (i.e. an th mobile terminal) in an enterprise IMS network initiates a registration process of an operator IMS network, a P-CSCF device (i.e. a th P-CSCF device) in the enterprise IMS network firstly registers the mobile terminal to the operator IMS network, then the P-CSCF device triggers a proxy registration function to automatically initiate the registration process of the mobile terminal to the enterprise IMS network and register the mobile terminal to the enterprise IMS network, and the registration process of the enterprise IMS network does not need the participation of the mobile terminal, thereby simplifying the operation of the mobile terminal.

Optionally, in embodiments, the enterprise IMS network includes a IMS network and a second IMS network, the S-CSCF device of the enterprise IMS network is located in the IMS network, and the P-CSCF device of the IMS network and the P-CSCF device of the second IMS network are both connected to the S-CSCF device in the IMS network.

Specifically, referring to fig. 3, the th IMS network may correspond to the IMS network of the country a campus in fig. 3, the second IMS network may correspond to the IMS network of the country B campus in fig. 3, and the two IMS networks of the enterprise share the same I/S-CSCF device.

, the P-CSCF device is any P-CSCF device of the IMS network and the second IMS network, and the P-CSCF device and the mobile terminal belong to the same IMS network of the IMS network and the second IMS network.

The IMS network to which the mobile terminal belongs is the IMS network of the home location of the mobile terminal , i.e., the IMS network selected when the mobile terminal opens an account P-CSCF device and the mobile terminal 2 belong to the same IMS network as IMS network, indicating that even if the mobile terminal moves to the visited location, the registration procedure of the mobile terminal is still performed in its home IMS network, taking fig. 3 as an example, assuming that the mobile terminal belongs to the IMS network of the country a, if the mobile terminal is currently located in the IMS network of the country B (i.e., the IMS network of the country B is the IMS network of the visited location), and initiates the registration procedure in the IMS network of the country B, a Mobility Management Entity (MME) of the country B (mobility management entity) will select the mobile terminal nety 2 (mobility management entity) when the mobile terminal is attached (EPC) to the EPC, and select the mobile terminal nety Gateway (GW) of the home location to be the same as the IMS network of the visited location based on the roaming rule , so that the IMS network can obtain the registration procedure of the home location of the mobile terminal 368, even if the IMS network is attached to the IMS network 368, the home location, the IMS network of the roaming enterprise can obtain the roaming gateway 358, the registration procedure of the roaming gateway, the roaming gateway of the roaming enterprise can be the roaming gateway 36639, so that the IMS network, the IMS network of the roaming gateway of the roaming enterprise can obtain the roaming gateway of the roaming enterprise can be the roaming gateway of the roaming gateway 368, even if the roaming gateway of the roaming enterprise can be the roaming gateway 368, the roaming gateway of.

Fig. 8 to 10 illustrate the registration process provided by the embodiment of the present invention in detail by taking the networking manner shown in fig. 3 as an example, and by taking fig. 8 to 10 as an example, the mobile terminal is a UE (for example, a VoLTE terminal), and the P-CSCF device is an SBC/P-CSCF combination device.

Fig. 8 is a schematic diagram of a registration process provided by embodiments of the present invention, in the embodiment of fig. 8, the UE belongs to the IMS network of the country a, that is, the IMS network of the country a is a home location of the UE, and the UE is currently located in the IMS network of the country a, and initiates the registration process in the IMS network of the country a.

The method of FIG. 8 includes:

802. the UE accesses the LTE network of the A country park and sends a REGISTER message to SBC/P-CSCF equipment in the IMS network of the A country park so as to initiate a registration process of the IMS network of the A country operator.

In particular, the REGISTER message may carry the IMPI and T-IMPU of the UE. For example, the T-IMPU of the UE may be carried in the From/To header field of the REGISTER message, and the IMPI of the UE in the a-country operator IMS network may be carried in the Authorization header field of the REGISTER message. Both the IMPI and the T-IMPU may be generated based on the IMSI of the UE, e.g., the T-IMPU may be: sip: < IMSI > @ ims.mnc < mnc >. mcc < mcc >.3 gppnetwork.org; the IMPI may be: < IMSI > @ ims.mnc < mnc >. mcc < mcc >.3gppnetwork.

804. The SBC/P-CSCF device in the IMS network of the country a forwards the REGISTER message to the I/S-CSCF device of the IMS network of the operator of country a.

806 + 808. the SBC/P-CSCF device in the campus a IMS network receives the 401 response message from the I/S-CSCF device of the operator IMS network of country a and forwards the 401 response message to the UE.

It should be noted that the 401 response message is used to instruct the a-country operator network to initiate an authentication challenge to the UE.

810 and 812, after the authentication processing, the UE sends a REGISTER message to the SBC/P-CSCF device in the IMS network of the country a again, and the REGISTER message carries authentication response information, and the SBC/P-CSCF device in the IMS network of the country a forwards the REGISTER message to the I/S-CSCF device of the IMS network of the country a operator.

814. The IMS network of the operator in A country completes the authentication and registration process, and sends 200OK information to the SBC/P-CSCF equipment in the IMS network of the park in A country through the I/S-CSCF equipment of the IMS network of the operator in A country.

The 200OK message may carry an IMPU in SIP format and an IMPU in TEL format of the UE, and the IMPU in SIP format and the IMPU in TEL format may take the following forms, for example:

SIP format IMPU: sip +< MSISDN > @ ims.mnc < mnc >. mcc < mcc >.3 gppnetwork.org;

TEL format IMPU: tel +< MSISDN >.

816. The SBC/P-CSCF device in the IMS network of the country A park forwards the 200OK message to the UE to inform the UE that the registration of the IMS network of the country A operator is successful.

818. SBC/P-CSCF equipment in the IMS network of the country A triggers a proxy registration function, and sends a REGISTER message to I/S-CSCF equipment in the IMS network of the country A so as to start a registration process from UE to the IMS network of the country A.

