CN110324874B

CN110324874B - Method, device and storage medium for processing media session

Info

Publication number: CN110324874B
Application number: CN201810271749.8A
Authority: CN
Inventors: 吴凤伟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2020-10-23
Anticipated expiration: 2038-03-29
Also published as: CN110324874A

Abstract

A method, device and storage medium for media session processing are provided, the method comprises: if the service application server receives a first switching request message from a calling session management function network element before receiving a first 200OK response from a called terminal, determining that media negotiation between the calling terminal and the called terminal is not completed, wherein the first 200OK response refers to a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, and the first switching request message is used for indicating the calling terminal to perform network switching; generating a temporary response according to a first SDP information body in the first switching request message, and sending the temporary response to the calling session control function network element, wherein the temporary response is used for network switching of the calling terminal; and receiving a first temporary response confirmation message for indicating the calling terminal to complete network switching from the calling session control function network element. By adopting the scheme, the network switching of the calling terminal before the media negotiation between the calling terminal and the called terminal is not completed can be realized.

Description

Method, device and storage medium for processing media session

Technical Field

The present application relates to the field of IMS technologies, and in particular, to a method, an apparatus, and a storage medium for processing a media session.

Background

During a media session, if a user moves out of a Long Term Evolution (LTE) network, the user may switch to a 2G/3G network through Single Radio Voice Call Continuity (SRVCC) so as to ensure continuity of the media session between terminals. In an internet protocol multimedia system (IMS) session establishment process, a terminal (including a calling terminal and a called terminal) performs Session Initiation Protocol (SIP) signaling interaction with the IMS, performs media negotiation through Session Description Protocol (SDP) information, after the media negotiation is completed, the IMS indicates to establish a dedicated bearer exclusively carrying QCI1, and after the dedicated bearer of QCI1 is established, a Radio Access Network (RAN) side (including a base station and the terminal) has a vcc srhandover condition.

However, in the handover standard of the RAN side, as long as the dedicated bearer is established, the base station of the RAN side detects the media quality by triggering, and when the media quality is poor, it is considered that the network handover can be performed on the calling terminal, and the RAN side only pays attention to the media quality and does not pay attention to the media negotiation signaling. In the IMS handover standard, it is defined that the network handover must be performed after the negotiation between the calling terminal and the called terminal is completed. So there is a contradiction between the two: when the dedicated bearer is established but the media negotiation is not completed, handover may occur at the calling terminal. However, in the switching standard of the IMS core network, an Access Transfer Control Function (ATCF) in the IMS core network determines whether the switching can be performed for the calling terminal according to the switching capability of the core network side, and the ATCF rejects the switching of the calling terminal because the media negotiation is not completed.

As can be seen, the prior art provides the SRVCC handover procedure in the scenario where the media negotiation is completed, but does not define the SRVCC handover procedure in the scenario where the media negotiation is not completed. Because the media negotiation between the calling terminal and the called terminal is not completed, the network switching of the calling terminal fails, and the call drop between the calling terminal and the called terminal is further caused.

Disclosure of Invention

The application provides a method, a device and a storage medium for processing a media session, which can solve the problem that in the prior art, when media negotiation between terminals is not completed, the terminals fail to switch networks through SRVCC.

A first aspect of the present application provides a method for media session processing, where the method includes:

if a service application server receives a first switching request message from a calling session management function network element before receiving a first 200OK response from a called terminal, the service application server determines that media negotiation between the calling terminal and the called terminal is not completed, the first 200OK response refers to a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, the first switching request message is used for indicating the calling terminal to perform network switching, and the first switching request message carries a first Session Description Protocol (SDP) information body.

The service application server acquires the first SDP information body from the first switching request message, generates a temporary response according to the first SDP information body, and sends the temporary response to the calling session control function network element, wherein the temporary response is used for network switching of the calling terminal;

and the service application server receives a first temporary response confirmation message from the calling session control function network element, wherein the first temporary response confirmation message is used for indicating the calling terminal to complete network switching.

Compared with the existing mechanism, in the method, after receiving a first switching request message from a calling terminal, a service application server responds to a calling session management function network element by constructing a temporary response mode according to a first SDP information body, so that even if the calling session management function network element does not acquire the switching capability of an IMS core network side, the network switching of the calling terminal before the calling terminal and a called terminal do not finish media negotiation can be realized; even if the calling terminal and the called terminal do not finish the media negotiation, the network element of the calling session management function can also switch the network of the calling terminal.

In one possible design, the first SDP body includes media description information of the calling terminal; the generating a temporary response according to the first SDP body of information includes:

and generating the temporary response according to the encoding and decoding of the media description information of the calling terminal.

In one possible design, after the service application server receives the first temporary response confirmation message from the calling session control function network element, the method further includes:

after establishing media session connection between a calling terminal and a called terminal, the service application server triggers a media renegotiation process between the calling terminal and the called terminal, so that media negotiation between the calling terminal and the called terminal is completed.

the service application server sends a notification message to the calling session control function network element, wherein the notification message is used for indicating the session state of the calling terminal; when the network of the calling terminal is switched to the single standby voice continuous bSRVCC before ringing, the session state is the advanced ringing; and when the network of the calling terminal is switched to the single-standby voice continuous aRVCC after ringing and before answering, the session state is early receiving.

And the service application server receives a notification response from the calling session control function network element.

In one possible design, the triggering a media renegotiation procedure between the calling terminal and the called terminal includes:

the service application server sends a first message to the calling session control function network element, wherein the first message is used for acquiring the media description information of the calling terminal and for renegotiation between the calling terminal and the called terminal, and the first message does not carry an SDP information body;

the service application server receives a second 200OK response from the calling session control function network element, wherein the second 200OK response carries the media description information of the calling terminal;

when determining that the media information of the media stream received and transmitted by the calling terminal is inconsistent with the media information of the media stream received and transmitted by the called terminal, the service application server sends a second switching request message to the called terminal, wherein the second switching request message carries the media description information of the calling terminal;

the service application server receives first SDP response information from the called terminal to the second switching request message, wherein the first SDP response information comprises target media information used when the called terminal and the calling terminal carry out voice communication;

and the service application server sends the first SDP response information to the calling session control function network element.

In a possible design, after the service application server receives the first temporary response confirmation message from the calling session control function network element and before the triggering of the media renegotiation procedure between the calling terminal and the called terminal, the method further includes:

the service application server receives a first Session Initiation Protocol (SIP) message from the called terminal, deletes a second SDP information body in the first SIP message, and sends the first SIP message after deleting the second SDP information body to the calling session control function network element, wherein the first SIP message is used for requesting to establish media session connection between the calling terminal and the called terminal.

