CN103139217A - Multi-party session achieving method based on session initiation protocol (SIP) - Google Patents
Multi-party session achieving method based on session initiation protocol (SIP) Download PDFInfo
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Abstract
The invention relates to a multi-party session achieving method based on a session initiation protocol (SIP). The method mainly solves the problem that the prior art can not be used due to incompatibility of an operation client side and a server side. The method comprises the steps that (1) all multi-media meeting rooms are established in a pre-appointed mode, (2) interpreters are called to be in a meeting system, (3) all participants except the interpreters are connected to the meeting system in a calling-out mode by a multi-point control server, (4) the multi-point control server is connected with multiple terminal agents through the SIP, and transmits a service description protocol (SDP) of a multimedia meeting to terminals in the process of connection establishing, (5) multimedia meeting session is conducted, (6) the session is finished, and current multimedia meeting room resources are released. According to the technical scheme, the problem is well solved. The multi-party session achieving method based on the SIP can be used for achieving a multi-party session based on the SIP.
Description
Technical field
The present invention relates to a kind of MPTY implementation method based on SIP.
Background technology
Along with the enriching constantly and globalizing of human social economy's cultural activity, interpersonal information interchange is more and more frequent, and meeting just seems more and more important as a kind of platform of information interchange.Under these circumstances, multimedia conferencing naturally is work cohort and the individual mode that various shared information resources are provided, and needn't consider between them a wall every, still be separated by ten thousand li, and with its characteristics conveniently, apply to increasing field, obtained more and more people's approval.The main flow multimedia conference system is divided into two kinds, a kind of H.323 multimedia conference system of agreement that is based at present; Another kind is based on the SIP(session initiation protocol) multimedia conference system, and as the multimedia conference system of maximum H.323 agreement of using on market complexity and the shortcoming such as ineffective activity due to himself, gradually by simply, the SIP multimedia conference system replaces flexibly, and SIP has demonstrated powerful advantage holding meeting room interim, emergent, loose shape, so, have important using value based on the MPTY technology of SIP in the multimedia conference system based on SIP.
In recent years, conversation initialized protocol (SIP) development is swift and violent, along with international large manufacturer supports gradually, has become the leading protocol in VOIP field.Good autgmentability from Session Initiation Protocol is born certainly, own multipoint conference method and system based on Session Initiation Protocol have been founded by a lot of manufacturers.This has just caused common sip user agent client and the most of multipoint controller (MCU) can't compatible situation.The MCU of each manufacturer can only be logged in by proprietary client, perhaps general client can log in, point-to-point communication, but can't complete normal meeting.
At present, relatively universal sip user agent client by repeatedly calling out, also can realize simple and complicated conferencing function.The principle that realizes of above-mentioned multimedia conferencing is: A, B, C tripartite need voice conferencing, and A calls out B and connects, and then A calls out C, B calling C and completes the connection of tripartite's voice successively.Learn by simple computation, A exists on 2 road RTP to be spreaded, and has 2 road RTP download stream.Carry out voice conferencing as x side, wherein either party RTP upload and download stream all has the x road.This has higher requirement and pressure for the network bandwidth.If in many ways carry out video conference, each demand bandwidth of taking turns rtp streaming is larger, on ADSL or other broadband networks now, even can't complete.
In addition, when using multilingual in above-mentioned multimedia conferencing, need to carry out oral translation (being called for short interpretation) to spokesman's speech content.generally be provided with special translation meeting-place in prior art in meeting room, and carry out speech processes take meeting room as unit, each meeting room only has a mixer, this pattern can't satisfy international exchange activity requirement, international style exchanges and comprises meeting, commercial affairs exchange, product recommendations can wait, this conferencing environment requires multilingual information can issue simultaneously and allow sponsor to exchange at any time with the country variant personnel, and some multimedia conference systems of existing market must be offered a plurality of meeting rooms for different language, guarantee multilingual audio frequency is mixed and be sent to different objects simultaneously, obvious this mode is uneconomic and brings the not convenient of operation.