The IMPU carried in the REGISTER message may be the same as the IMPU obtained in step 814; the IMPI carried in the REGISTER message may remove "SIP: for the rest after the + still taking the example that the IMPU in SIP format obtained in step 814 is SIP: + < MSISDN > @ ims.mnc < mnc >. mcc < mcc >.3gppnetwork.org, the IMPI carried in step 818 may be < MSISDN > @ ims.mnc < mnc >. mcc < mcc >.3 gppnetwork.org.

820. And the I/S-CSCF equipment in the IMS network of the campus A sends a 200OK message to the SBC/P-CSCF equipment in the IMS network of the campus A.

After receiving the 200OK message, the SBC/P-CSCF device in the IMS network of country a completes the proxy registration function, registering the UE to the IMS network of operator a and the IMS network of country a. step, the SBC/P-CSCF device in the IMS network of country a may store the registration information of the UE, including the address of the S-CSCF device registered by the UE in the IMS network of country a, the address of the S-CSCF device registered in the IMS network of country a, the IMPU in SIP format, and the IMPU in TEL format, etc. the above information may be obtained from the 200OK message received in

steps

814 and 820. step, in some embodiments , after step 820, the SBC/P-CSCF device in the IMS network of country a may no longer forward the 200OK message to the UE, thereby shielding the proxy registration process of the IMS network of country a to the UE, the UE may determine that the SBC/P-CSCF device in the IMS network of country a has successfully registered according to step 816, and thus, the existing UE may implement a similar procedure to the existing UE .

Fig. 9 is a schematic diagram of a registration procedure provided in another embodiment of the present invention, in the embodiment of fig. 9, the UE belongs to an IMS network in a country a, that is, the IMS network in a country a is a home of the UE, the UE is currently located in an IMS network in a country B, that is, the IMS network in a country B is a visited place of the UE, and the UE initiates the registration procedure in the IMS network in a country B, when the UE initiates the registration procedure in the IMS network in a country B, the MME in a country B selects a packet data network gateway (P-GW) in the home place for the UE as a border gateway according to a roaming rule when the UE attaches (attach) to the EPC, so that the UE will attach to the EPC in the home place and acquire a P-CSCF device in the home IMS network, after the UE attaches to the EPC, initiate the registration procedure, and the subsequent registration procedure is the same as the registration procedure in the UE in the home place (i.e., the same as the registration procedure in fig. 8, and the detailed description is omitted here, so that even if the UE attaches to the home IMS network in the home location, the IMS network may also obtain an extension of IMS 19, the IMS network in the IMS , the IMS network in other IMS network, in other IMS networks.

FIG. 10 is a schematic diagram of a registration process provided by another embodiment of the present invention, where in the embodiment of FIG. 10, the UE belongs to a B-country park IMS network, that is, the B-country park IMS network is the home of the UE, and the UE initiates a registration process in the B-country park IMS network, FIG. 10 is substantially similar to the process of FIG. 8, except that the proxy registration function of the UE is performed by an SBC/P-CSCF device in the B-country park IMS network, and the SBC/P-CSCF device in the B-country park IMS network needs to communicate with an I/S-CSCF device in the A-country park IMS network when performing the proxy registration function because the B-country park IMS network does not deploy an I/S-CSCF device.

The IMS registration procedure according to an embodiment of the present invention is described in detail above with reference to fig. 6 to 10, and the call flow according to an embodiment of the present invention is described in detail below with reference to fig. 11 to 17.

Fig. 11 is a schematic flow chart of a wireless communication method provided by an embodiment of the invention. The method of fig. 11 focuses on the call flow of the mobile terminal. The method of FIG. 11 includes:

1110. an th P-CSCF device in the IMS network receives a th INVITE message sent by a th mobile terminal, the th mobile terminal is a registered terminal of an enterprise IMS network and an operator IMS network, and the th INVITE message contains an identifier of a called second mobile terminal.

The th mobile terminal is a registration terminal of an enterprise IMS network and an operator IMS network, but the registration process of the th mobile terminal is not specifically limited in the embodiment of the present invention, and for example, the mobile terminal may be registered by using the registration method described in any embodiment in fig. 6 to 10.

Optionally, in embodiments, the identity of the second mobile terminal may also be referred to as the user identity of the second mobile terminal.

1120. In case the identity of the second mobile terminal belongs to an internal identity in the enterprise IMS network, the th P-CSCF device routes the call to the second mobile terminal through the S-CSCF device in the enterprise IMS network according to the th INVITE message.

The embodiment of the present invention does not specifically limit the manner in which the second mobile terminal obtains the internal identifier of the enterprise IMS network, for example, in the process of registering the second mobile terminal in the enterprise IMS network, the AS in the enterprise IMS network may allocate the internal identifier of the enterprise to the second mobile terminal, add the internal identifier to the 200OK message, and send the internal identifier to the second mobile terminal through the I/S-CSCF device of the enterprise IMS network.

, the internal identity of the enterprise IMS network is not limited in format, as long as the internal identity can be distinguished from the IMPU provided by the operator IMS network, specifically, compared with the enterprise IMS network, the operator IMS network generally needs to provide services for more mobile terminals, and therefore, the IMPU of the mobile terminal in the operator IMS network is generally longer, and in order to be distinguished from the IMPU provided by the operator IMS network, the internal identity of the enterprise IMS network can be designed to be shorter .

1130. In case the identity of the second mobile terminal does not belong to an internal identity in the enterprise IMS network, the th P-CSCF device routes the call to the second mobile terminal by means of the S-CSCF device of the operator IMS network according to the th INVITE message.

It will be appreciated that if the identity of the second mobile terminal belongs to an internal identity within the enterprise IMS network, indicating that the call between the th mobile terminal and the second mobile terminal belongs to an enterprise internal communication, then the th P-CSCF device will route the call to the second mobile terminal via the S-CSCF device within the enterprise IMS network accordingly, if the identity of the second mobile terminal does not belong to an internal identity within the enterprise IMS network, indicating that the call between the th mobile terminal and the second mobile terminal does not belong to an enterprise internal communication (requiring participation of the operator IMS network), then the th P-CSCF device will route the call to the second mobile terminal via the S-CSCF device within the operator IMS network.

