WO2012113240A1 - Multimedia session negotiation method, related device and system - Google Patents

Abstract

Disclosed are a multimedia session negotiation method, a related device and a system. The multimedia session negotiation method comprises: a called terminal receiving a first session negotiation message from a calling terminal, attribute parameters carried in a session description protocol (SDP) packet in the first session negotiation message containing a media parameter and a media redundancy parameter of at least two media; the called terminal selecting, according to a local session capability, an attribute parameter carried in the received SDP packet; the called terminal generating a new SDP packet according to the selected attribute parameter; and the called terminal sending the generated SDP packet to the calling terminal through a second session negotiation message. The technical solution provided in the present invention effectively solves the problem in the prior art that redundancy can only be performed on a single type of medium in a session.

Description

 Method for negotiating multimedia session, related device and system The application is submitted to the Chinese Patent Office on February 22, 2011, the application number is 201110043386.0, and the invention name is "a negotiation method of a multimedia session, related equipment and system" Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

 The present invention relates to the field of communications, and in particular, to a method, a related device, and a system for negotiating a multimedia session.

Background technique

 With the wide application of multimedia conferencing, people's requirements for the quality of service of multimedia applications are also increasing. In practical applications, there are many factors affecting the quality of multimedia conferences. The most obvious one is the packet loss problem, and data redundancy is proposed as one of the solutions to this problem.

 Data redundancy refers to the technology of storing the same data in different data packets. If the average continuous packet loss rate is low, if a data packet is lost during transmission, the receiver can still pass the subsequent data packet. The redundant data in the data reorganizes and recovers the lost data information to avoid the problem of poor voice quality caused by packet loss. At present, data redundancy has been widely applied and formed a request for comment (RFC, Request). For Comments) 2198 standard.

 Currently, the Session Description Protocol (SDP) is used to restrict the redundancy of the media in the session. The calling party and the receiver establish a session through a Session Initiation Protocol (SIP) message. The SDP data carried in the SIP message is used for session negotiation (such as negotiation of media redundancy, media format, media codec, media receiving address, port, etc.).

 However, the RFC 2198 standard described above only describes SDP for a single type of data redundancy capability. That is, based on the existing RFC 2198 standard, the calling party and the called party can only negotiate the redundancy capability of a single type of media. However, There are often multiple media types (such as voice, video, etc.) in a session. Therefore, existing methods that can only negotiate the redundancy capabilities of a single type of media have obvious limitations. Summary of the invention

Embodiments of the present invention provide a method, a related device, and a system for negotiating a multimedia session, which are used for Solve the problem of existing redundancy that can only be used for single-class media in a session.

 To solve the above technical problem, the embodiment of the present invention provides the following technical solutions:

 A method for negotiating a multimedia session, including:

 The called terminal receives the first session negotiation message from the calling terminal, and the attribute parameter carried in the SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media; the called terminal according to the local session The capability selects an attribute parameter carried in the received SDP packet.

 The called terminal generates a new SDP packet according to the selected attribute parameter.

 The called terminal sends the generated SDP packet to the calling terminal through the second session negotiation message.

 A terminal, comprising:

 a receiving unit, configured to receive a first session negotiation message from the calling terminal, where the attribute parameter carried in the SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media;

 a selecting unit, configured to select, according to a local session capability, an attribute parameter carried in the received SDP packet;

 And a generating unit, configured to generate a new SDP packet according to the attribute parameter selected by the selecting unit, and send, by the sending unit, the SDP packet generated by the generating unit to the calling terminal by using a second session negotiation message.

 A terminal, comprising:

 a sending unit, configured to send a first session negotiation message to the called terminal, where the attribute parameter carried in the SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media;

 a receiving unit, configured to receive a second session negotiation message returned by the called terminal;

 The session processing unit is configured to establish or refresh a session with the called terminal according to the SDP message in the second session negotiation message received by the receiving unit.

 A multimedia session system, including:

 a first terminal and a second terminal;

The first terminal is configured to send a first session negotiation message to the second terminal, where the attribute parameter carried in the session description protocol SDP packet in the first session negotiation message includes media of at least two media. The parameter and the media redundancy parameter; receiving the second session negotiation message returned by the second terminal, and establishing or refreshing the session with the second terminal according to the SDP message in the second session negotiation message.