In a possible design, after the service application server receives a first 200OK response from the called terminal, and before the service application server sends a first SIP message to the calling session control function network element after deleting the second SDP body, the method further includes:

when the session media between the calling terminal and the called terminal is early media, the service application server sends a second temporary response confirmation message to the called terminal through a multimedia telephone application server;

during the period that the called terminal plays the color ring, the service application server receives an updating message from the multimedia telephone application server, wherein the updating message carries the color ring media information of the called terminal;

and the service application server sends the polyphonic ringtone media information of the called terminal to the calling session control function network element, receives second SDP response information from the calling session control function network element, and sends the second SDP response information to the multimedia telephone application server so as to enable the polyphonic ringtone media information of the called terminal to take effect and play polyphonic ringtone.

In one possible design, before sending the first message to the calling session control function network element, the method further includes:

the service application server receives the first message from the multimedia telephony application server.

In a possible design, the receiving, by the service application server, a first session initiation protocol SIP message from the called terminal, deleting a second SDP information body in the SIP message, and sending, to the calling session control function network element, the first SIP message with the second SDP information body deleted, includes:

the service application server receives a first SIP message from the called terminal, and the second SDP information body in the first SIP message carries the color ring media information of the called terminal;

the service application server determines that the called terminal has the color ring service according to the color ring media information;

when the session media between the calling terminal and the called terminal is non-early media, the service application server deletes the color ring back tone media information in the second SDP information body, and sends the first SIP message after deleting the color ring back tone media information to the calling session control function network element.

In a possible design, after the service application server receives a first SIP message from the called terminal, before the service application server sends the first SIP message to the calling session control function network element after the color ring media information is deleted, the method further includes:

and after receiving the SIP message from the called terminal, the service application server deletes the SDP information body in the SIP message.

In a second aspect, the present application provides a method for media session processing, the method comprising:

before a calling session management function network element receives a first 200OK response from a called terminal from a service application server, the calling session management function network element receives a first switching request message from the calling terminal, wherein the first 200OK response refers to a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, the first switching request message carries a first Session Description Protocol (SDP) information body, and the first switching request message is used for indicating the calling terminal to have network switching;

the calling session management function network element sends the first switching request message to a service application server;

the calling session management function network element receives a temporary response from the service application server, wherein the temporary response is used for network switching of the calling terminal and is generated according to the first SDP information body;

and the calling session management function network element performs network switching on the calling terminal and sends a first temporary response confirmation message to the service application server, wherein the first temporary response confirmation message is used for indicating the calling terminal to complete network switching.

Compared with the existing mechanism, in the method, the network element with the calling session management function receives the first switching request message of the calling terminal, forwards the first switching request message to the service application server, and completes network switching of the calling terminal according to the temporary response received from the service application server. Therefore, the temporary response is constructed by the service application server based on the first SDP information body, so that the situation that the network switching of the calling terminal is rejected before the media negotiation between the calling terminal and the called terminal is not completed when the network element of the calling session management function does not acquire the switching capability of the IMS core network side can be avoided; or, it can also avoid that the network switch of the calling terminal is determined when the calling terminal and the called terminal do not finish the media negotiation.

In one possible design, after sending the first temporary response confirmation message to the business application server, the method further includes:

the calling session management function network element receives a notification message from the service application server, wherein the notification message is used for indicating the session state of the calling terminal;

and the calling session management function network element sends a notification response to the service application server.

the calling session management function network element receives a first Session Initiation Protocol (SIP) message from the called terminal from the service application server, wherein the first SIP message does not carry an SDP information body;

and the calling session management function network element sends a first SIP message to the calling terminal, wherein the first SIP message is used for requesting to establish media session connection between the calling terminal and the called terminal.

the calling session management function network element receives a first message from the service application server, wherein the first message is used for acquiring media information of the calling terminal and is used for renegotiation between the calling terminal and the called terminal, and the first message does not carry an SDP (service description protocol) information body;

the calling session management function network element sends a second 200OK response to the service application server, wherein the second 200OK response carries the media description information of the calling terminal;

and the calling session management function network element receives SDP response information of a second switching request message from the called terminal from the service application server, and sends the first SDP response information to the calling terminal.

In one possible design, the method further includes:

the calling session control function network element receives the color ring media information of the called terminal from the service application server;

and the calling session control function network element sends second SDP response information to the service application server, wherein the second SDP response information is used for confirming the effect of the color ring media information of the called terminal.

A third aspect of the present application provides a service application server having a function of implementing the method for media session processing provided corresponding to the first aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions, which may be software and/or hardware. In one possible design, the service application server includes a transceiver module and a processing module, and the processing module is configured to control transceiving operations of the transceiver module:

the processing module is configured to receive, by the transceiver module, a first handover request message from a calling session management function network element and determine that media negotiation between a calling terminal and a called terminal is not completed before the transceiver module receives a first 200OK response from the called terminal, where the first 200OK response is a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, the first handover request message is used to indicate that a network handover occurs in the calling terminal, and the first handover request message carries a first session description protocol SDP body;

the transceiver module is further configured to acquire the first SDP body from the first handover request message, generate a temporary response according to the first SDP body, and send the temporary response to the calling session control function network element, where the temporary response is used for network handover of the calling terminal; and receiving a first temporary response confirmation message from the calling session control function network element, wherein the first temporary response confirmation message is used for indicating the calling terminal to complete network switching.

In one possible design, the first SDP body includes media description information of the calling terminal; the processing module is used for:

In one possible design, after the transceiver module receives the first temporary response confirmation message from the calling session control function network element, the processing module is further configured to:

In one possible design, the transceiver module, after receiving the first temporary response confirmation message from the calling session control function network element, is further configured to:

sending a notification message to the calling session control function network element, wherein the notification message is used for indicating the session state of the calling terminal; when the network of the calling terminal is switched to the single standby voice continuous bSRVCC before ringing, the session state is the advanced ringing; and when the network of the calling terminal is switched to the single-standby voice continuous aRVCC after ringing and before answering, the session state is early receiving.

And receiving a notification response from the calling session control function network element.

In one possible design, the processing module is to:

sending a first message to the calling session control function network element through the transceiver module, wherein the first message is used for acquiring media description information of the calling terminal and for renegotiation between the calling terminal and the called terminal, and the first message does not carry an SDP (service description protocol) information body;

receiving a second 200OK response from the calling session control function network element through the transceiver module, wherein the second 200OK response carries the media description information of the calling terminal;

when the media information of the media stream transmitted and received by the calling terminal is determined to be inconsistent with the media information of the media stream transmitted and received by the called terminal, a second switching request message is sent to the called terminal through the transmitting and receiving module, and the second switching request message carries the media description information of the calling terminal;

receiving first SDP response information from the called terminal to the second switching request message through the transceiver module, wherein the first SDP response information comprises target media information used when the called terminal and the calling terminal carry out voice call;

and sending the first SDP response information to the calling session control function network element through the transceiver module.