Embodiments of the present invention modify the functionality of a P-CSCF device (e.g., the P-CSCF device described above) for an enterprise IMS network to have a "call proxy function". specifically, if the P-CSCF device in the enterprise IMS network recognizes that the number of the called terminal (i.e., the second mobile terminal) is an internal identifier of the enterprise IMS network, the call is routed to the called terminal by an S-CSCF device in the enterprise IMS network, and the entire call process is performed within the enterprise IMS network without passing through the operator IMS network. in other words, the operator IMS network is unaware of the call process within the enterprise IMS network and does not charge a corresponding fee.a PBX , and if the number of the called terminal does not belong to the internal identifier in the enterprise IMS network, the call is routed to the called terminal by the S-CSCF device in the operator IMS network, thereby enabling communication between the mobile terminal in the enterprise IMS network and the mobile terminal in the operator IMS network, and a PBX 63, which requires the use of the operator IMS network, and the operator can charge the call to the IP network based on the IP process of course, similar to the conventional IP call process of the present invention.

Optionally, in embodiments, the IMS network of the enterprise includes a IMS network and a second IMS network, the S-CSCF device of the enterprise IMS network is located in the 0 th IMS network, the P-CSCF device of the 1 st IMS network and the P-CSCF device of the second IMS network are both connected to the S-CSCF device in the th IMS network, the th P-CSCF device is any P-CSCF device in the th IMS network and the second IMS network, and the th P-CSCF device and the th mobile terminal are located in the same IMS network of the th IMS network and the second IMS network.

Taking fig. 3 as an example, the th IMS network may correspond to the IMS network of the country a campus in fig. 3, the second IMS network may correspond to the IMS network of the country B campus in fig. 3, the S-CSCF device of the enterprise IMS network is located in the IMS network of the country a campus, and the P-CSCF device of the IMS network of the country a campus and the P-CSCF device of the IMS network of the country B campus are both connected to the S-CSCF device of the IMS network of the country a campus.

In contrast to figure 3, during registration, the th mobile terminal initiates registration from a P-CSCF device in the IMS network of the home location of the th mobile terminal to the IMS network of the home location of the th mobile terminal, assuming still that the th mobile terminal is currently located in the a country IMS network, the th mobile terminal initiates a call to the P-CSCF device in the IMS network of the a country, assuming that the th mobile terminal is currently located in the IMS network of the a country or the IMS network of the B country, assuming similarly that the 4645 th mobile terminal is currently located in the IMS network of the B country, the th mobile terminal initiates a call to the P-CSCF device in the IMS network of the a country, assuming that the 85th mobile terminal is currently located in the IMS network of the B country, and the 8524 th mobile terminal is currently located in the IMS network of the B country, assuming that the th mobile terminal is currently located in the IMS network of the B country and the 857 th mobile terminal is currently located in the IMS network of the B country, assuming that the P-CSCF device of the 857 th mobile terminal is located in the IMS network of the P-CSCF.

Optionally, in embodiments, the mobile terminal and the second mobile terminal are located in the same IMS network of the IMS network and the second IMS network, and step 1120 may include the P-CSCF device forwarding the INVITE message to an S-CSCF device in the enterprise IMS network, the P-CSCF device receiving a second INVITE message sent by the S-CSCF device in the enterprise IMS network, the second INVITE message including an IMPU of the second mobile terminal, and the P-CSCF device routing the call to the second mobile terminal according to the IMPU of the second mobile terminal.

Since the th mobile terminal and the second mobile terminal are located in the same IMS network, the th P-CSCF device is responsible for forwarding the call originated from the th mobile terminal to the S-CSCF device in the enterprise IMS network, and for routing the call originated from the th mobile terminal to the second mobile terminal.

It should be noted that the second INVITE message includes the IMPU of the second mobile terminal, that is, in the embodiment of the present invention, the enterprise IMS network converts the identity of the second mobile terminal included in the th INVITE message, and converts the identity from the internal identity of the enterprise IMS network to the IMPU, so that the second INVITE message can be routed to the second mobile terminal in the existing manner.

Taking fig. 3 as an example, assuming that the th mobile terminal and the second mobile terminal are both located in the a-country IMS network, the P-CSCF device in the a-country IMS network will first receive the INVITE message sent by the th mobile terminal, and after forwarding the INVITE message to the I/S-CSCF device of the a-country IMS network, the P-CSCF device in the a-country IMS network will receive the INVITE message returned by the I/S-CSCF device of the a-country IMS network, at this time, the P-CSCF device in the a-country IMS network will need to route the INVITE message to the second mobile terminal, assuming that the th mobile terminal and the second mobile terminal are both located in the B-country IMS network, the P-CSCF device in the B-country IMS network will first receive the INVITE message sent by the th mobile terminal, after forwarding the INVITE message to the I/S-CSCF device of the a-country IMS network, the P-CSCF device in the B-country IMS network will receive the INVITE message sent by the th mobile terminal, and then the INVITE message is returned to the second mobile terminal by the I/S-CSCF device of the a-country IMS network.

Optionally, in embodiments, the mobile terminal is located in the second IMS network, the P-CSCF device is a P-CSCF device of the second IMS network, the method in fig. 11 may further include the P-CSCF device receiving a third INVITE message sent by the S-CSCF device in the IMS network, where the third INVITE message is an INVITE message corresponding to a call initiated by a third mobile terminal in the IMS network, and the third INVITE message includes an IMPU of an mobile terminal, and the P-CSCF device routes the call initiated by the third mobile terminal to the mobile terminal according to the IMPU of the mobile terminal.

Taking fig. 3 as an example, the th IMS network may correspond to the a country garden IMS network in fig. 3, and the second IMS network may correspond to the B country garden IMS network in fig. 3. in this embodiment, the th P-CSCF device is a P-CSCF device in the B country garden IMS network, the third mobile terminal is located in the a country garden IMS network, and the th mobile terminal is located in the B country garden IMS network, i.e., the mobile terminal in the a country garden IMS network calls the mobile terminal in the B country garden IMS network, and the entire calling process is completed under cooperation of the a country garden IMS network and the network element in the B country garden IMS network, and there is no participation of the network element in the operator IMS network, so that the operator does not perceive the communication process between the plurality of IMS networks of the enterprise, and no corresponding fee is charged.