Chinese invention patent 200910179642.1 discloses a kind of method, Apparatus and system of supporting simultaneous interpretation video conference, this invention adopts each conference terminal to translate rear output to the raw tone in meeting-place according to the interpreter language type of self, by the MCU(multipoint controller) translated speech after meeting terminal translation is carried out stereo process after, then send to the method for other conference terminal according to language form.But this invention exists each meeting room that oneself body translation and the common sip user agent client shortcoming of conference participation at any time must be set.
Chinese invention patent 20061004006.1 discloses a kind of simultaneous interpretation video conference system and method for supporting high capacity mixed sound, and this invention has proposed based on Mel yardstick cepstrum feature and SVMs mute detection method and the method for carrying out multilingual synchronous mixed audio at same meeting room.But there is the common sip user agent client shortcoming of conference participation at any time in this invention.
Summary of the invention
Technical problem to be solved by this invention be prior art exist running client and service end incompatible, cause the problem that can't use, a kind of new MPTY implementation method based on SIP is provided.The method not only can reduce the requirement to the terminal network bandwidth, support has various terminal of different performance network bandwidth performance, and common without any conferencing function sip user agent client also conference participation at any time, improved flexibility and the compatibility of meeting room.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of MPTY implementation method based on SIP comprises the following steps:
1) reservation creates all multimedia conferencings chambers;
2) at first by interpreter's incoming call to conference system;
3) participant of all except the interpreter is by multipoint control server employing exhalation mode accessing conference system;
4) multipoint control server uses SIP(Session Initiation Protocol, session initiation protocol) set up respectively and be connected the connection of terminal agent, and in the process of connecting with the business description agreement SDP(Session Description Protocol of multimedia conferencing) send each terminal to;
5) carry out the multimedia conferencing session;
6) conversation end discharges current multimedia conferencing chamber resource;
Wherein, described multipoint control server MCU(Multipoint Control Unit) comprise multipoint controller and media server; Multipoint controller is responsible for processing the strategy of member and media, and keeps with the SIP signaling of each conversation member and be connected; The Media Stream that media server is carried out conversation member by the instruction that receives multipoint controller mixes and distribution; Described terminal comprises user terminal and conference terminal.
In technique scheme, preferably, described terminal agent adopts the SDP conversational mode to the process that multipoint control server sends the INVITE request.
In technique scheme, preferably, described multipoint control server adopts the SDP conversational mode to the process that terminal agent sends the INVITE request.
In technique scheme, preferably, the interface between described media server and described multipoint controller adopts MGCP MGCP(Media Gateway Control Protocol) agreement or Session Initiation Protocol.
In technique scheme, preferably, adopt realtime transmission protocol RTP (Realtime Transport Protocol)/RTCP Real-time Transport Control Protocol RTCP(Realtime Transport Control Protocol between described media server and described terminal) communicate by letter.
In technique scheme, preferably, described multipoint control server MCU adopts a plurality of MCU mode of work side by side.
In technique scheme, preferably, described media server is processed respectively the audio signal, vision signal and the digital signal that receive each terminal under the control and management of multipoint controller, and sends each terminal after processing.More preferably, described media server comprises the Audio Signal Processing process that receives each terminal: audio signal is comprised the process of the multilingual synchronous mixed audio that voice weaken to be processed and the audio frequency after audio mixing sent to the process of each terminal.
One of the present invention preferred embodiment comprises following process:
1) take reservation multimedia conferencing chamber;
2) first, second terminal adopts the SDP conferencing to send the INVITE request to multipoint control server respectively;
3) multipoint control server is first, second terminal distribution port passage that connects, and sends successful connection message to first, second terminal;
4) carry out the multimedia conferencing session;
5) conversation end is reusable with this multimedia conferencing resource mark.