In one possible design, before the processing module triggers a media renegotiation procedure between the calling terminal and the called terminal after the transceiver module receives the first temporary response confirmation message from the calling session control function network element, the processing module is further configured to:

receiving a first Session Initiation Protocol (SIP) message from the called terminal through the transceiver module, deleting a second SDP information body in the first SIP message, and sending a first SIP message after deleting the second SDP information body to the calling session control function network element, wherein the first SIP message is used for requesting to establish media session connection between the calling terminal and the called terminal.

In a possible design, after the transceiver module receives the first 200OK response from the called terminal, before the transceiver module sends the first SIP message with the second SDP information body deleted to the calling session control function network element, the transceiver module is further configured to:

when the session media between the calling terminal and the called terminal is early media, a second temporary response confirmation message is sent to the called terminal through a multimedia telephone application server;

receiving an updating message from the multimedia telephone application server during the period that the called terminal plays the color ring, wherein the updating message carries the color ring media information of the called terminal;

and sending the polyphonic ringtone media information of the called terminal to the calling session control function network element, receiving second SDP response information from the calling session control function network element, and sending the second SDP response information to the multimedia telephone application server so as to enable the polyphonic ringtone media information of the called terminal to take effect and play polyphonic ringtone.

In one possible design, before the sending the first message to the calling session control function network element, the transceiver module is further configured to:

receiving the first message from the multimedia telephony application server.

In one possible design, the processing module is to:

receiving a first SIP message from the called terminal through the transceiver module, wherein the second SDP information body in the first SIP message carries the polyphonic ringtone media information of the called terminal;

determining that the called terminal has the color ring service according to the color ring media information;

and when the session media between the calling terminal and the called terminal is non-early media, deleting the polyphonic ringtone media information in the second SDP information body, and sending the first SIP message with the polyphonic ringtone media information deleted to the calling session control function network element through the transceiver module.

In a possible design, after the transceiver module receives the first SIP message from the called terminal, and before the transceiver module sends the first SIP message after the color ring media information is deleted to the calling session control function network element, the processing module is further configured to:

and after receiving the SIP message from the called terminal through the transceiver module, deleting the SDP information body in the SIP message.

A fourth aspect of the present application provides a session control function network element having a function of implementing the method corresponding to the media session processing provided in the second aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions, which may be software and/or hardware. In one possible design, the session control function network element includes a transceiver module and a processing module, and the processing module is configured to control transceiver operations of the transceiver module:

the receiving and sending module is configured to receive a first handover request message from a calling terminal before receiving a first 200OK response from a called terminal from a service application server, where the first 200OK response is a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, and the first handover request message carries a first Session Description Protocol (SDP) information body and is used to indicate that the calling terminal performs network handover;

sending the first switching request message to a service application server;

receiving a temporary response from the service application server, wherein the temporary response is used for network switching of the calling terminal and is generated according to the first SDP information body;

the processing module is configured to perform network handover on the calling terminal, and send a first temporary response acknowledgement message to the service application server through the transceiver module, where the first temporary response acknowledgement message is used to indicate that the calling terminal completes network handover.

In one possible design, after sending the first temporary response confirmation message to the service application server, the transceiver module is further configured to:

receiving a notification message from the service application server, wherein the notification message is used for indicating the session state of the calling terminal;

and sending a notification response to the service application server.

receiving a first Session Initiation Protocol (SIP) message from the called terminal from the service application server, wherein the first SIP message does not carry an SDP information body;

and sending a first SIP message to the calling terminal, wherein the first SIP message is used for requesting to establish media session connection between the calling terminal and the called terminal.

receiving a first message from the service application server, where the first message is used to acquire media information of the calling terminal and is used for renegotiation between the calling terminal and the called terminal, and the first message does not carry an SDP body;

sending a second 200OK response to the service application server, wherein the second 200OK response carries the media description information of the calling terminal;

and receiving SDP response information from the called terminal to a second switching request message from the service application server, and sending the first SDP response information to the calling terminal.

In one possible design, the transceiver module is further configured to:

receiving the color ring media information of the called terminal from the service application server;

and sending second SDP response information to the service application server, wherein the second SDP response information is used for confirming the color ring back tone media information of the called terminal.

Yet another aspect of the present application provides an apparatus for media session processing, the apparatus comprising:

at least one processor, memory, and transceiver;

wherein the memory is configured to store program code, and the processor is configured to invoke the program code stored in the memory to perform the operations performed by the service application server as in the first aspect above, or to perform the operations performed by the calling session management function network element as in the second aspect. Wherein the transceiver may also be replaced by a receiver and a transmitter, which may be the same or different physical entities. When the same physical entity, may be collectively referred to as a transceiver. The memory may be integrated in the processor or may be provided separately from the processor.

A further aspect of the present application provides a computer storage medium containing instructions that, when executed on a computer, cause the computer to perform the operations performed by the service application server as in the first aspect, or the operations performed by the calling session management function network element as in the second aspect.

Drawings

FIG. 1 is a schematic topology diagram of a communication system in an embodiment of the present application;

fig. 2 is a schematic flowchart of a method for processing a media session in an embodiment of the present application;

fig. 3 is a schematic diagram illustrating a media renegotiation process between a calling terminal and a called terminal in an embodiment of the present application;

fig. 4 is a schematic diagram illustrating a media renegotiation process between a calling terminal and a called terminal in an embodiment of the present application;

fig. 5 is a schematic view of a color ring back tone service flow under an early media scene in the embodiment of the present application;

fig. 6 is a schematic diagram of a color ring back tone service flow under a non-early media scene in the embodiment of the present application;

fig. 7 is a schematic structural diagram of a service application server in the embodiment of the present application;

fig. 8 is a schematic structural diagram of a session management function network element in an embodiment of the present application;

fig. 9 is a schematic structural diagram of an apparatus for media session processing in an embodiment of the present application;

fig. 10 is a schematic structural diagram of a server in an embodiment of the present application.

Detailed Description

The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprise," "include," and "have," and any variations thereof, are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to those steps or modules expressly listed, but may include other steps or modules not expressly listed or inherent to such process, method, article, or apparatus, the division of modules presented herein is merely a logical division that may be implemented in a practical application in a further manner, such that a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not implemented, and such that couplings or direct couplings or communicative coupling between each other as shown or discussed may be through some interfaces, indirect couplings or communicative coupling between modules may be electrical or other similar forms, this application is not intended to be limiting. The modules or sub-modules described as separate components may or may not be physically separated, may or may not be physical modules, or may be distributed in a plurality of circuit modules, and some or all of the modules may be selected according to actual needs to achieve the purpose of the present disclosure.