Fig. 12 to 17 illustrate the mobile terminal as a UE (for example, a VoLTE terminal), and the P-CSCF device as an SBC/P-CSCF combined device (abbreviated as SBC/P-CSCF device), and in the embodiments of fig. 12 to 17, for convenience of description, the internal identifier provided by the enterprise IMS network is referred to as a short number, and the IMPU of the UE is referred to as a long number, it should be noted that the examples of fig. 12 to 17 are only for assisting those skilled in the art to understand the embodiments of the present invention, and are not intended to limit the embodiments of the present invention to the specific values or specific scenarios illustrated.

Fig. 12 is a schematic diagram of a call flow provided by embodiments of the present invention, in the embodiment of fig. 12, both the calling UE and the called UE belong to the a-country campus IMS network, that is, the a-country campus IMS network is a home location of the calling UE and the called UE, and both the calling UE and the called UE are currently located in the a-country campus IMS network.

The method of FIG. 12 includes:

1202. the calling UE dials the short number of the called UE in the IMS network of the A country park, and sends an INVITE message to SBC/P-CSCF equipment in the IMS network of the A country park.

Specifically, the short number of the called UE may be located in the Request-URI field of the INVITE message. The P-Asserted-indication field and the From field of the INVITE message may carry the TEL-formatted IMPU and the SIP-formatted IMPU of the calling UE, respectively.

1204. And the SBC/P-CSCF equipment of the IMS network of the country A park triggers a call proxy function, judges that the called UE is the UE in the enterprise according to the short number of the called UE carried in the INVITE message, and forwards the INVITE message to the S-CSCF equipment of the IMS network of the country A park.

Before forwarding the INVITE message to the S-CSCF device of the IMS network of the country a, the SBC/P-CSCF device of the IMS network of the country a may determine whether the calling UE is a registered user of the IMS network of the country a according to the registration information of the calling UE and the P-Asserted-index field and the From field of the received INVITE message, and forward the INVITE message to the S-CSCF device of the IMS network of the country a in the case that the calling UE is a registered user of the IMS network of the country a; otherwise, the INVITE message may be rejected.

1206. And the S-CSCF equipment in the IMS network of the country A park sends the updated INVITE message to the SBC/P-CSCF equipment in the IMS network of the country A park.

Specifically, the IMS network in the campus a (which may be, specifically, an AS of the IMS network in the campus a) updates the INVITE message, and converts the short number of the called UE in the INVITE message into the long number of the UE (i.e., the IMPU of the UE). And then the updated INVITE message is sent to SBC/P-CSCF equipment in the IMS network of the campus A through the S-CSCF equipment.

1208 and 1232, the SBC/P-CSCF device in the IMS network of the campus a routes the call to the called UE according to the long number of the UE, the called UE rings and sends 180RINGING (i.e. RINGING message), the called UE goes off-hook and sends 200OK message, and the call between the calling UE and the called UE is successfully established.

Steps 1208 to 1232 are similar to the prior art, and refer to the existing IMS call flow specifically, and are not described in detail here.

FIG. 13 is a schematic diagram of a call flow provided by another embodiment of the present invention, in the embodiment of FIG. 13, the calling UE belongs to a Garden A IMS network, and the called UE UE., where the calling UE calls a garden B IMS network in the garden A IMS network, is substantially similar to the flow of FIG. 12, with the main difference that, since the called UE is located in the garden B IMS network, after receiving an INVITE message from the garden A IMS network, an S-CSCF device of the garden A IMS network needs to forward a subsequent INVITE message to an SBC/P-CSCF device in the garden B IMS network, so that the call is routed to the called UE through the SBC/P-CSCF device in the garden B IMS network.

FIG. 14 is a schematic diagram of a call flow provided by yet another embodiment of the present invention, in the embodiment of FIG. 14, a calling UE belongs to a national park IMS network, and the calling UE calls a called party UE. in the A operator IMS network in the A park IMS network, the flow of FIG. 14 is substantially similar to the flow of FIG. 12, the main difference is that a Request-URI in an INVITE message sent by the calling UE is an IMPU of the called UE, an SBC/P-CSCF device in the A park IMS network is an IMPU according to the Request-URI, forwards the INVITE message to an S-CSCF device in the A operator IMS network, and an SBC/P-CSCF device in the A operator IMS network routes the call to the called UE.

FIG. 15 is a schematic diagram of a call flow provided by yet another embodiment of the present invention, in the embodiment of FIG. 15, the calling UE belongs to a national operator IMS network, and the calling UE calls the called party UE. in the national campus IMS network in the national operator IMS network, the flow of FIG. 15 is substantially similar to the flow of FIG. 12, with the main difference that the calling UE sends an INVITE message to an S-CSCF device in the national operator IMS network via an SBC/P-CSCF device of the national operator IMS network, and the S-CSCF device in the national operator IMS network forwards the INVITE message to an SBC/P-CSCF device of the national campus IMS network, thereby routing the call to the called UE via the SBC/P-CSCF device of the national campus IMS network.

Fig. 16 is a schematic diagram of a call flow provided by a further embodiment, in the embodiment of fig. 16, the calling UE belongs to a country operator IMS network, and the call flow of the calling UE calling the called UE UE. in the country operator IMS network under the country operator IMS network is substantially the same as the call flow between two UEs in the existing operator, and will not be described in detail herein.

Fig. 17 is a schematic diagram of a call flow provided by yet another embodiment of the present invention, in the embodiment of fig. 17, a calling UE belongs to a campus a IMS network, and the call flow of the calling UE calling a called party UE. in the campus a IMS network under the campus B IMS network is substantially similar to the call flow of fig. 13, except that after receiving an INVITE message, an SBC/P-CSCF device in the campus B IMS network needs to forward the INVITE message to an S-CSCF device of the campus a IMS network for processing, and finally, the SBC/P-CSCF device in the campus a IMS network routes the call to the called UE.