 The second terminal is configured to receive the first session negotiation message from the first terminal, where the attribute parameter carried in the SDP message in the first session negotiation message includes media redundancy parameters of at least two media; The attribute parameters included in the received SDP message are selected; the new SDP message is generated according to the selected attribute parameter; and the generated SDP message is sent to the first terminal by using the second session negotiation message.

 It can be seen that the technical solution provided by the embodiment of the present invention extends the existing RFC2198 standard, so that the message based on the SDP protocol can simultaneously express the redundancy capability of multiple media, so that the calling terminal and the called terminal The calling terminal can negotiate the redundancy of multiple media at the same time before establishing or updating the session, thereby solving the problem that the existing single-type media can only be redundant in the session.

DRAWINGS

 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

 FIG. 1 is a schematic flowchart of another embodiment of a method for negotiating a multimedia session according to an embodiment of the present invention; FIG. 2 is a schematic flowchart of another embodiment of a method for negotiating a multimedia session according to an embodiment of the present invention; FIG. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention; FIG.

 FIG. 5 is a schematic structural diagram of another terminal according to an embodiment of the present invention;

 FIG. 6 is a schematic structural diagram of a multimedia session system according to an embodiment of the present invention.

Specific embodiment

 Embodiments of the present invention provide a method, a related device, and a system for negotiating a multimedia session.

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. The embodiments are merely a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention. A method for negotiating a multimedia session in the embodiment of the present invention is described below. Referring to FIG. 1, an embodiment of a method for negotiating a multimedia session in the embodiment of the present invention includes:

 101. The called terminal receives a first session negotiation message from the calling terminal.

 When a terminal (ie, the calling terminal) pre-initiates a session with the opposite end (ie, the called terminal) to establish or update a session with the called terminal, the calling terminal sends a first session negotiation message to the called terminal, to The session initialization is triggered, where the first session negotiation message may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein. The calling and receiving terminals may negotiate the new session by carrying an SDP message including a new session parameter (such as a session identifier, a session duration, and an attribute parameter such as a media parameter, a media redundancy parameter, etc.) in the interactive session negotiation message. So that the calling terminal can establish or update the session according to the negotiated session parameters.

 In a practical application, when the calling terminal initiates a session to the called terminal, it may encapsulate the media parameter of the media type corresponding to the pre-transmitted media data (which may include one or more media) in the SDP message. The media parameters include, but are not limited to, a media type indication parameter and a media codec indication parameter. The media codec indication parameter may indicate a media codec supported by the calling terminal, and the calling terminal may carry multiple media codec indications. The parameter is configured to enable the called terminal to learn the media codec supported by the calling terminal when receiving the SDP message sent by the calling terminal. Further, if the calling terminal supports the redundancy capability of the media type, the corresponding media redundancy parameter may also be encapsulated in the SDP packet, and the SDP packet is sent to the called terminal by using the first session negotiation message. .

 In the embodiment of the present invention, the attribute parameter carried in the SDP packet sent by the calling terminal includes the media parameter and the media redundancy parameter of the at least two media, where the media redundancy parameter includes but is not limited to the redundancy type indication parameter, The media codec indication parameter corresponding to the redundant codec. The value of the redundancy type indication parameter and the media codec indication parameter may be a load type (PT, Payload Type) value mapped to various media codecs and redundant codecs.

 102. The called terminal selects an attribute parameter carried in the received SDP packet according to the local session capability.

 When the called terminal receives the SDP message from the calling terminal, it can be based on the local session capability (such as supported media type, supported media codec, supported media type redundancy capability, redundant codec, etc.) The attribute parameters (such as media parameters, media redundancy parameters, etc.) carried in the received SDP packets are selected.

In practical applications, when the called terminal selects media parameters and media redundancy parameters, the called party The terminal may select a corresponding media parameter from the received SDP packet according to the locally supported media type and the media codec capability, such as a media type indication parameter corresponding to the locally supported media type, and corresponding to the locally supported media codec. Media codec indication parameter); according to the local media codec capability and the redundancy capability of the supported media type, select corresponding media redundancy parameters from the received SDP message, such as redundancy type indication parameter and redundancy The codec corresponding to the codec indicates parameters and the like.