The application provides a method, a device and a storage medium for media session processing, which are used for centralized services in an IMS core network, for example, the centralized services can be media sessions, the media sessions can include voice calls, video calls and the like, and the centralized services can be single sessions or multiple sessions. In the communication system architecture shown in fig. 1, the IMS core network includes a calling session management function network element and a service application server.

In the coverage of the LTE network, the called and calling terminals register with the IMS core network through an Evolved Packet Core (EPC) network. During the calling process, the signaling and the media are sent to the IMS core network through the EPC network to complete the processing of the signaling and the connection of the media. Both the calling terminal and the called terminal can perform SIP signaling interaction with the IMS core network.

The calling session management function network element is used as an entrance for visiting the IMS core network, and is responsible for forwarding the message sent by the calling terminal or the called terminal side to the home network of the terminal and sending the message from the home network of the terminal to the corresponding terminal side. The calling session management function network element in the application is used for controlling the processing of signaling and the switching of media. The calling session management function network element in the present application may integrate a proxy-call session control function (P-CSCF) and an Access Transfer Control Function (ATCF). The P-CSCF is the first entity that a user is exposed to in the IMS core network. The P-CSCF is the first contact node (in the signalling plane) for a user in the IMS, and from a SIP point of view it is an outbound/inbound SIP proxy server, and all SIP signalling, whether from or to a terminal (e.g. a calling or called terminal), must pass through the P-CSCF. The calling terminal or the called terminal may obtain an address of the P-CSCF using a local Call Session Control Function (CSCF) discovery mechanism. The P-CSCF is responsible for validating the request, forwarding it to the specified target, and processing and forwarding the response.

The service application server is used for establishing and controlling IMS session for the calling terminal and the called terminal, providing the function of access domain selection for the called terminal, and being responsible for completing the switching process and updating the media information of the called terminal. The service application server in the present application may be a service centralized and continuous application server (SCC AS).

It should be noted that the terminal referred to in this application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem. A wireless terminal, which may be a mobile terminal such as a mobile phone (or a "cellular" phone) and a computer having a mobile terminal, for example, a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device, may communicate with one or more core networks via a Radio Access Network (RAN). For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDA), and the like. A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a Terminal Device, a User Agent (User Agent), a User Device (User Device), or a User Equipment (User Equipment).

In the existing mechanism, as long as a dedicated bearer is established in a handover standard of the RAN side, it is considered that network handover can be performed, and only signal quality and media negotiation signaling are concerned. However, for IMS, it is necessary to perform network handover after the negotiation between the calling terminal and the called terminal is completed. So there is a contradiction between the two: when the dedicated bearer is established but the media negotiation is not completed, the calling terminal is switched. This problem is to be solved. In the IMS handover standard of the existing mechanism, a network element having a calling session management function determines whether network handover can be performed for a calling terminal according to handover capability of a core network side, and a service application server rejects the network handover of the calling terminal because media negotiation is not completed between two sides of a calling terminal and a called terminal. In addition, the network handover of the calling terminal fails, which may result in a call drop between the calling and called terminals. In order to solve the technical problems, the application mainly provides the following technical scheme:

before media negotiation between a calling terminal and a called terminal is not completed, if a service application server receives a switching request message from the calling terminal from a calling session management function network element, the service application server can construct a temporary medium (also called a false medium) according to an SDP information body carried in the switching request message, and the temporary medium is utilized to respond to the calling session management function network element, so that the media on both sides of the calling terminal and the called terminal are terminated. Then the calling session management function network element completes the SRVCC handover in the scene that the media negotiation is not completed based on the temporary media. After the calling terminal completes the SRVCC switching, the service application server performs the media renegotiation on both sides of the calling terminal equipment and the called terminal equipment in the called answering process, thereby ensuring the media connection. Through the mechanism, the SRVCC switching of the calling terminal can be realized under the scene that the media negotiation is not completed at the two sides of the calling terminal and the called terminal, and the media renegotiation processes at the two sides of the calling terminal and the called terminal are triggered after the SRVCC switching is completed at the calling terminal, so that the media communication at the two sides of the calling terminal and the called terminal is ensured, and the call is not dropped.

The SDP information in the present application is used for media negotiation between two session entities, and is agreed. The SDP body in this application includes session name and purpose, session survival time, media description information, addresses, ports and formats required for receiving media, etc., bandwidth information and access information. The media description information includes media type, transport protocol, media format, and multicast or unicast address and port. The media type may include polyphonic ringtone media.

In addition, the SRVCC handover in the present application relates to single radio voice communication before ringing (bSRVCC) handover and single radio voice communication after ringing in alerting (aSRVCC) handover. For example, a bSRVCC handover refers to an SRVCC handover that occurs before the called rings (i.e., 180 Ring); the aSRVCC handover refers to SRVCC handover that occurs after a called party rings (i.e., 180Ring) until it goes off-hook (i.e., 200OK response).

Referring to fig. 2, the following description provides a method for media session processing, which is used before media negotiation between a calling terminal and a called terminal is not completed, that is, before a service application server receives a first 200OK response from the called terminal (at this time, a calling session control function network element does not receive the first 200OK response either), where the first 200OK response is a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, and if the calling terminal receives the first 200OK response, it indicates that media negotiation between the calling terminal and the called terminal is completed. The 200OK response in the embodiment of the present application may be a SIP message. The method comprises the following steps:

201. before the calling session management function network element receives the first 200OK response from the called terminal from the service application server, the calling session management function network element receives a first handover request message from the calling terminal.

Wherein, the first switching request message is used for indicating the network switching of the calling terminal. The first switching request message carries a first Session Description Protocol (SDP) information body, and the first SDP information body comprises media description information of the calling terminal.

202. And the calling session management function network element sends the first switching request message to the service application server.

Even if the calling session management function network element does not acquire the switching capability of the core network side through 180 message interaction at this time, the calling session management function network element also sends the first switching request message to the service application server, and network switching of the calling terminal cannot be directly refused because the switching capability of the core network side is not acquired.

203. And the service application server receives the first switching request message from the calling session management function network element and determines that the media negotiation between the calling terminal and the called terminal is not completed.

204. And the service application server acquires the first SDP information body from the first switching request message and generates a temporary response according to the first SDP information body.

In some embodiments, the service application server may generate the temporary response according to the codec of the media description information of the calling terminal, for example, the temporary response may be generated according to the first codec of the media description information of the calling terminal, or may be another predefined codec of the media description information of the calling terminal, and the application does not limit which codec of the media description information of the calling terminal is agreed to be used.

