CN105791739A - Video session negotiation method and apparatus - Google Patents
Video session negotiation method and apparatus Download PDFInfo
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- CN105791739A CN105791739A CN201410816125.1A CN201410816125A CN105791739A CN 105791739 A CN105791739 A CN 105791739A CN 201410816125 A CN201410816125 A CN 201410816125A CN 105791739 A CN105791739 A CN 105791739A
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Abstract
Embodiments of the present invention disclose a video session negotiation method and apparatus. The method comprises the steps that before initiating a video session, a user terminal sends a media negotiation request to a video session platform, wherein the media negotiation request carries information on a forward error correction (FEC) type supported by the user terminal; the user terminal receives a media negotiation response sent by the video session platform, wherein the media negotiation response carries information on an FEC type supported by the video session platform; and the user terminal determines information of an FEC type of the current video session according to the information on the FEC type supported by the video session platform, and sends the determined information of the FEC type to the video session platform.
Description
Technical field
The present invention relates to video session transmission technology, particularly relate to the video session machinery of consultation in the transmission of a kind of video session and device.
Background technology
The reliability of transmission of video, low error rate are required very high by video conference, not so there will be video card pause, time delay, unintelligible, even the phenomenon such as interruption, affects users conference efficiency, brings inconvenience.For this, propose a lot of error correcting technique for video frequency transmission optimizing, consider from data link layer, have two kinds of modes processing mistake: HARQ (ARQ, and forward error correction (FEC, ForwardErrorCorrection) AutomaticRepeat-reQuest).Wherein, FEC is that the certain redundant correcting code of data affix that sender will send sends in the lump, and data are carried out error detection according to error correcting code by recipient, as found mistake, recipient are calculated correcting.And for FEC block code, coding during chnnel coding, can also be interleaved, the dependency between code word bits can be upset, the burst error in groups in transmitting procedure in channel is converted to random error, thus improving the reliability of whole communication system.
Coding and corresponding decoding two parts are included, so different FEC coded systems cannot intercommunication due to different FEC coded systems.The terminal of such as system A use when sending data in institute's RS coded system, and the server of system B uses Turbo code encoding/decoding mode, then cannot resolve when data arrive the server of system B.There is no the solution for this technical problem at present can be for reference.
Summary of the invention
The embodiment of the present invention is for solving above-mentioned technical problem, it is provided that a kind of video session machinery of consultation and device, can carry out transmission of video across video session platform.
The technical scheme of the embodiment of the present invention is achieved in that
A kind of video session machinery of consultation, including:
User terminal, before initiating video session, sends media negotiation request to video session platform, carries the information of the FEC type that described user terminal is supported in the request of described media negotiation；
Described user terminal receives the media negotiation response that described video session platform sends, and carries the information of the FEC type that described video session platform is supported in the response of described media negotiation；
Described user terminal determines the information of the FEC type of current video session according to the information of the FEC type of described video session platform support, and the information of determined FEC type is sent to described video session platform.
Preferably, including at least the information of block code and/or convolutional code in the information of described FEC type；
Described block code comprises following one: inner institute (RS) code, BCH code, Hamming code；
Described convolutional code comprises following one: systematic convolutional code, concatenated coding.
Preferably, the request of described media negotiation also carries the title of described video session and the information of purpose, the information of activity time, the medium kind of described video session and control information.
Preferably, the video session system belonging to described video session platform is different from the video session system belonging to described user terminal.
A kind of video session machinery of consultation, is applied in video session platform, and described method includes:
After receiving the first media negotiation request that user terminal sends, send the first media negotiation response to described user terminal；Wherein, described first media negotiation request carries the information of the forward error correction FEC type that described user terminal is supported；Described first media negotiation response carries the information of the FEC type that described video session platform is supported；
Receive the second media negotiation request that described user terminal sends, from described second media negotiation request, parse the information of the FEC type that described user terminal is determined, and send the second media negotiation response to described user terminal.
Preferably, the video session system belonging to described video session platform is different from the video session system belonging to described user terminal.