 103. The called terminal generates a new SDP packet according to the selected attribute parameter.

 After the called terminal performs the process of step 102, a new SDP packet may be generated according to the selected attribute parameter.

 It can be understood that if the called terminal selects all the attribute parameters carried by the received SDP, the generated SDP message can be identical to the received SDP message.

 104. The called terminal sends the generated SDP packet to the calling terminal by using a second session negotiation message.

 The called terminal sends the generated SDP message to the calling terminal through the second session negotiation message, so that the calling terminal establishes or refreshes the session with the called terminal according to the SDP message returned by the called terminal.

 The foregoing second session negotiation message may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.

 It should be noted that, in the negotiation process of the actual multimedia session, the called terminal may also modify or delete other session parameters except the above attribute parameters in the received SDP message, but the processing is performed. The prior art does not involve the technical solution to be described in the present invention. Therefore, in the embodiment of the present invention, the default called terminal does not need to modify other session parameters in the received SDP message (for example, Description of the technical solution of the present invention by modifying the parameters such as session duration and redundancy levels.

 The technical solution provided by the embodiment of the present invention can be applied to a single-mode session scenario, and can also be applied to a multi-mode session scenario.

It can be seen that the technical solution provided by the embodiment of the present invention extends the existing RFC2198 standard, so that the message based on the SDP protocol can simultaneously express the redundancy capability of multiple media, so that the calling terminal and the called terminal The calling terminal can negotiate the redundancy of multiple media at the same time before establishing or updating the session, thereby solving the problem that the existing single-type media can only be redundant in the session. A method for negotiating a multimedia session in the embodiment of the present invention is described below. Referring to FIG. 2, another embodiment of a method for negotiating a multimedia session in the embodiment of the present invention includes:

 201. The calling terminal sends a first session negotiation message to the called terminal.

 In a practical application, when the calling terminal initiates a session to the called terminal, it may encapsulate the media parameter of the media type corresponding to the pre-transmitted media data (which may include one or more media) in the SDP message. The media parameters include, but are not limited to, a media type indication parameter and a media codec indication parameter. The media codec indication parameter may indicate a media codec supported by the calling terminal, and the calling terminal may carry multiple media codec indications. The parameter is configured to enable the called terminal to learn the media codec supported by the calling terminal when receiving the SDP message sent by the calling terminal. Further, if the calling terminal supports the redundancy capability of the media type, the corresponding media redundancy parameter may also be encapsulated in the SDP packet, and the SDP packet is sent to the called terminal by using the first session negotiation message. .

 In the embodiment of the present invention, the attribute parameter carried in the SDP packet sent by the calling terminal includes the media parameter and the media redundancy parameter of the at least two media, where the media redundancy parameter includes but is not limited to the redundancy type indication parameter, The media codec indication parameter corresponding to the redundant codec. The value of the redundancy type indication parameter and the media codec indication parameter may be a PT value mapped to various media codecs and redundant codecs.

 The foregoing first session negotiation message may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.

 202. The calling terminal receives the second session negotiation message returned by the called terminal, and establishes or refreshes a session with the called terminal according to the SDP message in the second session negotiation message.

 The calling terminal can establish or refresh the SDP message returned by the called terminal, and the calling terminal can simultaneously perform redundancy on the plurality of media transmitted in the established or updated session.

 The foregoing second session negotiation message may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.

It can be seen that the technical solution provided by the embodiment of the present invention extends the existing RFC2198 standard, so that the message based on the SDP protocol can simultaneously express the redundancy capability of multiple media, so that the calling terminal and the called terminal The calling terminal can negotiate the redundancy of multiple media at the same time before establishing or updating the session, thereby solving the problem that the existing single-type media can only be redundant in the session. To facilitate a better understanding of the technical solution of the present invention, a method for negotiating a multimedia session in the embodiment of the present invention is described below with reference to a specific application example.