205. And the service application server sends the temporary response to the calling session control function network element.

Wherein the temporary response is used for network handover of the calling terminal.

206. And the calling session management function network element receives a temporary response from the service application server and performs network switching on the calling terminal.

207. And the calling session management function network element sends a first temporary response confirmation message to the service application server.

Wherein, the first temporary response confirmation message is used for indicating the calling terminal to complete network switching.

208. And the service application server receives a first temporary response confirmation message from the calling session control function network element.

In some embodiments, after the service application server receives the first temporary response confirmation message from the calling session control function network element, the method further includes:

and the service application server sends a notification message to the calling session control function network element, wherein the notification message is used for indicating the session state of the calling terminal. When the network of the calling terminal is switched to single standby voice continuous bSRVCC before ringing, the session state is early ringing (pre-alerting); when the network of the calling terminal is switched to single standby voice continuous aRVCC after ringing and before answering, the session state is early receiving (early _ receiver).

Thus, after the calling session control function network element sends the notification message to a single standby voice continuous interworking function network element (SRVCC IWF), the SRVCC IWF switches the session to a corresponding Call proceeding or Call accepted state according to the session state (e.g., pre-alerting or early _ received) indicated in the notification message, and sets information such as the Call direction, the session duration, and the like of the media session at the same time to ensure the normal operation of the subsequent media session. And the SRVCC IWF sends a notification response to the calling session control function network element.

And the calling session control function network element sends a notification response to the service application server.

In the embodiment of the application, after receiving a first switching request message from a calling terminal, a service application server responds to a calling session management function network element by constructing a temporary response mode according to a first SDP information body, so that even if the calling session management function network element does not acquire the switching capability of an IMS core network side, the network switching of the calling terminal before the calling terminal and a called terminal do not complete media negotiation can be realized; even if the calling terminal and the called terminal do not finish the media negotiation, the network element of the calling session management function can also switch the network of the calling terminal.

Optionally, in some embodiments of the present application, since the above steps 201 to 208 all occur before the media negotiation between the calling terminal and the called terminal is not completed, the called terminal still responds to the media negotiation request of the calling terminal. Therefore, after step 208, since the calling terminal has performed network handover, the media negotiation may be regarded as invalid, and even if the first 200OK response is received from the called terminal, the procedure of the media negotiation needs to be terminated. After terminating the media negotiation, in order to ensure a high-quality media session between the calling terminal and the called terminal, a media renegotiation process is required between the calling terminal and the called terminal, where the method further includes:

209. and after receiving the first SIP message from the called terminal, the service application server deletes the second SDP information body in the first SIP message.

And by deleting the second SDP information body, the response confirmation response of the called terminal to the media negotiation request of the calling terminal is terminated, and preparation is made for triggering a new media negotiation flow after the network switching of the calling terminal is completed.

210. And the service application server sends the first SIP message after deleting the second SDP information body to the calling session control function network element.

The first SIP message in this step is used to request to establish a media session connection between the calling terminal and the called terminal. In some embodiments, the first SIP message may be the aforementioned first 200OK response, 183 message, or 180 message. In some embodiments, in the SRVCC handover procedure for the calling terminal, if the service application server receives the SIP signaling (e.g., 183 message) from the called terminal, the service application server will terminate any response message from the called terminal in the handover procedure by deleting the SDP body in the SIP signaling.

211. The calling session management function network element receives the first SIP message from the called terminal from the service application server, and sends the first SIP message received in step 211 to the calling terminal.

Wherein the first SIP message does not carry the second SDP information body. The first SIP message received in this step 211 is used to request to establish a media session connection between the calling terminal and the called terminal.

212. And the calling terminal sends a session connection confirmation message to the calling session management function network element, and the media session connection is reestablished between the calling terminal and the called terminal.

After establishing media session connection between a calling terminal and a called terminal, the service application server triggers a media renegotiation process between the calling terminal and the called terminal, so that media negotiation is completed between the calling terminal and the called terminal, and further media session between the calling terminal and the called terminal is guaranteed.

For example, if the network handover of the calling terminal occurs this time is to be a bSRVCC for which the media negotiation is not completed, after the network handover of the calling terminal occurs, the called terminal will respond to a 180(Alerting) ringing message and a 200OK message, and the service application server needs to delete an SDP in the responded 200OK message. Then, the calling side responds to the session connection acknowledge message (Connect Ack), and the sending of the session connection acknowledge message indicates the signaling connection of the call.

For another example, if the network of the calling terminal is switched to the aSRVCC with incomplete media negotiation, after the network of the calling terminal is switched to the aSRVCC with incomplete media negotiation, the called terminal will respond to the 200OK message, and the service application server also needs to delete the SDP carried in the 200OK message. Then, the calling terminal responds to the session connection acknowledge message (Connect Ack), and the sending of the session connection acknowledge message indicates that the call is signaled to be connected.

Optionally, in some embodiments of the present application, as shown in fig. 4, the media renegotiation process may include steps 2121 to 2126 as follows:

step 2121, the service application server sends a first message to the calling session control function network element.

The first message is used for acquiring the media description information of the calling terminal and for renegotiation between the calling terminal and the called terminal, and the first message does not carry an SDP information body.

The first message may be generated by a service application server or a multimedia telephony application server. In some embodiments, before the service application server sends the first message to the calling session control function network element, the method further includes:

2122. And the calling session management function network element receives the first message from the service application server and sends a second 200OK response to the service application server.

Wherein, the second 200OK response carries the media description information of the calling terminal, for example, carrying SDP-IWF of the calling terminal. The media description information in the second 200OK response may be obtained through interaction with the SRVCC IWF, which is not described in detail in this embodiment of the present application, and the SRVCC IWF message is omitted in this application.

2123. And the service application server receives a second 200OK response from the calling session control function network element, and when the media information of the media stream received and transmitted by the calling terminal is determined to be inconsistent with the media information of the media stream received and transmitted by the called terminal, the service application server sends a second switching request message to the called terminal.

Wherein, the second handover request message carries the media description information of the calling terminal. Similarly, the SIP signaling between the service application server and the called terminal is also omitted, and the message from the called terminal can be regarded as the message sent by the called terminal to the service application server, and similar parts are not described in detail.

2124. The called terminal sends first SDP response information to the service application server.

The first SDP Answer information is an Answer of the called terminal to the second handover request message, such as SDP-Answer, and the first SDP Answer information includes target media information used when the called terminal and the calling terminal perform a voice call.

2125. And the service application server receives first SDP response information from the called terminal and sends the first SDP response information to the calling session control function network element.