In the following, embodiments of the apparatus of the present invention are described, and since embodiments of the apparatus can perform the above-described method, reference can be made to the foregoing embodiments of the method for parts not described in detail.

Fig. 18 is a schematic block diagram of a P-CSCF device provided by embodiments of the present invention, the P-CSCF device 1800 of fig. 18 is a P-CSCF device in an enterprise IMS network, the P-CSCF device includes a -th receiving module 1810, an -th routing module 1820, and a second routing module 1830, a -th P-CSCF device may be used to perform the method described in fig. 11, e.g., the -th receiving module 1810 may be used to perform step 1110 in fig. 11, the -th routing module 1820 may be used to perform step 1120 in fig. 11, and the second routing module 1830 may be used to perform step 1130 in fig. 11.

The th receiving module 1810 is configured to receive a th INVITE message sent by a th mobile terminal, where the th mobile terminal is a registered terminal of the enterprise IMS network and the operator IMS network, and the th INVITE message includes an identifier of a called second mobile terminal.

The th routing module 1820 is configured to route the call to the second mobile terminal through an S-CSCF device in the enterprise IMS network according to the th INVITE message if the identity of the second mobile terminal belongs to an internal identity in the enterprise IMS network.

The second routing module 1830 is configured to route, according to the INVITE message, the call to the second mobile terminal through an S-CSCF device of the operator IMS network if the identifier of the second mobile terminal does not belong to the internal identifier in the enterprise IMS network.

Embodiments of the present invention modify the functionality of a P-CSCF device (e.g., the P-CSCF device described above) for an enterprise IMS network to have a "call proxy function". specifically, if the P-CSCF device in the enterprise IMS network recognizes that the number of the called terminal (i.e., the second mobile terminal) is an internal identifier of the enterprise IMS network, the call is routed to the called terminal by an S-CSCF device in the enterprise IMS network, and the entire call process is performed within the enterprise IMS network without passing through the operator IMS network. in other words, the operator IMS network is unaware of the call process within the enterprise IMS network and does not charge a corresponding fee.

Optionally, in embodiments, the P-CSCF device further includes a second receiving module, configured to receive a REGISTER message sent by the th mobile terminal, and a registration module, configured to REGISTER the th mobile terminal with the operator IMS network and the enterprise IMS network according to the REGISTER message.

Optionally, in embodiments, the REGISTER message is configured to REGISTER in the operator IMS network, and the registration module is specifically configured to forward the REGISTER message to an S-CSCF device of the operator IMS network, receive a response message sent by the operator IMS network, where the response message is used to indicate that the mobile terminal is successfully registered in the operator IMS network, forward the response message to the mobile terminal, where the mobile terminal sends a second REGISTER message to the S-CSCF device of the enterprise IMS network after the operator IMS network is successfully registered, and receive a second response message sent by the S-CSCF device of the enterprise IMS network, where the second response message is used to indicate that the mobile terminal is successfully registered in the enterprise IMS network.

Optionally, in embodiments, the IMPU carried in the second REGISTER message is the same as the IMPU carried in the response message.

Optionally, in embodiments, the IMPU carried in the response message includes an IMPU in a session initiation protocol, SIP, format, and the IMPI carried in the second REGISTER message includes a remaining character in the IMPU in the SIP format except for a target character, where the target character is SIP: +.

Optionally, in embodiments, the IMS networks of the enterprise include a IMS network and a second IMS network, where S-CSCF devices of the enterprise IMS network are located in the 0 th IMS network, a P-CSCF device of the 1 st IMS network and a P-CSCF device of the second IMS network are both connected to an S-CSCF device of the th IMS network, the th P-CSCF device is any P-CSCF device of the th IMS network and the second IMS network, and the th P-CSCF device and the th mobile terminal are located in the same IMS network of the th IMS network and the second IMS network.

Optionally, in embodiments, the mobile terminal and the second mobile terminal are located in the same of the IMS network and the second IMS network, and the routing module 1820 is specifically configured to forward the th INVITE message to an S-CSCF device in the enterprise IMS network, receive a second INVITE message sent by the S-CSCF device in the enterprise IMS network, where the second INVITE message includes an IMPU of the second mobile terminal, and route the call to the second mobile terminal according to the IMPU of the second mobile terminal.

Optionally, in embodiments, the mobile terminal is located in the second IMS network, the P-CSCF device is a P-CSCF device of the second IMS network, and the P-CSCF device further includes a third receiving module, configured to receive a third INVITE message sent by an S-CSCF device in the IMS network, where the third INVITE message is an INVITE message corresponding to a call initiated by a third mobile terminal in the IMS network, and the third INVITE message includes an IMPU of the mobile terminal, and a third routing module, configured to route the call initiated by the third mobile terminal to the mobile terminal according to the IMPU of the mobile terminal.

Fig. 19 is a schematic block diagram of a P-CSCF device provided in another embodiment of the present invention, the P-CSCF device 1900 of fig. 19 is a P-CSCF device for an enterprise IMS network, the P-CSCF device includes a th receiving module 1910 and a registration module 1920, the th P-CSCF device is operable to perform the method of fig. 6, for example, the th receiving module 1910 is operable to perform step 610 of fig. 6, the registration module 1920 is operable to perform step 620 of fig. 6, and the functions of the th receiving module 1910 and the registration module 1920 are described in detail below.

The th receiving module 1910 is configured to receive a th REGISTER message sent by a th mobile terminal, where the th P-CSCF device is a th P-CSCF device of an enterprise IMS network.

The registration module 1920 is configured to REGISTER the th mobile terminal with an operator IMS network and the enterprise IMS network according to the th REGISTER message.

Optionally, in embodiments, the REGISTER message is used to REGISTER in an operator IMS network, and the registration module 1920 is specifically configured to forward the REGISTER message to an S-CSCF device of the operator IMS network, receive a response message sent by the operator IMS network, where the response message is used to indicate that the registration of the mobile terminal in the operator IMS network is successful, forward the response message to the mobile terminal, where the mobile terminal sends a second REGISTER message to the S-CSCF device of the enterprise IMS network after the registration of the operator IMS network is successful, and receive a second response message sent by the S-CSCF device of the enterprise IMS network, where the second response message is used to indicate that the registration of the mobile terminal in the enterprise IMS network is successful.