A kind of video session consulting device, including: the first transmitting element, receives unit, determines unit and the second transmitting element, wherein:
First transmitting element, for, before initiating video session, sending media negotiation request to video session platform, carry the information of the forward error correction FEC type that described user terminal is supported in the request of described media negotiation；
Receive unit, for receiving the media negotiation response that described video session platform sends, the response of described media negotiation carries the information of the FEC type that described video session platform is supported；
Determine unit, for determining the information of the FEC type of current video session according to the information of the FEC type of described video session platform support；
Second transmitting element, for sending the information of determined FEC type to described video session platform.
Preferably, including at least the information of block code and/or convolutional code in the information of described FEC type；
Described block code comprises following one: inner institute code RS, BCH code, Hamming code；
Described convolutional code comprises following one: systematic convolutional code, concatenated coding.
Preferably, the request of described media negotiation also carries the title of described video session and the information of purpose, the information of activity time, the medium kind of described video session and control information.
Preferably, the video session system belonging to described video session platform is different from the video session system belonging to described device.
A kind of video session consulting device, is applied in video session platform, and described device includes: first receives unit, the first transmitting element, the second reception unit, resolution unit and the second transmitting element, wherein:
First receives unit, for receiving the first media negotiation request that user terminal sends, and triggers described first transmitting element；Wherein, described first media negotiation request carries the information of the forward error correction FEC type that described user terminal is supported；
First transmitting element, for sending the first media negotiation response to described user terminal；Wherein, described first media negotiation response carries the information of the FEC type that described video session platform is supported；
Second receives unit, for receiving the second media negotiation request that described user terminal sends；
Resolution unit, for parsing the information of the FEC type that described user terminal is determined from described second media negotiation request；
Second transmitting element, for sending the second media negotiation response to described user terminal.
Preferably, the video session system belonging to described video session platform is different from the video session system belonging to described user terminal.
In the embodiment of the present invention, when user terminal is initiated before video session, media negotiation request need to be sent to video session platform, inform the information of the FEC type that video session platform user terminal supports, the information informing user terminal of the FEC type that self is also supported by video session platform, the information of the FEC type that user terminal adopts according to the information selection current video session of the FEC type of video session platform support, and the information of selected FEC type is notified video session platform, so, user terminal is when current video session is encoded by the FEC passing through to choose, video session platform can decode that this video session, thus ensure that the normal transmission of video session, realize the video session across video session platform to transmit.The technical scheme of the embodiment of the present invention ensure that the video session across video session platform is transmitted, it is ensured that the reliability of video session transmission, improves Consumer's Experience.
Accompanying drawing explanation
Fig. 1 is the flow chart of the video session machinery of consultation of the embodiment of the present invention one；
Fig. 2 is the flow chart of the video session machinery of consultation of the embodiment of the present invention two；
Fig. 3 is the flow chart of the video session machinery of consultation of the embodiment of the present invention three；
Fig. 4 is the composition structural representation of the video session consulting device of the embodiment of the present invention one；
Fig. 5 is the composition structural representation of the video session consulting device of the embodiment of the present invention two.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, by the following examples also with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is the flow chart of the video session machinery of consultation of the embodiment of the present invention one, as it is shown in figure 1, the video session machinery of consultation of the embodiment of the present invention one comprises the following steps:
Step 101, user terminal, before initiating video session, sends media negotiation request to video session platform.
In the embodiment of the present invention, the request of described media negotiation carries the information of the FEC type that described user terminal is supported.Here, the information spinner of FEC type to include the information of block code and/or convolutional code；
Described block code comprises following one: inner institute RS code, BCH code, Hamming code etc.；
Described convolutional code comprises following one: systematic convolutional code, concatenated coding etc..
In the embodiment of the present invention, when user terminal realizes when the video session of video session platform, the relevant information of the FEC first self adopted is sent to video session platform, in order to the correlative coding information of the FEC that the video session platform that reception video session platform sends is supported.
Above-mentioned media negotiation request also carries the title of described video session and the information of purpose, the information of activity time, the medium kind of described video session and control information etc..
Step 102, user terminal receives the media negotiation response that described video session platform sends.
In the embodiment of the present invention, the response of described media negotiation carries the information of the FEC type that described video session platform is supported.
Step 103, user terminal determines the information of the FEC type of current video session according to the information of the FEC type of described video session platform support, and the information of determined FEC type is sent to described video session platform.