Of the present invention another preferred embodiment comprises following process:
1) take reservation multimedia conferencing chamber;
2) multipoint control server adopts the SDP conferencing to send the INVITE request to first, second terminal, and is first, second terminal distribution port passage that connects;
3) first, second terminal sends respectively the message of successful connection to multipoint control server;
4) carry out the multimedia conferencing session;
5) conversation end is reusable with this multimedia conferencing resource mark.
The present invention adopts a plurality of multipoint control server MCU, as far as possible compatible more service end.The present invention has also adopted SIP and the SDP related protocol of standard, not only almost support all sip user clients, and what of the number formulary amount of no matter attending a meeting, audio mixing always carries out at multipoint control server, audio stream only has 1 the road to upload and 1 tunnel download in the sip user client, reduce the terminal network bandwidth occupancy, improved flexibility and the compatibility of meeting room; In addition, this invention is used for the simultaneous interpretation multimedia conference service, can effectively solve the problem that translation sound and spokesman's original language sound are easy to obscure, and has obtained technique effect preferably.
Description of drawings
Fig. 1 is a kind of MPTY implementation method structural representation based on SIP of the present invention.
Fig. 2 is a plurality of MCU transfer agreement operation principle schematic diagram of the present invention.
Fig. 3 is the incoming call type MPTY flow chart based on SIP of the present invention.
Fig. 4 is the call-out type MPTY flow chart based on SIP of the present invention.
For making purpose of the present invention, technical scheme and effect clearer, clear and definite, below the present invention is described in more detail.Should be appreciated that, specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 is the MPTY implementation method structural representation based on SIP of the present invention, and as shown in the figure, described method adopts following thinking:
(1) MPTY is by multipoint control server MCU(Multipoint Control Unit) realize, and multipoint control server adopts a plurality of MCU mode of work side by side, mutually exchange meeting control information, state information, information about firms and media information etc. by certain communication protocol between them, the function of convention is completed in common cooperation; Simultaneously can back up a MCU, therein during any MCU something unexpected happened cisco unity malfunction, in the unware situation of user, the work that the MCU of backup can take over this MCU that breaks down, in addition when wherein arbitrary MCU login user reaches this MCU operating limit, system will be automatically with the new login user assignment to other MCU that close on.
(2) each multipoint control server MCU comprises multipoint controller and media server, and media server can comprise a plurality of blenders, multipoint controller is responsible for processing the strategy of member and media, and keep with the SIP signaling of each conversation member and be connected, the Media Stream that media server is carried out conversation member by the instruction that receives multipoint controller (comprises video, audio frequency, text etc.) can be the participant of meeting or other media server, the process of processing in audio mix is in addition passed through different audio streams is adjusted the volume optimization process of arbitrary audio signal in real time at certain Nodes, make the more clear sense that has levels of sound after audio mixing.
(3) by following process implementation MPTY: 301. reservations create all multimedia conferencings chambers; 302. multipoint control server uses SIP(Session Initiation Protocol, session initiation protocol) set up respectively and be connected terminal and (comprise that user terminal is connected the connection of acting on behalf of with conference terminal, and in the process of connecting with the business description agreement SDP(Session DescriptionProtocol of multimedia conferencing, session protocol is described) send each terminal to; 303. carry out the multimedia conferencing session; 304. conversation end discharges current multimedia conferencing chamber resource.
Wherein, the user who creates meeting can pass through IE browser access conference system web management interface, carries out conference reservation, and the relevant attribute of meeting is set, and as meeting participant, meeting start time etc., then issues meeting by Web; In addition, the terminal use also can pass through dialing and initiating conference.In conference process, the user can pass through the modes such as Web server, instant message and obtain in advance the meeting related news, adds Conference ID and adds meeting by calling out special number, also can be after meeting begins, multipoint control server sends INVITE to the user, invites the user to add meeting.The mode of closing session is passed through all, and BYE message withdraws from meeting or multipoint control server sends BYE message termination meeting to all users with sending to multipoint control server per family.