Optionally, in embodiments, the IMS networks of the enterprise include a IMS network and a second IMS network, where S-CSCF devices of the enterprise IMS network are located in the 0 th IMS network, a P-CSCF device of the 1 st IMS network and a P-CSCF device of the second IMS network are both connected to an S-CSCF device of the th IMS network, the th P-CSCF device is any P-CSCF device of the th IMS network and the second IMS network, and the th P-CSCF device and the th mobile terminal belong to the same IMS network of the st IMS network and the second IMS network.

Fig. 20 is a schematic block diagram of a P-CSCF device according to yet another embodiment of the present invention, the P-CSCF device 2000 of fig. 20 is a P-CSCF device in an enterprise IMS network, the P-CSCF device includes a memory 2010 and a processor 2020, the memory 2010 is used for storing instructions, and the processor 2020 is used for executing the instructions stored in the memory 2010 to perform the steps or operations of the method corresponding to fig. 11.

In particular, the processor 2020 is configured to perform the following operations:

receiving a INVITE message sent by an th mobile terminal, wherein the th mobile terminal is a registered terminal of the enterprise IMS network and the operator IMS network, and the INVITE message contains an identifier of a called second mobile terminal;

routing a call to the second mobile terminal through an S-CSCF device in the enterprise IMS network according to the INVITE message when the identifier of the second mobile terminal belongs to an internal identifier in the enterprise IMS network;

and under the condition that the identifier of the second mobile terminal does not belong to the internal identifier in the enterprise IMS network, routing the call to the second mobile terminal through S-CSCF equipment of the operator IMS network according to the INVITE message.

Optionally, in embodiments, the processor 2020 is further configured to receive a REGISTER message sent by the th mobile terminal, and REGISTER the th mobile terminal with the operator IMS network and the enterprise IMS network according to the REGISTER message.

Optionally, in embodiments, the REGISTER message is used to REGISTER in the operator IMS network, and the registering of the 1 mobile terminal to the operator IMS network and the enterprise IMS network according to the 0REGISTER message includes forwarding the REGISTER message to an S-CSCF device of the operator IMS network, receiving a response message sent by the operator IMS network, where the response message is used to indicate that the mobile terminal is successfully registered in the operator IMS network, forwarding the response message to the mobile terminal, sending a second REGISTER message to an S-CSCF device of the enterprise IMS network after the mobile terminal is successfully registered in the operator IMS network, and receiving a second response message sent by the S-CSCF enterprise IMS device of the enterprise IMS network, where the second response message is used to indicate that the mobile terminal is successfully registered in the enterprise IMS network.

Optionally, in embodiments, the IMPU carried in the response message includes an IMPU in SIP format, and the IMPI carried in the second REGISTER message includes the remaining characters except the target character in the IMPU in SIP format, where the target character is SIP: +.

Optionally, in embodiments, the mobile terminal and the second mobile terminal are located in the same of the IMS network and the second IMS network, and the routing the call to the second mobile terminal through the S-CSCF device in the enterprise IMS network according to the INVITE message includes forwarding the INVITE message to the S-CSCF device in the enterprise IMS network, receiving a second INVITE message sent by the S-CSCF device in the enterprise IMS network, where the second INVITE message includes an IMPU of the second mobile terminal, and routing the call to the second mobile terminal according to the IMPU of the second mobile terminal.

Optionally, in embodiments, the mobile terminal is located in the second IMS network, the P-CSCF device is a P-CSCF device of the second IMS network, and the processor 2020 is further configured to receive a third INVITE message sent by an S-CSCF device of the IMS network, where the third INVITE message is an INVITE message corresponding to a call initiated by a third mobile terminal of the IMS network, and the third INVITE message includes an IMPU of the mobile terminal, and route the call initiated by the third mobile terminal to the mobile terminal according to the IMPU of the mobile terminal.

Fig. 21 is a schematic block diagram of a P-CSCF device according to yet another embodiment of the present invention, the P-CSCF device 2100 of fig. 21 is a P-CSCF device of an enterprise IMS network, the P-CSCF device includes a memory 2110 and a processor 2120, the memory 2110 is used for storing instructions, and the processor 2120 is used for executing the instructions stored in the memory 2110 to perform the steps or operations of the method corresponding to fig. 6.

Specifically, processor 2120 is configured to perform the following operations:

receiving a REGISTER message sent by an th mobile terminal, wherein the th P-CSCF device is a th P-CSCF device of an enterprise IMS network;

registering the th mobile terminal with an operator IMS network and the enterprise IMS network according to the th REGISTER message.

Optionally, in embodiments, the REGISTER message is used for registering in an operator IMS network, and the registering of the 1 mobile terminal to the operator IMS network and the enterprise IMS network according to the 0REGISTER message includes forwarding the REGISTER message to an S-CSCF device of the operator IMS network, receiving a response message sent by the operator IMS network, the response message being used to indicate that the mobile terminal is successfully registered in the operator IMS network, forwarding the response message to the mobile terminal, sending a second REGISTER message to an S-CSCF device of the enterprise IMS network after the successful registration of the operator IMS network by the mobile terminal, and receiving a second response message sent by the S-CSCF device of the enterprise IMS network, the second response message being used to indicate that the mobile terminal is successfully registered in the enterprise IMS network.

The computer instructions may be stored in a computer readable storage medium, or transmitted from a computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from websites, computers, servers, or data centers via a wired (e.g., coaxial cable, fiber optic cable, Digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, compact disc, etc.) website, to a computer, to a server, or to a data center via a solid state storage medium, such as a solid state storage medium, a Digital Video Disk (DVD), or a solid state storage medium, such as a DVD, a Digital Video Disk (DVD), or a digital video disk (SSD)), to another website, a computer, or a data center via a wired (e.g., optical cable, Digital Subscriber Line (DSL)), or a solid state storage medium, such as a magnetic disk (DVD), a solid state storage medium, a computer readable storage medium, a Digital Video Disk (DVD), or a digital video disk (optical disk (DVD), or a storage medium).