 It is first assumed that the user equipment (UE, User Equipment) 1 is the session originating end, that is, the calling terminal, and UE2 is the called terminal. Among them, UE1 supports RFC2833 encoded data and voice data, and supports G.711A, G.729 encoded voice data, with redundancy capability of RFC2833 encoded data and redundancy of voice data; UE2 supports voice data, does not support RFC2833 encoding. It only supports G.729 encoded voice data and has the redundancy capability of voice data.

 301. UE1 sends a first session negotiation message to UE2.

 The UE1 encapsulates the pre-negotiated session parameters (including the attribute parameters) in the SDP packet, and sends the message to the UE2 through the first session negotiation message.

 In this embodiment, it is assumed that the SDP packet sent by the UE1 includes the media parameters and media redundancy parameters of the two media of the RFC2833 encoded data and the voice data, and specifically includes the voice type indication parameter; the media codec corresponding to the G.711A Indication parameter (such as PT value 8); media codec indication parameter corresponding to G.729 (such as PT value 18); redundant type indication parameter corresponding to voice data (such as PT value of 96), redundant codec G.711A Corresponding media codec indication parameter (such as PT value 8), media codec indication parameter corresponding to the redundancy codec G.729 (such as PT value 18), and media codec indication parameter corresponding to RFC2833 (such as PT value 97); The redundancy type indication parameter (such as PT value 98) corresponding to the RFC2833 encoded data, and the media codec indication parameter (such as the PT value 97) corresponding to the redundant codec RFC2833.

 302. The UE2 selects an attribute parameter carried in the received SDP packet according to the local session capability.

 When the UE2 receives the first session negotiation message sent by the UE1, the attribute parameter carried in the received SDP message in the first session negotiation message may be selected according to the local session capability.

 In this embodiment, since UE2 only supports G.729 encoded voice data, it does not support RFC2833 encoding, and has the redundancy capability of voice data. Therefore, UE2 selects a voice type indication parameter and a media codec indication parameter corresponding to G.729 (such as PT value 18) from the received SDP message, and then selects a redundancy type indication parameter corresponding to the voice data from the SDP message. (eg PT value is 96), media codec indication parameter of redundant codec G.729 (eg PT value 18).

In the above selection, UE2 does not support RFC2833 encoding, so media parameters related to RFC2833 (media codec indication parameters corresponding to RFC2833) and media redundancy parameters (redundant type indication parameters and redundancy scheme corresponding to RFC2833 encoded data are not selected). Decoding the media codec indication corresponding to RFC2833 In addition, although UE2 supports the redundancy capability of voice data, since it does not support G.711A codec, it does not use G.711 to redundantly encode voice data, so no redundancy is selected. Decoding the media codec indication parameter corresponding to G.711A. It can be understood that, in the technical solution of the present invention, if the UE2 supports the RFC2833 codec data, but does not support the redundancy capability of the RFC2833 data, the UE2 will select the media parameter corresponding to the RFC2833 encoded data, but does not select the media corresponding to the RFC2833 encoded data. Redundant parameters.

 303. The UE2 generates a new SDP message according to the selected attribute parameter.

 After the called terminal performs the process of step 302, a new SDP packet may be generated according to the selected attribute parameter.

 The UE2 sends the generated SDP packet to the UE1 through the second session negotiation message, and the UE1 sends the generated SDP packet to the UE2 through the second session negotiation message, so that the UE1

The UE2 establishes or refreshes a session with the called terminal according to the SDP message returned by the UE1.

 305. The UE1 establishes or refreshes a session with the UE2 according to the SDP packet in the second session negotiation message returned by the UE2.

 UE2 may establish or refresh a session with the called terminal according to the SDP message returned by UE1. In the embodiment of the present invention, when the UE1 receives the SDP packet returned by the UE2, it can be learned that the UE2 supports the G.729-encoded voice data and the G.729-encoded voice data redundancy, and the UE2 can transmit in the session to be established. G.729 encoded speech data, and the speech data is redundant using G.729 encoding.

 It can be understood that if the UE2 supports the redundancy capability of the RFC2833 encoded data and the RFC2833 data, the UE1 can transmit the G.729 encoded voice data and the RFC2833 encoded data in the session to be established, and simultaneously perform redundancy on the two data. .

 The foregoing first session negotiation message and the second conference negotiation message may be SIP protocol messages, or may be other end-to-end peer-to-peer protocol messages based on the SDP protocol, which is not limited herein.