Fig. 2 is a plurality of MCU transfer agreement operation principle schematic diagram of the present invention, and as shown in the figure, when adopting a plurality of MCU transfer agreement, source user connects purpose user, the SourceID that MCU obtains flowing by the MCU that distributes; Then, inquiry purpose user's MCU, and notify the purpose user receiving stream-oriented data by purpose user's MCU, and wherein comprise the address of source MCU, prepare against the mutual of data flow.
Fig. 3 is the incoming call type MPTY flow chart based on SIP of the present invention, as shown in the figure, the user can pass through the modes such as E-mail, Web bulletin, instant message and obtain in advance meeting URI(UniformResource Identifier, the generic resource identifier), then the server to conference system sends INVITE, request adds meeting, and its flow process is as follows:
1) participant 1 terminal agent and participant's 2 terminal agent adopts the SDP conferencing to send the INVITE request to multipoint control server respectively;
2) multipoint control server sends to participant 1 terminal agent and participant 2 terminal agent the response message 200OK that represents successful connection respectively;
3) participant 1 and participant 2 confirm to multipoint control server transmission ACK message respectively;
4) participant 1 and participant 2 carry out session;
5) when having newcomer participant's 3 applications to add session, participant 3 terminal agent adopts the SDP conferencing to send the INVITE request to multipoint control server;
6) multipoint control server represents the response message 200OK of successful connection to participant 3 terminal agent, and send Conf(Conference calling, Conference Calling to participant 1 terminal agent and participant 2 terminal agent respectively simultaneously) the message notice;
7) participant 3 terminal agent is confirmed to multipoint control server transmission ACK message, and participant 1 terminal agent and participant's 2 terminal agent sends the 200OK response message to multipoint control server respectively;
8) participant 1, participant 2 and participant 3 carry out session, and multipoint control server is responsible for stereo process.
Fig. 4 is the call-out type MPTY flow chart based on SIP of the present invention, as shown in the figure, the meeting promoter surfs the Net one period meeting period of reservation, and login member's (URI lists of all participants) that will invite, conference system can send INVITE from the trend user, invite it to add meeting, its flow process is:
1) terminal agent participant 1(meeting promoter) adopts the SDP conferencing to send the INVITE request to multipoint control server;
2) multipoint control server sends response message 100Trying in call treatment to participant 1 terminal agent;
3) multipoint control server sends the response message 200OK of expression successful connection to participant 1 terminal agent;
4) participant 1 confirms to multipoint control server transmission ACK message, enters meeting room;
5) multipoint control server initiatively adopts the SDP conferencing to send the INVITE request to participant 2 terminal agent and participant 3 terminal agent respectively;
6) participant 2 terminal agent and participant's 3 terminal agent sends respectively the response message 200OK of expression successful connection to multipoint control server;
7) multipoint control server sends ACK message to participant 2 terminal agent and participant's 3 terminal agent respectively and confirms, and sends Conf(Conference calling, Conference Calling to participant 1 terminal agent simultaneously) the message notice;
8) participant 1 terminal agent sends the 200OK response message to multipoint control server;
9) participant 1, participant 2 and participant 3 carry out session, and multipoint control server is responsible for stereo process.
In addition, when there being new member to add, old member can receive that Conf message notice has the newcomer to add, when there being the member to withdraw from, and also need to be with all members of Conf message.
The invention will be further elaborated below by embodiment.