2126. And the calling session management function network element receives first SDP response information from the called terminal from the service application server and sends the first SDP response information to the calling terminal.

After step 2126, after the calling terminal receives the first SDP answer message, media renegotiation is completed between the calling terminal and the called terminal, and normal media conversation can be performed after media between the calling terminal and the called terminal is connected. Therefore, the media renegotiation process provided in the embodiment of the application can be used for ensuring the call drop of the media session in the VoLTE network, thereby ensuring that the call drop is not generated when the calling terminal performs SRVCC handover.

Optionally, in some embodiments of the present application, if the network switch of the calling terminal occurs this time is bSRVCC switch, then after the bSRVCC switch is completed (that is, after the service application server receives the first 200OK response from the called terminal, before the calling terminal sends the first SIP message to the calling session control function network element after deleting the second SDP information body), the called terminal may have a scenario of a color ring, for example, an early media scenario and a non-early media scenario, and there are two ways to play the color ring at the calling terminal;

firstly, when the session media between the calling terminal and the called terminal is early media.

As shown in fig. 5, the embodiment of the present application further includes:

213a, the service application server sends a second temporary response confirmation message to the called terminal through the multimedia telephony application server.

214a, during the period that the called terminal plays the color ring, the service application server receives the update message from the multimedia telephone application server.

Wherein, the update message carries the color ring media information of the called terminal.

215a, the service application server sends the color ring media information of the called terminal to the network element of the calling session control function.

216a, the calling session control function network element receives the color ring media information of the called terminal from the service application server, and the calling session control function network element sends a second SDP answer information to the service application server.

Wherein, the second SDP Answer information (i.e. SDP-Answer) is used for validation of the polyphonic ringtone media information of the called terminal.

217a, the service application server receives a second SDP answer message from the calling session control function network element, and sends the second SDP answer message to the multimedia telephone application server, so that the polyphonic ringtone media information of the called terminal takes effect and plays polyphonic ringtone.

In the early media scenario of the embodiment of the present application, since the update message carries the polyphonic ringtone media information of the called terminal, the polyphonic ringtone media of the called terminal is still valid, and the calling terminal can hear the polyphonic ringtone of the called terminal. And when the user of the calling terminal hooks off, stopping playing the color ring of the called terminal, and entering a media renegotiation process between the calling terminal and the called terminal and reestablishing media session connection between the calling terminal and the called terminal.

And secondly, when the session media between the calling terminal and the called terminal is non-early media.

As shown in fig. 6, in this embodiment of the application, the receiving, by the service application server, a first SIP message from the called terminal, deleting a second SDP information body in the SIP message, and sending, to the calling session control function network element, the first SIP message after deleting the second SDP information body includes:

213b, the called terminal sends a first SIP message to the service application server.

And the second SDP information body in the first SIP message carries the color ring media information of the called terminal.

214b, the service application server receives a first SIP message from the called terminal, and determines that the called terminal has a color ring service according to the color ring media information.

215b, when the session media between the calling terminal and the called terminal is non-early media, the service application server deletes the polyphonic ringtone media information in the second SDP information body.

And deleting the polyphonic ringtone media information in the second SDP information body to disable the polyphonic ringtone media of the called terminal.

216b, the service application server sends the first SIP message after deleting the polyphonic ringtone media information to the calling session control function network element.

217b, the calling session control function network element sends the first SIP message received in step 216b to the calling terminal.

In the non-early media scenario of the embodiment of the present application, since the polyphonic ringtone media information in the second SDP information body is deleted in step 215b, so that the polyphonic ringtone media of the called terminal is invalid, when the network of the calling terminal is switched to bSRVCC switching in which the media negotiation is not completed, the calling terminal cannot hear the polyphonic ringtone of the called terminal. Then, the service application server also receives a first 200OK response sent by the called terminal, where the first 200OK response may be the first SIP message in step 209, and the service application server needs to terminate the first 200OK response, that is, delete the second SDP information body in the first 200OK response, and enter a media renegotiation process between the calling terminal and the called terminal to reestablish a media session connection between the calling terminal and the called terminal.

The service application server in the embodiment of the present application can implement the steps in the media session processing flow executed by the service application server in the embodiment corresponding to any one of fig. 2 to fig. 6. The functions realized by the service application server can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions, which may be software and/or hardware. As shown in fig. 7, the service application server may include a transceiver module and a processing module, and the function of the processing module may refer to operations of generating a temporary response and deleting an SDP body by the service application server in any one of embodiments corresponding to fig. 2 to 6, which are not described herein again. The function of the transceiver module may be implemented by referring to the transceiving operations of receiving, by the service application server, the first 200OK response, sending the temporary response, receiving the temporary response confirmation message, sending the first message, and the like in the embodiment corresponding to any one of fig. 2 to fig. 6, and the processing module may be configured to control the transceiving operations of the transceiver module.

In some embodiments, the processing module is configured to receive, by the transceiver module, a first handover request message from a calling session management function network element and determine that media negotiation between a calling terminal and a called terminal is not completed before the transceiver module receives a first 200OK response from the called terminal, where the first 200OK response is a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, the first handover request message is used to indicate that a network handover occurs in the calling terminal, and the first handover request message carries a first session description protocol SDP information body;

In the embodiment of the application, after a transceiver module in a service application server receives a first switching request message from a calling terminal, a processing module responds to a calling session management function network element by constructing a temporary response mode according to a first SDP information body, so that even if the calling session management function network element does not acquire the switching capability of an IMS core network side, network switching of the calling terminal before media negotiation between the calling terminal and a called terminal is not completed can be realized; even if the calling terminal and the called terminal do not finish the media negotiation, the network element of the calling session management function can also switch the network of the calling terminal.

In some embodiments, the first SDP body includes media description information of the calling terminal; the processing module is used for:

In some embodiments, after the transceiver module receives the first temporary response confirmation message from the calling session control function network element, the processing module is further configured to:

In some embodiments, the transceiver module, after receiving the first temporary response confirmation message from the calling session control function network element, is further configured to:

In some embodiments, the processing module is configured to:

In some embodiments, before the processing module triggers a media renegotiation procedure between the calling terminal and the called terminal after the transceiver module receives the first temporary response confirmation message from the calling session control function network element, the processing module is further configured to:

In some embodiments, after the transceiver module receives the first 200OK response from the called terminal, before the transceiver module sends the first SIP message after deleting the second SDP body to the calling session control function network element, the transceiver module is further configured to:

In some embodiments, before the sending the first message to the calling session control function network element, the transceiver module is further configured to:

receiving the first message from the multimedia telephony application server.