In the embodiment of the present invention, after user terminal receives the information of the FEC type that video session platform is supported, determine the coded system of, so that this coded system all supported by user terminal and video session platform, during to carry out video session transmission between the two parties, all select determined coded system, so that user terminal resolves video session with video session platform phase mutual energy, it is achieved the smooth transmission of video session.
In the embodiment of the present invention, the video session system belonging to video session platform is different from the video session system belonging to described user terminal.
Fig. 2 is the flow chart of the video session machinery of consultation of the embodiment of the present invention two, as in figure 2 it is shown, the video session machinery of consultation of the embodiment of the present invention two comprises the following steps:
Step 201, after receiving the first media negotiation request that user terminal sends, sends the first media negotiation response to described user terminal；
Wherein, described first media negotiation request carries the information of the forward error correction FEC type that described user terminal is supported；Described first media negotiation response carries the information of the FEC type that described video session platform is supported；Here, the information spinner of FEC type to include the information of block code and/or convolutional code；
Described block code comprises following one: inner institute RS code, BCH code, Hamming code etc.；
Described convolutional code comprises following one: systematic convolutional code, concatenated coding etc..
In the embodiment of the present invention, when user terminal realizes when the video session of video session platform, the relevant information of the FEC first self adopted is sent to video session platform, in order to the correlative coding information of the FEC that the video session platform that reception video session platform sends is supported.
Above-mentioned media negotiation request also carries the title of described video session and the information of purpose, the information of activity time, the medium kind of described video session and control information etc..
In the embodiment of the present invention, after user terminal receives the information of the FEC type that video session platform is supported, determine the coded system of, so that this coded system all supported by user terminal and video session platform, during to carry out video session transmission between the two parties, all select determined coded system, so that user terminal resolves video session with video session platform phase mutual energy, it is achieved the smooth transmission of video session.
In the embodiment of the present invention, the video session system belonging to video session platform is different from the video session system belonging to described user terminal.
Step 202, receives the second media negotiation request that described user terminal sends, and parses the information of the FEC type that described user terminal is determined, and send the second media negotiation response to described user terminal from described second media negotiation request.
After video session platform receives the second media negotiation request that user terminal sends, determine the coded system of FEC selected by user terminal, when carrying out video session transmission with this user terminal, to use the coded system of the FEC consulted with user terminal that video session data are carried out encoding and decoding.
Below by way of concrete example, it is further elucidated with the essence of the technical scheme of the embodiment of the present invention.
The embodiment of the present invention is to pass on about the medium stream information in Multimedia session so that the recipient of certain conversation description can participate in this session.These information that must pass on include: session name and purpose, session activation time, form the medium kind of this session and receive the control information of these media.
The simplification form of medium stream information can be expressed as:
<type>=<value>
One conversation description is described to describe with several media-level by a session level and forms, and session level part starts with " v=", and media description is to start with " m=" row, optional with No. * behavior represented.
Conversation description includes following information:
V=(version of agreement)
O=(name of session identifier or conversation establishing person)
S=(session name)
I=* (session information)
U=* (URI of conversation description)
E=* (e-mail address)
P=* (telephone number)
C=* (link information)
B=* (bandwidth information)
Z=* (time zone of session adjusts)
K=* (password of encryption)
A=* (session attribute)
Time describes:
T=(session activation time)
R=* (session repetition time)
Media description includes following information:
M=(name of media and transmission address)
I=* (media streams)
C=* (link information)
B=* (bandwidth information)
K=* (password of encryption)
A=* (medium property)
In the embodiment of the present invention, in addition it is also necessary to increase the row about forward error correction FEC type information in media description:
F=<fec><typelist><totalbits, databits>
Wherein<fec>is the type of forward error correction FEC, and type is blockcode (block code), convolutionalcode (convolutional code)；<typelist>is the specific coding mode in different FEC type, and such as block code has RS, BCH, Hammingcode etc., convolutional code to have systematic convolutional code, concatenated coding Turbo etc.；<totalbits, databits>is the description to total bit and data bits of the RS code.If coded system has RS code, media description also should increase the row about interleaved coded information:
X=<RScodenumber, totalbits>
Wherein<RScodenumber, totalbits>is the matrix of " RS yardage " × " total bit of each RS code ".