Embodiment
[embodiment 1]
With reference to Fig. 1, Fig. 2 and Fig. 3, specific to participant 1(user terminal A), participant 2(user terminal C) and participant 3(user terminal D) embodiment of the bilingual simultaneous interpretation talk business that participates in of tripartite, wherein 1 of participant understands Chinese, participant 2 understands Chinese and English, and 3 of participants know English.Participant 1, participant 2 and participant 3 announce by Web and obtain in advance meeting URI, then according to method shown in Figure 3, participant 1, participant 2 and participant 3 pass through separately sip terminal agency and send the INVITE request to the multipoint control server of conference system and add meeting to carry out Three-Way Calling.When participant's 1 speech, participant 2 translates simultaneously, according to illustrated in figures 1 and 2, participant 1 video flowing sends participant 2 and participant 3 by the multipoint control server that connects participant 1 to the multipoint control server that is connected participant 2, participant 3, participant 1 audio stream sends participant 2 by the multipoint control server that connects participant 1 to the multipoint control server that is connected participant 2, and the multipoint control server that connects participant 2 carries out participant 1 and participant's 2 audio signal to send participant 3 to after voice weaken mixed processing.Equally, when participant's 3 speech, participant 2 translates simultaneously, according to illustrated in figures 1 and 2, the multipoint control server that connection participant 2 is connected with the participant sends participant 3 video flowing to participant 2 and the multipoint control server that is connected participant 1, and the multipoint control server that then connects participant 1 sends participant 1 again to; Connecting simultaneously multipoint control server that participant 2 is connected with the participant is connected participant 2 with the participant audio signal carries out voice and weakens and send the multipoint control server that connects participant 1 to after mixed processing and send participant 1 to again.In above-mentioned Three-Way Calling, participant 1, participant 2 and participant 3 all pass through to send BYE message to multipoint control server and withdraw from meeting with end session.
[embodiment 2]
With reference to Fig. 1, Fig. 2 and Fig. 4, specific to participant 1(conference terminal A), participant 2(user terminal E) and participant 3(user terminal F) embodiment of the bilingual simultaneous interpretation convention business that participates in of tripartite, wherein 1 of participant understands Chinese, participant 2 understands Chinese and French, and 3 of participants understand French.Participant 1(meeting promoter) participant 2 and participant 3 that online one period meeting period of reservation, and login will invite.According to method shown in Figure 4, participant 1 acts on behalf of by conference terminal and dials special number 6100 and add meeting room, the multipoint control server of conference system adopts the SDP conferencing to send the INVITE request to participant 2, participant 3, invite participant 2(1000) and participant 3(1001) add meeting, carry out the multimedia conferencing session.When participant's 1 speech, participant 2 translates simultaneously, according to illustrated in figures 1 and 2, participant 1 video flowing sends participant 2 and participant 3 by the multipoint control server that connects participant 1 to the multipoint control server that is connected participant 2, participant 3, participant 1 audio stream sends participant 2 by the multipoint control server that connects participant 1 to the multipoint control server that is connected participant 2, and the multipoint control server that connects participant 2 carries out participant 1 and participant's 2 audio signal to send participant 3 to after voice weaken mixed processing.Equally, when participant's 3 speech, participant 2 translates simultaneously, according to illustrated in figures 1 and 2, the multipoint control server that connection participant 2 is connected with the participant sends participant 3 video flowing to participant 2 and the multipoint control server that is connected participant 1, and the multipoint control server that then connects participant 1 sends participant 1 again to; Connecting simultaneously multipoint control server that participant 2 is connected with the participant is connected participant 2 with the participant audio signal carries out voice and weakens and send the multipoint control server that connects participant 1 to after mixed processing and send participant 1 to again.In above-mentioned Three-Way Calling, multipoint control server is to stopping session by sending BYE message to participant 1, participant 2 and participant 3.
[embodiment 3]
With reference to Fig. 1, Fig. 2 and Fig. 3, participant 4(user terminal B) to participate in the MPTY in embodiment 1,4 of participants understand Chinese, and according to method shown in Figure 3, participant 4 passes through its sip terminal agency and adds meeting to carry out MPTY to the request of multipoint control server transmission INVITE.Multipoint control server sends Conf message notice to participant 1, participant 2 and participant's 3 terminal agent respectively has the newcomer to add.in carrying out the MPTY process, according to illustrated in figures 1 and 2, when participant's 4 speech, participant 2 translates simultaneously, the multipoint control server of participant 4 video flowing by connecting participant 4 be connected participant 2, participant 3 multipoint control server sends participant 2 and participant 3 to, participant 4 video flowing sends participant 1 by the multipoint control server that connects participant 4 to the multipoint control server that is connected participant 1, participant 4 audio stream sends participant 1 by the multipoint control server that connects participant 4 to the multipoint control server that is connected participant 1, participant 4 audio stream sends participant 2 by the multipoint control server that connects participant 4 to the multipoint control server that is connected participant 2, the multipoint control server that connects participant 2 carries out participant 4 and participant's 2 audio signal to send participant 3 to after voice weaken mixed processing.