In some embodiments, the processing module is configured to:

the device determines that the called terminal has the color ring service according to the color ring media information;

In some embodiments, after the transceiver module receives the first SIP message from the called terminal, and before the transceiver module sends the first SIP message after the color ring media information is deleted to the calling session control function network element, the processing module is further configured to:

The session control function network element in the embodiment of the present application can implement steps in a media session processing flow executed by the calling session control function network element in the embodiment corresponding to any one of fig. 2 to fig. 6. The functions realized by the session control function network element can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions, which may be software and/or hardware. As shown in fig. 8, the session control function network element may include a transceiver module and a processing module, and the processing module may be configured to control transceiver operations of the transceiver module. The function of the processing module may be implemented by referring to the embodiments corresponding to any one of fig. 2 to 6, where the service application server controls the transceiver module to obtain a temporary response, send a temporary response confirmation message, receive a first message, receive an SIP message, receive a notification response, send a first SDP answer message, and so on, which are not described herein again. The function of the transceiver module may be implemented by referring to the transceiver operations of acquiring a temporary response, sending a temporary response confirmation message, receiving a first message, receiving an SIP message, receiving a notification response, sending a first SDP answer message, and the like in the embodiments corresponding to any one of fig. 2 to fig. 6.

In the embodiment of the application, after receiving the first switching request message of the calling terminal, the transceiver module in the session management function network element forwards the first switching request message to the service application server, and the processing module completes network switching of the calling terminal according to the temporary response received from the service application server. Therefore, the temporary response is constructed by the service application server based on the first SDP information body, so that the situation that the network switching of the calling terminal is rejected before the media negotiation between the calling terminal and the called terminal is not completed when the network element of the calling session management function does not acquire the switching capability of the IMS core network side can be avoided; or, it can also avoid that the network switch of the calling terminal is determined when the calling terminal and the called terminal do not finish the media negotiation.

In some embodiments, the transceiver module is configured to receive a first handover request message from a calling terminal before receiving a first 200OK response from a called terminal from a service application server, where the first 200OK response is a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, and the first handover request message carries a first session description protocol SDP information body, and is used to indicate that network handover occurs in the calling terminal;

sending the first switching request message to a service application server;

In some embodiments, after the transceiver module sends the first temporary response confirmation message to the service application server, the transceiver module is further configured to:

and sending a notification response to the service application server.

In some embodiments, the transceiver module is further configured to:

Fig. 9 is a schematic structural diagram of an apparatus for media session processing according to an embodiment of the present disclosure, which may include at least one processor, at least one transceiver, a memory, and at least one bus. Wherein, at least one processor, at least one transceiver and the memory can be connected by a bus or other means, wherein the connection by the bus is taken as an example in fig. 9.

The memory may include both read-only memory and random access memory, and provides instructions and data to the processor. The portion of memory may also include Non-Volatile random access memory (NVRAM). The memory stores an operating system and program instructions, executable modules or data structures, or subsets thereof, or expanded sets thereof, wherein the program instructions may include various operational instructions for performing various operations. The operating system may include various system programs for performing various basic tasks and for handling hardware-based tasks.

The processor may control the operation of the software upgrade managed device, and may also be referred to as a Central Processing Unit (CPU). In a specific application, the components of the software upgrade management device are coupled together by a bus, wherein the bus may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. But for clarity of illustration the various buses are referred to as buses in figure 9.

It should be noted that in the embodiments of the present application (including the embodiments shown in fig. 7 and fig. 8), all entity devices corresponding to the transceiver modules may be transceivers, and all entity devices corresponding to the processing modules may be processors. Each of the devices shown in fig. 7 and 8 may have a structure as shown in fig. 9, when one of the devices has the structure as shown in fig. 9, the processor and the transceiver in fig. 9 implement the same or similar functions of the processing module and the transceiver module provided in the embodiment of the device corresponding to the device, and the memory in fig. 9 stores program codes that the processor needs to call when executing the method of media session processing. Wherein the transceiver may also be replaced by a receiver and a transmitter, which may be the same or different physical entities. When they are the same physical entity, they may be referred to as a transceiver, for example, the transceiver may be a Radio Frequency (RF) circuit. The memory may be integrated in the processor or may be provided separately from the processor.

The methods disclosed in the embodiments of the present application described above may be applied to the processor shown in fig. 9, or may be implemented by the processor shown in fig. 9. For example, in some embodiments, the processor in fig. 9 may call the program instructions stored in the memory, and the processor may specifically execute the program code called when the method of media session processing in the embodiment of the present application is executed.

For example, when the business application server has a structure as shown in fig. 9, the memory in fig. 9 stores program codes that the processor needs to call when executing the above-described method of performing media session processing by the server. Specifically, the processor in FIG. 9 is capable of invoking program code in memory to perform the following operations:

if the transceiver receives a first 200OK response from a called terminal, the transceiver module receives a first switching request message from a calling session management function network element and determines that media negotiation between the calling terminal and the called terminal is not completed, wherein the first 200OK response refers to a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, the first switching request message is used for indicating the calling terminal to perform network switching, and the first switching request message carries a first Session Description Protocol (SDP) information body;

acquiring the first SDP information body from the first switching request message through the transceiver, generating a temporary response according to the first SDP information body, and sending the temporary response to the calling session control function network element, wherein the temporary response is used for network switching of the calling terminal; and receiving a first temporary response confirmation message from the calling session control function network element, wherein the first temporary response confirmation message is used for indicating the calling terminal to complete network switching.

As another example, when the session management function network element has the structure shown in fig. 8, the memory in fig. 8 stores program code that needs to be invoked by the processor to execute the above-described method for performing media session processing by the originating session management function network element. Specifically, the processor in FIG. 8 is capable of invoking program code in memory to perform the following operations:

receiving, by the transceiver, a first handover request message from a calling terminal before receiving a first 200OK response from a called terminal from a service application server, where the first 200OK response is a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, and the first handover request message carries a first Session Description Protocol (SDP) information body and is used to indicate that network handover occurs in the calling terminal;

sending, by the transceiver, the first handover request message to a service application server; receiving a temporary response from the service application server, wherein the temporary response is used for network switching of the calling terminal and is generated according to the first SDP information body;

and performing network switching on the calling terminal, and sending a first temporary response confirmation message to the service application server through the transceiver, wherein the first temporary response confirmation message is used for indicating the calling terminal to complete network switching.

In another server provided in this embodiment of the present application, as shown in the schematic structural diagram shown in fig. 10, the server 1020 may generate relatively large differences due to different configurations or performances, and may include one or more Central Processing Units (CPUs) 1022 (e.g., one or more processors), an input/output interface 1058 and a memory 1032, and may further include one or more storage media 1030 (e.g., one or more mass storage devices) for storing an application program 1042 or data 1044.