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units into logical functional divisions may be realized in other ways, for example, multiple units or components may be combined or integrated into another systems, or features may be omitted or not executed, in another point, the shown or discussed coupling or direct coupling or communication connection between each other may be through interfaces, indirect coupling or communication connection between units or devices may be electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in places, or may also be distributed on multiple network units.

In addition, functional units in the embodiments of the present application may be integrated into processing units, or each unit may exist alone physically, or two or more units are integrated into units.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1, A method of wireless communication, comprising:

a th proxy call session control function P-CSCF device in an enterprise Internet protocol multimedia subsystem (IMS) network receives a th INVITE message sent by a th mobile terminal, wherein the th mobile terminal is a registered terminal of the enterprise IMS network and an operator IMS network, and the th INVITE message contains an identifier of a called second mobile terminal;

in case the identity of the second mobile terminal belongs to an internal identity in the enterprise IMS network, the th P-CSCF device routes the call to the second mobile terminal through a serving call session control function, S-CSCF, device in the enterprise IMS network according to the th INVITE message;

and under the condition that the identifier of the second mobile terminal does not belong to the internal identifier in the enterprise IMS network, the th P-CSCF device routes the call to the second mobile terminal through the S-CSCF device of the operator IMS network according to the th INVITE message.

2. The method of claim 1, wherein before the th P-CSCF device receives the th INVITE message sent by the th mobile terminal, the method further comprises:

the th P-CSCF device receives a th REGISTER message sent by the th mobile terminal;

the th P-CSCF device registering the th mobile terminal to the operator IMS network and the enterprise IMS network according to the th REGISTER message.

3. The method of claim 2, wherein the REGISTER message is used for registration with the operator IMS network,

the th P-CSCF device registering the th mobile terminal to the operator IMS network and the enterprise IMS network according to the th REGISTER message, including:

the th P-CSCF device forwarding the th REGISTER message to an S-CSCF device of the operator IMS network;

the th P-CSCF device receives a th response message sent by the operator IMS network, wherein the th response message is used for indicating that the th mobile terminal is successfully registered in the operator IMS network;

the P-CSCF device forwards the response message to the mobile terminal;

after the th mobile terminal successfully REGISTERs in the operator IMS network, the th P-CSCF device sends a second REGISTER message to an S-CSCF device of the enterprise IMS network;

and the P-CSCF device receives a second response message sent by an S-CSCF device of the enterprise IMS network, wherein the second response message is used for indicating that the mobile terminal is successfully registered in the enterprise IMS network.

4. A method as claimed in claim 3 wherein the internet protocol multimedia subsystem public identity IMPU carried in the second REGISTER message is the same as the IMPU carried in the th response message.

5. A method according to claim 3 or 4, wherein the IMPU carried in the th response message comprises an IMPU in the Session initiation protocol, SIP, format, and the IMPI carried in the second REGISTER message comprises the remaining characters in the IMPU in the SIP format except for the target character, which is SIP: +.

6. The method of claim 1, wherein the enterprise' S IMS networks include an th IMS network and a second IMS network, wherein S-CSCF devices of the enterprise IMS network are located in the th IMS network, wherein the P-CSCF devices of the 0 th IMS network and the P-CSCF devices of the second IMS network are both connected to S-CSCF devices in the th IMS network, wherein the th P-CSCF device is any P-CSCF device in the th IMS network and the second IMS network, and wherein the th P-CSCF device and the th mobile terminal are located in the same th IMS network of the th IMS network and the second IMS network.

7. The method of claim 6, wherein the th mobile terminal is located in the same of the th IMS network and the second IMS network as the second mobile terminal,

the th P-CSCF device routing the call to the second mobile terminal through an S-CSCF device in the enterprise IMS network according to the th INVITE message, including:

the th P-CSCF device forwards the th INVITE message to an S-CSCF device in the enterprise IMS network;

the th P-CSCF device receives a second INVITE message sent by an S-CSCF device of the enterprise IMS network, wherein the second INVITE message comprises an IMPU of the second mobile terminal;

the P-CSCF device routes the call to the second mobile terminal according to the IMPU of the second mobile terminal.

8. The method of claim 6, wherein the th mobile terminal is located in the second IMS network, the th P-CSCF device being a P-CSCF device of the second IMS network, the method further comprising:

the P-CSCF device receives a third INVITE message sent by an S-CSCF device in the IMS network, where the third INVITE message is an INVITE message corresponding to a call initiated by a third mobile terminal in the IMS network, and the third INVITE message includes an IMPU of the mobile terminal;

and the P-CSCF device routes the call originated by the third mobile terminal to the th mobile terminal according to the IMPU of the th mobile terminal.

9, A method of wireless communication, comprising:

a proxy call session control function (P-CSCF) device receives a REGISTER message sent by a mobile terminal, wherein the P-CSCF device is a P-CSCF device of an enterprise Internet protocol multimedia subsystem (IMS) network;

the th P-CSCF device registering the th mobile terminal to an operator IMS network and the enterprise IMS network according to the th REGISTER message;

the th P-CSCF device forwarding the th REGISTER message to an S-CSCF device of an operator IMS network;

the P-CSCF device forwards the response message to the mobile terminal;

the P-CSCF device receives a second response message sent by an S-CSCF device of the enterprise IMS network, wherein the second response message is used for indicating that the mobile terminal is successfully registered in the enterprise IMS network;

the internet protocol multimedia subsystem public identity IMPU carried in the second REGISTER message is the same as the IMPU carried in the th response message.

10. The method of claim 9 wherein the IMPU carried in the th response message comprises an IMPU in the Session Initiation Protocol (SIP) format, and wherein the IMPI carried in the second REGISTER message comprises the remaining characters of the IMPU in the SIP format except for the target character, which is SIP: +.