So, the terminal of different system and video session platform, when carrying out video conference, will carry out a media negotiation for the type of FEC.With SIPuserA GC group connector A, it is example that ServerB represents video conference video session platform, SIPuserA just can include SDP in its offer and be described for its FEC type supported, it is assumed that comprise a bidirectional flow of video (using encoding and decoding H.261 (load type 31)) and FEC type (RS, BCH and Turbo):
V=0
O=A28908445262890844526INIP4host.anywhere.com
S=hust
C=INIP4host.anywhere.com
T=00
M=video51372RTP/AVP31
A=rtpmap:31H261/90000
F=blockcodeRS204188
X=8204
F=blockcodeBCH
F=convolutionalcodeTurbo
F=inactive
SIPuserA is sent to the initial offer of video session platform ServerB and indicates the supported FEC type of video flowing, and the FEC type that ServerB can support is BCH and Turbo, so it sends following answer:
V=0
O=A28908445262890844526INIP4host.anywhere.com
S=hust
C=INIP4host.anywhere.com
T=00
M=video51372RTP/AVP31
A=rtpmap:31H261/90000
F=blockcodeBCH
F=convolutionalcodeTurbo
F=inactive
SIPuserA can select any one in the two FEC type.So it sends the offer updated, video flowing direction is transmitting-receiving:
V=0
O=A28908445262890844526INIP4host.anywhere.com
S=hust
C=INIP4host.anywhere.com
T=00
M=video51372RTP/AVP31
A=rtpmap:31H261/90000
F=blockcodeBCH
F=sendrecv
Video session platform ServerB receives this FEC type:
V=0
O=A28908445262890844526INIP4host.anywhere.com
S=hust
C=INIP4host.anywhere.com
T=00
M=video51372RTP/AVP31
A=rtpmap:31H261/90000
F=blockcodeBCH
F=sendrecv
If video session platform ServerB can only support in N number of FEC type, it is by this FEC type of selection and is included in answer.Now SIPuserA activates, by resending INVITE method, the video flowing using this FEC type.So far, media negotiation terminates.
Fig. 3 is the flow chart of the video session machinery of consultation of the embodiment of the present invention three, as it is shown on figure 3, the video session machinery of consultation of the embodiment of the present invention comprises the following steps:
Step 301, userA sends SDPoffer message to ServerB.First time SDPoffer is that SIPuserA sends the FEC type and specifying information self supported to ServerB.
Step 302, ServerB sends SDPanswer message to userA.First time SDPanswer is that ServerB sends the answer of self support FEC type to SIPuserA.
Step 303, userA sends SDPoffer message to ServerB again.Second time SDPoffer is in two the FEC types that userA and userB can be selected to support after SIPuserA obtains first answer, sends offer to ServerB so updating.
Step 304, ServerB sends SDPanswer message to userA again.Second time SDPanswer is that ServerB accepts this FEC type.
Fig. 4 is the composition structural representation of the video session consulting device of the embodiment of the present invention one, as shown in Figure 4, the video session consulting device of the embodiment of the present invention includes: the first transmitting element 40, receive unit 41, determine unit 42 and the second transmitting element 43, wherein:
First transmitting element 40, for, before initiating video session, sending media negotiation request to video session platform, carry the information of the forward error correction FEC type that described user terminal is supported in the request of described media negotiation；
Receive unit 41, for receiving the media negotiation response that described video session platform sends, the response of described media negotiation carries the information of the FEC type that described video session platform is supported；
Determine unit 42, for determining the information of the FEC type of current video session according to the information of the FEC type of described video session platform support；
Second transmitting element 43, for sending the information of determined FEC type to described video session platform.
In the embodiment of the present invention, including at least the information of block code and/or convolutional code in the information of described FEC type；
Described block code comprises following one: inner institute code RS, BCH code, Hamming code；
Described convolutional code comprises following one: systematic convolutional code, concatenated coding.
In the embodiment of the present invention, the request of described media negotiation also carries the title of described video session and the information of purpose, the information of activity time, the medium kind of described video session and control information.
In the embodiment of the present invention, the video session system belonging to described video session platform is different from the video session system belonging to the video session consulting device of the embodiment of the present invention.
The video session consulting device of the embodiment of the present invention, is particularly suited for subscriber terminal side.