The central processor 1022 may be configured to communicate with the storage medium 1030, and execute a series of instruction operations in the storage medium 1030 on the server 1020. Among them, the CPU1022 may correspond to the processing module in fig. 7 or the processor shown in fig. 9, and the storage medium 1030 may correspond to the memory shown in fig. 9.

The input-output interface 1058 may correspond to the transceiver module in fig. 7 or the transceiver shown in fig. 9.

Memory 1032 and storage medium 1030 may be transient or persistent storage, and a program stored on storage medium 1030 may include one or more modules (not shown), each of which may include a series of instructions operating on a server.

The Server 1020 may also include one or more power supplies 1026, one or more wired or wireless network interfaces 1050, one or more input-output interfaces 1058, and/or one or more operating systems 1041, such as Windows Server, Mac OS X, Unix, Linux, FreeBSD, etc.

The steps performed by the business application server in the embodiments described above may be based on the server architecture shown in fig. 10.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the module described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.

The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.

The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The technical solutions provided by the present application are introduced in detail, and the present application applies specific examples to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understand the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A method of media session processing, the method comprising:

if a service application server receives a first switching request message from a calling session management function network element before receiving a first 200OK response from a called terminal, the service application server determines that media negotiation between the calling terminal and the called terminal is not completed, the first 200OK response refers to a response confirmation response of the called terminal to a media negotiation request initiated by the calling terminal, the first switching request message is used for indicating the calling terminal to perform network switching, and the first switching request message carries a first Session Description Protocol (SDP) information body;

2. The method of claim 1, wherein the first SDP body comprises media description information of the calling terminal; the generating a temporary response according to the first SDP body of information includes:

3. The method according to claim 1 or 2, wherein after the service application server receives the first temporary response confirmation message from the calling session control function network element, the method further comprises:

4. The method of claim 3, wherein after the service application server receives the first temporary response confirmation message from the calling session control function network element, the method further comprises:

the service application server sends a notification message to the calling session control function network element, wherein the notification message is used for indicating the session state of the calling terminal; when the network of the calling terminal is switched to the single standby voice continuous bSRVCC before ringing, the session state is the advanced ringing; when the network of the calling terminal is switched to single-standby voice continuous aRVCC after ringing and before answering, the session state is early receiving;

5. The method according to claim 4, wherein the triggering the media renegotiation procedure between the calling terminal and the called terminal comprises:

6. The method of claim 5, wherein after the service application server receives the first temporary response confirmation message from the calling session control function network element and before the triggering of the media renegotiation procedure between the calling terminal and the called terminal, the method further comprises:

7. The method as claimed in claim 6, wherein after the service application server receives the first 200OK response from the called terminal, and before the service application server sends the first SIP message after deleting the second SDP body to the calling session control function network element, the method further comprises:

8. The method of claim 7, wherein before sending the first message to the calling session control function network element, the method further comprises:

9. The method as claimed in claim 6, wherein the service application server receives a first session initiation protocol SIP message from the called terminal, deletes a second SDP body in the SIP message, and sends the first SIP message with the second SDP body deleted to the calling session control function network element, including:

10. The method of claim 9, wherein after the service application server receives a first SIP message from the called terminal, before the service application server sends the first SIP message after the color ring media information is deleted to the calling session control function network element, the method further comprises:

11. A method of media session processing, the method comprising:

12. The method of claim 11, wherein after sending the first temporary response acknowledgment message to the business application server, the method further comprises:

13. The method of claim 12, wherein after sending the first temporary response acknowledgment message to the business application server, the method further comprises:

14. The method according to claim 12 or 13, wherein after sending the first temporary response acknowledgement message to the service application server, the method further comprises:

15. The method of claim 14, further comprising:

16. A service application server, wherein the service application server includes a transceiver module and a processing module, and the processing module is configured to control the transceiver module to perform transceiving operations:

17. The service application server of claim 16, wherein the first SDP body includes media description information of the calling terminal; the processing module is used for:

18. The service application server according to claim 16 or 17, wherein the processing module, after the transceiver module receives the first temporary response confirmation message from the calling session control function network element, is further configured to:

19. The service application server of claim 18, wherein the transceiver module, after receiving the first temporary response confirmation message from the calling session control function network element, is further configured to:

sending a notification message to the calling session control function network element, wherein the notification message is used for indicating the session state of the calling terminal; when the network of the calling terminal is switched to the single standby voice continuous bSRVCC before ringing, the session state is the advanced ringing; when the network of the calling terminal is switched to single-standby voice continuous aRVCC after ringing and before answering, the session state is early receiving;

20. The business application server of claim 19, wherein the processing module is configured to:

21. The service application server of claim 20, wherein the processing module, before the transceiver module receives the first temporary response confirmation message from the calling session control function network element and the processing module triggers a media renegotiation procedure between the calling terminal and the called terminal, is further configured to:

22. The service application server of claim 21, wherein after the transceiver module receives the first 200OK response from the called terminal, before the transceiver module sends the first SIP message with the second SDP information body deleted to the calling session control function network element, the transceiver module is further configured to:

23. The service application server of claim 22, wherein before the transceiver module sends the first message to the calling session control function network element, the transceiver module is further configured to:

receiving the first message from the multimedia telephony application server.

24. The business application server of claim 21, wherein the processing module is configured to:

25. The service application server of claim 24, wherein after the transceiver module receives the first SIP message from the called terminal, and before the transceiver module sends the first SIP message after deleting the color ring media information to the calling session control function network element, the processing module is further configured to:

26. A network element with session management function, wherein the network element with session management function comprises a transceiver module and a processing module, and the processing module is configured to control transceiver operations of the transceiver module:

sending the first switching request message to a service application server;

27. The network element of claim 26, wherein after the transceiver module sends the first temporary response confirmation message to the service application server, the transceiver module is further configured to:

and sending a notification response to the service application server.

28. The network element of claim 27, wherein after the transceiver module sends the first temporary response acknowledgement message to the service application server, the transceiver module is further configured to:

29. The session management function network element of claim 27 or 28, wherein after sending the first temporary response acknowledge message to the service application server, the transceiver module is further configured to:

30. The session management function network element of claim 29, wherein the transceiver module is further configured to:

31. An apparatus for media session processing, the apparatus comprising:

at least one processor, memory, and transceiver;

wherein the memory is configured to store program code and the processor is configured to invoke the program code stored in the memory to perform the operations performed by the service application server in any of claims 1-10 or to perform the operations performed by the calling session management function network element in any of claims 11-15.

32. A computer storage medium, characterized in that it contains instructions which, when run on a computer, cause the computer to perform the operations performed by the service application server as in any of claims 1-10, or the operations performed by the calling session management function network element as in any of claims 11-15.