11. The method according to claim 9 or 10, wherein the IMS networks of the enterprise include th and second IMS networks, the S-CSCF device of the enterprise IMS network is located in the th IMS network, the P-CSCF device of the 0 th IMS network and the P-CSCF device of the second IMS network are both connected to the S-CSCF device in the th IMS network, the th P-CSCF device is any P-CSCF device in the th and second IMS networks, and the th P-CSCF device and the th mobile terminal belong to the same th of the th and second IMS networks.

A proxy Call Session control function, P-CSCF, device of the kind 12, , characterized in that the P-CSCF device is a P-CSCF device in an enterprise Internet protocol multimedia subsystem, IMS, network,

the th P-CSCF device comprising:

an th receiving module, configured to receive a th INVITE message sent by a th mobile terminal, where the th mobile terminal is a registered terminal of the enterprise IMS network and the operator IMS network, and the th INVITE message includes an identifier of a called second mobile terminal;

an routing module, configured to, if the identifier of the second mobile terminal belongs to the internal identifier in the enterprise IMS network, route the call to the second mobile terminal through a serving call session control function S-CSCF device in the enterprise IMS network according to the INVITE message;

and a second routing module, configured to route, according to the th INVITE message, the call to the second mobile terminal through an S-CSCF device of the operator IMS network, when the identifier of the second mobile terminal does not belong to the internal identifier in the enterprise IMS network.

13. The P-CSCF device of claim 12 wherein the P-CSCF device further comprises:

a second receiving module, configured to receive a REGISTER message sent by the th mobile terminal;

a registration module for registering the th mobile terminal to the operator IMS network and the enterprise IMS network according to the th REGISTER message.

14. The P-CSCF device of claim 13, wherein the REGISTER message is to be used for registering with the operator IMS network,

the registration module is specifically configured to forward the th REGISTER message to an S-CSCF device of the operator IMS network, receive a th response message sent by the operator IMS network, where the th response message is used to indicate that the th mobile terminal successfully REGISTERs in the operator IMS network, forward the th response message to the th mobile terminal, where the th mobile terminal sends a second REGISTER message to an S-CSCF device of the enterprise IMS network after the operator IMS network successfully REGISTERs, and receive a second response message sent by an S-CSCF device of the enterprise IMS network, where the second response message is used to indicate that the th mobile terminal successfully REGISTERs in the enterprise IMS network.

15. The P-CSCF device of claim 14 wherein the internet protocol multimedia subsystem public identity IMPU carried in the second REGISTER message is the same as the IMPU carried in the th response message.

16. The P-CSCF device of claim 14 or 15 wherein the IMPU carried in the th response message comprises an IMPU in the session initiation protocol, SIP, format and the IMPI carried in the second REGISTER message comprises the remaining characters in the IMPU in the SIP format except for a target character which is SIP: +.

17. The P-CSCF device of claim 12 wherein the IMS networks of the enterprise include an th IMS network and a second IMS network, the S-CSCF device of the enterprise IMS network is located in the th IMS network, the P-CSCF device of the 0 th IMS network and the P-CSCF device of the second IMS network are both connected to the S-CSCF device of the th IMS network, the th P-CSCF device is any P-CSCF device of the th IMS network and the second IMS network, and the th P-CSCF device and the th mobile terminal are located in the same th IMS network of the th IMS network and the second IMS network.

18. The P-CSCF apparatus of claim 17, wherein the mobile terminal is located in a same of the IMS network and the second IMS network as the second mobile terminal,

the routing module is specifically configured to forward the INVITE message to an S-CSCF device in the enterprise IMS network, receive a second INVITE message sent by the S-CSCF device in the enterprise IMS network, where the second INVITE message includes an IMPU of the second mobile terminal, and route a call to the second mobile terminal according to the IMPU of the second mobile terminal.

19. The P-CSCF device of claim 17 wherein the mobile terminal is located in the second IMS network, the P-CSCF device is a P-CSCF device of the second IMS network, the P-CSCF device further comprising:

a third receiving module, configured to receive a third INVITE message sent by an S-CSCF device in the th IMS network, where the third INVITE message is an INVITE message corresponding to a call initiated by a third mobile terminal in the th IMS network, and the third INVITE message includes an IMPU of the th mobile terminal;

a third routing module, configured to route the call originated by the third mobile terminal to the th mobile terminal according to the IMPU of the th mobile terminal.

A proxy Call Session control function, P-CSCF, apparatus of 20, , wherein the P-CSCF apparatus is a P-CSCF apparatus of an enterprise Internet protocol multimedia subsystem, IMS, network,

the th P-CSCF device comprising:

a th receiving module, configured to receive a th REGISTER message sent by a th mobile terminal, where the th P-CSCF device is a th P-CSCF device of an enterprise internet protocol multimedia subsystem, IMS, network;

a registration module for registering the th mobile terminal to an operator IMS network and the enterprise IMS network according to the th REGISTER message;

the registration module is specifically used for forwarding the th REGISTER message to S-CSCF equipment of an operator IMS network, receiving a th response message sent by the operator IMS network, wherein the th response message is used for indicating that the mobile terminal is successfully registered in the operator IMS network, forwarding the th response message to the th mobile terminal, sending a second REGISTER message to S-CSCF equipment of the enterprise IMS network after the mobile terminal is successfully registered in the operator IMS network, receiving a second response message sent by the S-CSCF equipment of the enterprise IMS network, and wherein the second response message is used for indicating that the mobile terminal is successfully registered in the enterprise IMS network;

21. The P-CSCF device of claim 20 wherein the IMPU carried in the th response message comprises an IMPU in the session initiation protocol, SIP, format and the IMPI carried in the second REGISTER message comprises the remaining characters in the IMPU in the SIP format except for the target character which is SIP: +.

22. The P-CSCF device of claim 20 or 21 wherein the IMS networks of the enterprise include an th IMS network and a second IMS network, the S-CSCF device of the enterprise IMS network is located in the th IMS network, the P-CSCF device of the 0 th IMS network and the P-CSCF device of the second IMS network are both connected to the S-CSCF device of the th IMS network, the th P-CSCF device is any P-CSCF device of the th IMS network and the second IMS network, and the th P-CSCF device and the th mobile terminal belong to the same th IMS network of the th IMS network and the second IMS network.