It will be appreciated by those skilled in the art that the function that realizes of each processing unit in the video session consulting device shown in Fig. 4 can refer to the associated description of aforementioned video session negotiation method and embodiment and understands.It will be appreciated by those skilled in the art that the function of each processing unit in the video session consulting device shown in Fig. 4 can be realized by the program that runs on processor, it is possible to realized by concrete logic circuit.
Fig. 5 is the composition structural representation of the video session consulting device of the embodiment of the present invention two, as shown in Figure 5, the video session consulting device of the embodiment of the present invention is applied in video session platform, described video session consulting device includes: first receives unit the 50, first transmitting element 51, second receives unit 52, resolution unit 53 and the second transmitting element 54, wherein:
First receives unit 50, for receiving the first media negotiation request that user terminal sends, and triggers described first transmitting element 51；Wherein, described first media negotiation request carries the information of the forward error correction FEC type that described user terminal is supported；Here, the information spinner of FEC type to include the information of block code and/or convolutional code；
Described block code comprises following one: inner institute RS code, BCH code, Hamming code etc.；
Described convolutional code comprises following one: systematic convolutional code, concatenated coding etc..
In the embodiment of the present invention, when user terminal realizes when the video session of video session platform, the relevant information of the FEC first self adopted is sent to video session platform, in order to the correlative coding information of the FEC that the video session platform that reception video session platform sends is supported.
Above-mentioned first media negotiation request also carries the title of described video session and the information of purpose, the information of activity time, the medium kind of described video session and control information etc..
First transmitting element 52, for sending the first media negotiation response to described user terminal；Wherein, described first media negotiation response carries the information of the FEC type that described video session platform is supported；
Second receives unit 53, for receiving the second media negotiation request that described user terminal sends；
Resolution unit 54, for parsing the information of the FEC type that described user terminal is determined from described second media negotiation request；
Second transmitting element 55, for sending the second media negotiation response to described user terminal.
In the embodiment of the present invention, the video session system belonging to described video session platform is different from the video session system belonging to described user terminal.
The video session consulting device of the embodiment of the present invention, is particularly suited for video session platform side.
It will be appreciated by those skilled in the art that the function that realizes of each processing unit in the video session consulting device shown in Fig. 5 can refer to the associated description of aforementioned video session negotiation method and embodiment and understands.It will be appreciated by those skilled in the art that the function of each processing unit in the video session consulting device shown in Fig. 5 can be realized by the program that runs on processor, it is possible to realized by concrete logic circuit.
Between technical scheme described in the embodiment of the present invention, when not conflicting, it is possible to combination in any.
In several embodiments provided by the present invention, it should be understood that disclosed method, device and electronic equipment, it is possible to realize by another way.Apparatus embodiments described above is merely schematic, such as, the division of described unit, it is only a kind of logic function to divide, actual can have other dividing mode when realizing, and as: multiple unit or assembly can be in conjunction with, or is desirably integrated into another system, or some features can ignore, or do not perform.It addition, the coupling each other of shown or discussed each ingredient or direct-coupling or communication connection can be through INDIRECT COUPLING or the communication connection of some interfaces, equipment or unit, it is possible to be electrical, machinery or other form.
The above-mentioned unit illustrated as separating component can be or may not be physically separate, and the parts shown as unit can be or may not be physical location, namely may be located at a place, it is also possible to be distributed on multiple NE；Part or all of unit therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.
It addition, each functional unit in various embodiments of the present invention can be fully integrated in a processing unit, it is also possible to be that each unit is individually as a unit, it is also possible to two or more unit are integrated in a unit；Above-mentioned integrated unit both can adopt the form of hardware to realize, it would however also be possible to employ hardware adds the form of application function unit and realizes.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can be completed by the hardware that programmed instruction is relevant, aforesaid program can be stored in a computer read/write memory medium, this program upon execution, performs to include the step of said method embodiment；And aforesaid storage medium includes: movable storage device, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), magnetic disc or CD.
Or, if the above-mentioned integrated unit of the embodiment of the present invention realizes using the form of applied function module and as independent production marketing or when using, it is also possible to be stored in a computer read/write memory medium.Based on such understanding, the part that prior art is contributed by the technical scheme of the embodiment of the present invention substantially in other words can embody with the form of application product, these computer application products are stored in a storage medium, including some instructions with so that a computer equipment (can be personal computer, server or the network equipment etc.) performs all or part of of method described in each embodiment of the present invention.And aforesaid storage medium includes: movable storage device, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), magnetic disc or CD.