[comparative example 1 ~ 3]
With [embodiment 1 ~ 3], just there is no multipoint control server, cause running client and service end incompatible, client broadband occupancy is large, and speed is slow, and in transmitting procedure, the voice quality damage greatly, can't be used.
Claims (10)
1. MPTY implementation method based on SIP comprises the following steps:
1) reservation creates all multimedia conferencings chambers;
2) at first by interpreter's incoming call to conference system;
3) participant of all except the interpreter is by multipoint control server employing exhalation mode accessing conference system;
4) multipoint control server uses session initiation protocol SIP to set up respectively and is connected the connection of terminal agent, and sends the business description agreement SDP of multimedia conferencing to each terminal in the process of connecting;
5) carry out the multimedia conferencing session;
6) conversation end discharges current multimedia conferencing chamber resource;
Wherein, described multipoint control server MCU comprises multipoint controller and media server; Multipoint controller is responsible for processing the strategy of member and media, and keeps with the SIP signaling of each conversation member and be connected; The Media Stream that media server is carried out conversation member by the instruction that receives multipoint controller mixes and distribution; Described terminal comprises user terminal and conference terminal.
2. according to claim 1 based on the MPTY implementation method of SIP, it is characterized in that described terminal agent adopts the SDP conversational mode to the process that multipoint control server sends the INVITE request.
3. according to claim 1 based on the MPTY implementation method of SIP, it is characterized in that described multipoint control server adopts the SDP conversational mode to the process that terminal agent sends the INVITE request.
4. according to claim 1 based on the MPTY implementation method of SIP, it is characterized in that the interface between described media server and described multipoint controller adopts MGCP MGCP agreement or Session Initiation Protocol.
5. according to claim 1 based on the MPTY implementation method of SIP, it is characterized in that adopting realtime transmission protocol RTP/RTCP Real-time Transport Control Protocol RTCP to communicate by letter between described media server and described terminal.
6. according to claim 1 based on the MPTY implementation method of SIP, it is characterized in that described multipoint control server MCU adopts a plurality of MCU mode of work side by side.
7. according to claim 1 based on the MPTY implementation method of SIP, it is characterized in that described media server processes respectively the audio signal, vision signal and the digital signal that receive each terminal under the control and management of multipoint controller, and send each terminal after processing.
8. according to claim 7 based on the MPTY implementation method of SIP, it is characterized in that described media server comprises the Audio Signal Processing process that receives each terminal: audio signal is comprised the process of the multilingual synchronous mixed audio that voice weaken to be processed and the audio frequency after audio mixing sent to the process of each terminal.
9. according to claim 1 based on the MPTY implementation method of SIP, it is characterized in that comprising following process:
1) take reservation multimedia conferencing chamber;
2) first, second terminal adopts the SDP conferencing to send the INVITE request to multipoint control server respectively;
3) multipoint control server is first, second terminal distribution port passage that connects, and sends successful connection message to first, second terminal;
4) carry out the multimedia conferencing session;
5) conversation end is reusable with this multimedia conferencing resource mark.
10. according to claim 1 based on the MPTY implementation method of SIP, it is characterized in that comprising following process:
1) take reservation multimedia conferencing chamber;
2) multipoint control server adopts the SDP conferencing to send the INVITE request to first, second terminal, and is first, second terminal distribution port passage that connects;
3) first, second terminal sends respectively the message of successful connection to multipoint control server;
4) carry out the multimedia conferencing session;
5) conversation end is reusable with this multimedia conferencing resource mark.
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