 It should be noted that, in the actual multimedia session negotiation process, the foregoing UE1 may also modify or delete other session parameters except the above attribute parameters in the received SDP message, but the processing belongs to The prior art does not involve the technical solution to be clarified by the present invention. Therefore, in the embodiment of the present invention, in the case that the default UE1 does not need to modify other session parameters in the received SDP packet (such as session duration, Description of the technical solution of the present invention by modifying the parameters such as redundant series.

It can be seen from the above that the technical solution provided by the embodiment of the present invention expands the existing RFC2198 standard. The SDP-based message can simultaneously express the redundancy capabilities of multiple media, so that the calling terminal and the called terminal can simultaneously negotiate the redundancy capabilities of multiple media before establishing or updating the session. In addition, the existing problem of redundancy for a single type of media in a session can be solved. A terminal for implementing the foregoing method for negotiating a multimedia session in the embodiment of the present invention is described. Referring to FIG. 4, a terminal provided by the embodiment of the present invention includes:

 The receiving unit 401 is configured to receive a first session negotiation message from the calling terminal.

 The attribute parameter carried in the SDP packet in the first session negotiation message includes media parameters and media redundancy parameters of at least two media.

 The selecting unit 402 is configured to select, according to the local session capability, the attribute parameter carried in the received SDP packet;

 When the receiving unit 401 receives the SDP message from the autonomous calling terminal, the selecting unit 402 can be triggered according to the local session capability (such as supported media type, supported media codec, supported media type redundancy capability and redundancy). Codec, etc.) selects attribute parameters (such as media parameters, media redundancy parameters, etc.) carried in the received SDP packets.

 In an actual application, when the terminal selects the media parameter and the media redundancy parameter, the selecting unit 402 may select a corresponding SDP packet from the received SDP packet according to the locally supported media type and the media encoding and decoding capability. Media parameters (such as media type indication parameters corresponding to locally supported media types, media codec indication parameters corresponding to local media codec capabilities); according to local media codec capabilities and redundant capabilities of supported media types, Corresponding media redundancy parameters, such as a redundancy type indication parameter and a media codec indication parameter corresponding to the redundancy codec, are selected in the received SDP message.

 The foregoing first session negotiation may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.

 The generating unit 403 is configured to generate a new SDP message according to the attribute parameter selected by the selecting unit 402.

 The sending unit 404 is configured to send, by using the second session negotiation message, the SDP^ message generated by the generating unit 403 to the calling terminal.

The foregoing second conference negotiation message may be a SIP protocol message, or may be another end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein. It should be noted that the terminal in this embodiment may be used as the called terminal in the foregoing method embodiment, and may be used to implement all the technical solutions in the foregoing method embodiments, and the functions of the respective functional modules may be in accordance with the foregoing method embodiments. The specific implementation of the method may be referred to the related description in the foregoing embodiments, and details are not described herein again. The following is a description of another terminal in the embodiment of the present invention for implementing the foregoing method for negotiating a multimedia session. Referring to FIG. 5, a terminal provided by the embodiment of the present invention includes:

 The sending unit 501 is configured to send a session initiation protocol first session negotiation message to the called terminal, where the attribute parameter carried in the session description protocol SDP message in the first session negotiation message includes media parameters and media of at least two media. The media parameter includes, but is not limited to, a media type indication parameter and a media codec indication parameter. The media redundancy parameter includes, but is not limited to, a redundancy type indication parameter, and a media codec indication parameter corresponding to the redundancy codec. The value of the redundancy type indication parameter and the media codec indication parameter may be a PT value mapped to various media codecs and redundant codecs.

 The receiving unit 502 is configured to receive the second session negotiation message returned by the called terminal, and the session processing unit 503 is configured to establish or refresh the SDP message according to the second session negotiation message received by the receiving unit 502. a session called a terminal;

 The foregoing first session negotiation message and the second conference negotiation message may be SIP protocol messages, or may be other end-to-end peer-to-peer protocol messages based on the SDP protocol, which is not limited herein.