Protection scope of the present invention is not limited thereto, and those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should be encompassed within protection scope of the present invention.
Claims (12)
1. a video session machinery of consultation, it is characterised in that described method includes:
User terminal, before initiating video session, sends media negotiation request to video session platform, carries the information of the forward error correction FEC type that described user terminal is supported in the request of described media negotiation；
Described user terminal receives the media negotiation response that described video session platform sends, and carries the information of the FEC type that described video session platform is supported in the response of described media negotiation；
Described user terminal determines the information of the FEC type of current video session according to the information of the FEC type of described video session platform support, and the information of determined FEC type is sent to described video session platform.
2. method according to claim 1, it is characterised in that including at least the information of block code and/or convolutional code in the information of described FEC type；
Described block code comprises following one: inner institute RS code, BCH code, Hamming code；
Described convolutional code comprises following one: systematic convolutional code, concatenated coding.
3. method according to claim 1 and 2, it is characterised in that also carry the title of described video session and the information of purpose, the information of activity time, the medium kind of described video session and control information in the request of described media negotiation.
4. method according to claim 1, it is characterised in that the video session system belonging to described video session platform is different from the video session system belonging to described user terminal.
5. a video session machinery of consultation, is applied in video session platform, it is characterised in that described method includes:
After receiving the first media negotiation request that user terminal sends, send the first media negotiation response to described user terminal；Wherein, described first media negotiation request carries the information of the forward error correction FEC type that described user terminal is supported；Described first media negotiation response carries the information of the FEC type that described video session platform is supported；
Receive the second media negotiation request that described user terminal sends, from described second media negotiation request, parse the information of the FEC type that described user terminal is determined, and send the second media negotiation response to described user terminal.
6. method according to claim 5, it is characterised in that the video session system belonging to described video session platform is different from the video session system belonging to described user terminal.
7. a video session consulting device, it is characterised in that described device includes: the first transmitting element, receive unit, determine unit and the second transmitting element, wherein:
First transmitting element, for, before initiating video session, sending media negotiation request to video session platform, carry the information of the forward error correction FEC type that described user terminal is supported in the request of described media negotiation；
Receive unit, for receiving the media negotiation response that described video session platform sends, the response of described media negotiation carries the information of the FEC type that described video session platform is supported；
Determine unit, for determining the information of the FEC type of current video session according to the information of the FEC type of described video session platform support；
Second transmitting element, for sending the information of determined FEC type to described video session platform.
8. device according to claim 7, it is characterised in that including at least the information of block code and/or convolutional code in the information of described FEC type；
Described block code comprises following one: inner institute RS code, BCH code, Hamming code；
Described convolutional code comprises following one: systematic convolutional code, concatenated coding.
9. the device according to claim 7 or 8, it is characterised in that also carry the title of described video session and the information of purpose, the information of activity time, the medium kind of described video session and control information in the request of described media negotiation.
10. device according to claim 7, it is characterised in that the video session system belonging to described video session platform is different from the video session system belonging to described device.
11. a video session consulting device, it is applied in video session platform, it is characterised in that described device includes: first receives unit, the first transmitting element, the second reception unit, resolution unit and the second transmitting element, wherein:
First receives unit, for receiving the first media negotiation request that user terminal sends, and triggers described first transmitting element；Wherein, described first media negotiation request carries the information of the forward error correction FEC type that described user terminal is supported；
First transmitting element, for sending the first media negotiation response to described user terminal；Wherein, described first media negotiation response carries the information of the FEC type that described video session platform is supported；
Second receives unit, for receiving the second media negotiation request that described user terminal sends；
Resolution unit, for parsing the information of the FEC type that described user terminal is determined from described second media negotiation request；
Second transmitting element, for sending the second media negotiation response to described user terminal.
12. device according to claim 11, it is characterised in that the video session system belonging to described video session platform is different from the video session system belonging to described user terminal.
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| CN110876119A (en) * | 2018-09-04 | 2020-03-10 | 成都鼎桥通信技术有限公司 | Method and equipment for negotiating terminal multicast processing capability |
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