 The session processing unit 503 can establish or refresh a session with the called terminal according to the SDP message returned by the called terminal. If the SDP message returned by the called terminal still includes media redundancy parameters of two or more media, the foregoing The terminal can simultaneously perform redundancy on the plurality of media transmitted in the session established or updated by the session processing unit 503.

 It should be noted that the terminal in this embodiment may be used as the calling terminal in the foregoing method embodiment, and may be used to implement all the technical solutions in the foregoing method embodiments, and the functions of the various functional modules may be in accordance with the foregoing method embodiments. The specific implementation of the method may be referred to the related description in the foregoing embodiments, and details are not described herein again.

It can be seen that the technical solution provided by the embodiment of the present invention extends the existing RFC2198 standard, so that the message based on the SDP protocol can simultaneously express the redundancy capability of multiple media, so that the calling terminal and the called terminal Calling a terminal to simultaneously perform redundancy on multiple media before establishing or updating a session Negotiation, which in turn solves the problem of existing redundancy in a single type of media that can only be used in a session. The multimedia session system in the embodiment of the present invention is described below. Referring to FIG. 6, the multimedia session system in the embodiment of the present invention includes:

 a first terminal 601 and a second terminal 602;

 The first terminal 601 is configured to send a first session negotiation message to the second terminal 602, where the attribute parameter carried in the SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media. The second session negotiation message returned by the second terminal 602 is received, and the session with the second terminal 602 is established or refreshed according to the received SDP message in the second session negotiation message.

 In a practical application, when the first terminal 601 initiates a session to the second terminal 602, it may encapsulate the media parameter of the media type corresponding to the pre-transmitted media data (which may include one or more media) in the SDP message. . The media parameters include, but are not limited to, a media type indication parameter and a media codec indication parameter. The media codec indication parameter may indicate a media codec supported by the first terminal 601, and the first terminal 601 may carry multiple media. Decoding the indication parameter, so that the second terminal 602 learns the media codec supported by the first terminal 601 when receiving the SDP message sent by the first terminal 601. Further, if the first terminal 601 supports the media type The SDP packet is also encapsulated in the SDP packet, and the SDP packet is sent to the second terminal 602 by using the first session negotiation message.

 The second terminal 602 is configured to receive the first session negotiation message from the first terminal 601, where the attribute parameter carried in the SDP message in the first session negotiation message includes media redundancy parameters of at least two media; The session capability selects the attribute parameter carried in the received SDP message; generates a new SDP message according to the selected attribute parameter; and sends the generated SDP message to the first terminal 601 by using the second session negotiation message. In a practical application, when the second terminal 602 selects the media parameter and the media redundancy parameter, the second terminal 602 may select a corresponding SDP packet from the received SDP packet according to the locally supported media type and the media encoding and decoding capability. Media parameters (such as media type indication parameters corresponding to locally supported media types, media codec indication parameters corresponding to local media codec capabilities); according to local media codec capabilities and redundant capabilities of supported media types, Corresponding media redundancy parameters, such as a redundancy type indication parameter and a media codec indication parameter corresponding to the redundancy codec, are selected in the received SDP message.

The foregoing first session negotiation message and the second conference negotiation message may be SIP protocol messages, or It may be an end-to-end peer-to-peer protocol message based on the SDP protocol, which is not limited herein.

 It should be noted that the first terminal 601 in this embodiment may be the calling terminal in the foregoing method embodiment, and the second terminal 602 in this embodiment may be the called terminal in the foregoing method embodiment, which may be used for All the technical solutions in the foregoing method embodiments are implemented, and the functions of the respective functional modules may be implemented according to the method in the foregoing method embodiments. For the specific implementation process, refer to the related description in the foregoing embodiments, and details are not described herein again.

 It can be seen that the technical solution provided by the embodiment of the present invention extends the existing RFC2198 standard, so that the message based on the SDP protocol can simultaneously express the redundancy capability of multiple media, so that the calling terminal and the called terminal The calling terminal can negotiate the redundancy of multiple media at the same time before establishing or updating the session, thereby solving the problem that the existing single-type media can only be redundant in the session.

 A person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium, the above mentioned storage. The medium can be a read only memory, a random access memory, a magnetic or optical disk, and the like.

 The method for negotiating the multimedia session provided by the present invention, the related device and the system are described in detail. For those skilled in the art, the idea of the embodiment of the present invention may be changed in the specific implementation manner and the application scope. In conclusion, the contents of this specification are not to be construed as limiting the invention.

Claims

Claim A method for negotiating a multimedia session, comprising:  The called terminal receives the first session negotiation message from the calling terminal, and the attribute parameter carried in the session description protocol SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media.  The called terminal selects an attribute parameter carried in the received SDP packet according to the local session capability;  The called terminal generates a new SDP packet according to the selected attribute parameter;  The called terminal sends the generated SDP message to the calling terminal by using a second session negotiation message.  2. The method of claim 1 wherein  The called terminal selects the attribute parameter carried in the received SDP packet according to the local session capability, which is specifically:  The called terminal selects a corresponding media parameter from the received SDP packet according to the locally supported media type and the media codec capability, where the media parameter includes a media type indication parameter and a media codec indication parameter;  The called terminal selects a corresponding media redundancy parameter from the received SDP message according to the local media codec capability and the redundancy capability of the supported media type, where the media redundancy parameter includes a redundancy type indication parameter. The media codec indication parameter corresponding to the redundant codec.  3. The method of claim 2, wherein  The value of the media codec indication parameter is specifically a payload type PT value corresponding to the media codec;  And/or, the value of the redundancy type indication parameter is specifically a load type PT value corresponding to the redundancy type.  4. A method according to any one of claims 1 to 3, characterized in that  The first session negotiation message is specifically a session initiation protocol SIP message or an end-to-end peer-to-peer protocol message based on the SDP protocol; The second session negotiation message is specifically a session initiation protocol SIP message or an end-to-end peer-to-peer protocol message based on the SDP protocol. 5. A terminal, comprising:  a receiving unit, configured to receive a first session negotiation message from the calling terminal, where the attribute parameter carried in the session description protocol SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media;  a selecting unit, configured to select, according to a local session capability, an attribute parameter carried in the received SDP packet;  a generating unit, configured to generate a new SDP packet according to the attribute parameter selected by the selecting unit, and send, by the sending unit, the SDP packet generated by the generating unit to the calling terminal by using a second session negotiation message .  6. The terminal of claim 5, wherein:  The selecting unit is specifically configured to: select, according to the locally supported media type and the media encoding and decoding capability, the corresponding media parameter from the received SDP packet, where the media parameter includes a media type indication parameter and a media codec indication And selecting a corresponding media redundancy parameter from the received SDP message according to the local media codec capability and the redundancy capability of the supported media type, where the media redundancy parameter includes a redundancy type indication parameter and The media codec indication parameter corresponding to the redundant codec.  7. A terminal, comprising:  a sending unit, configured to send a first session negotiation message to the called terminal, where the attribute parameter carried in the SDP message in the first session negotiation message includes media parameters and media redundancy parameters of at least two media;  a receiving unit, configured to receive a second session negotiation message returned by the called terminal;  The session processing unit is configured to establish or refresh a session with the called terminal according to the SDP message in the second session negotiation message received by the receiving unit.  The terminal according to claim 7, wherein the session processing unit is further configured to: when the second session negotiation message carries media redundancy parameters of two or more media, in the establishing or Multiple media transmitted in the updated session are redundant.  9. A multimedia session system, comprising:  a first terminal and a second terminal; The first terminal is configured to send a first session negotiation message to the second terminal, where the attribute parameter carried in the session description protocol SDP message in the first session negotiation message includes media parameters and media redundancy of at least two media. Retrieving the second session negotiation message returned by the second terminal, and according to the The SDP message in the second session negotiation message is used to establish or refresh the session with the second terminal; the second terminal is configured to receive a first session negotiation message from the first terminal, where the first session is negotiated. The attribute parameter carried in the SDP packet in the message includes the media redundancy parameter of the at least two media; the attribute parameter included in the received SDP message is selected according to the local session capability; and the new attribute parameter is generated according to the selected attribute parameter. The SDP message is sent to the first terminal by using the second session negotiation message.  10. The system of claim 9 wherein:  The first terminal is further configured to: when the second session negotiation message carries media redundancy parameters of two or more media, perform redundancy on multiple media transmitted in the established or updated session.