CN101150705A - A method for realizing multi-point conference video control in initial session protocol - Google Patents
A method for realizing multi-point conference video control in initial session protocol Download PDFInfo
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Abstract
A multipoint conference video control method in initial conversation protocal comprises following terminal label assignment flow: after a multipoint conference control unit is established call connection with terminals take part in the conference, sending terminal label assignment information to the terminals, carrying unique terminal label in the conference which is assigned for the terminals, after receiving the information, the terminals store the terminal lables assigned for themselves. Through the method of the invention, the terminals are took part in the multipoint conference, the multipoint conference video control is realized. By adopting the method of the invention, a gateway device in the multipoint conference system can realize corresponding switch of SIP information and H323 information easily, realize the terminals based on the SIP protocal and the terminals based on the H323 protocal take part in the same multipoint conference, realize comunication and control with each other.
Description
Technical field
The invention belongs to the video conferencing field, specifically, relate to the method that how terminal uses Session Initiation Protocol (initial session protocol) realization meeting to control in the multipoint videoconference system.
Background technology
Along with the fast development that IP network is used, Session Initiation Protocol with its flexibly extensibility in TV conference system, used widely, a lot of video conference terminals has all no longer been supported traditional H.323 agreement now, but only supports Session Initiation Protocol.
And in Session Initiation Protocol, just concrete regulation session (promptly call out and connect) how to set up, medium a series of message definitions relevant such as how to hold consultation with communication, but for how realizing multiple spot control after connect setting up, thereby cause each self-defined oneself cover message of each producer and flow process to realize multipoint conference control not about the common standard of concrete process description and corresponding message definition.In case the end product based on Session Initiation Protocol of different manufacturers is gathered together, just can't realize the mutual control of multipoint conference, realize the multipoint conference function.And when traditional TV conference system links to each other, only can realize the medium intercommunication, can't realize the multipoint conference controlled function of enriching.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method that realizes meeting control based on terminal in the multipoint conference of Session Initiation Protocol.
In order to address the above problem, the invention provides a kind of method that in initial session protocol, realizes the control of multipoint conference video, it is characterized in that, comprise the flow process that following terminal number is distributed:
Multipoint conference control unit and the terminal that participates in a conference set up call out be connected after, send terminal number assignment messages terminalLabelAssignment to described terminal, carry terminal number unique in the meeting for described terminal distribution, terminal saves as the terminal number of oneself distributing after receiving described message.
Further, said method also can comprise the flow process of following terminal to apply token:
When the terminal that participates in a conference wishes to obtain the control of meeting, send chairman's token request message makeMeChairRequest, chairman's token of request meeting to the multipoint conference control unit;
After described multipoint conference control unit is received described request, reply chairman's token request response makeMeChairResponse, as there not being chairman in the meeting, the object information in the message is agreement, otherwise is refusal;
When the object information in the described chairman's token of the described terminal judges request response of transmission chairman token request message is agreement, can carry out the control of meeting.
Further, said method can comprise that also following terminal discharges the flow process of token:
When the terminal of acquisition chairman token does not need meeting to be controlled again, send release Chair token request message cancelMakeMeChairRequest to the multipoint conference control unit;
After described multipoint conference control unit is received described message, reply release Chair token request response message makeMeChairResponse to described terminal, as agree that it discharges token, object information is agreement in the message, otherwise object information is refusal in the message.
Further, said method also can comprise the sound of following terminal broadcasting oneself and/or the flow process of video:
The terminal that obtains chairman's token wishes that all participant terminals all hear and/or see the sound of oneself and/or during video image, send the own media channel request message broadcastMyLogicalChannelRequest of broadcasting to the multipoint conference control unit, have the audio frequency media channel number and/or the video media channel number of this terminal in the message;
After described multipoint conference control unit is received described message, as agree its operation, return the own media channel request response broadcastMyLogicalChannelResponse of broadcasting to it, object information in the message is for agreeing, the corresponding media channel data broadcasting of terminal that will obtain chairman's token is simultaneously given all participant terminals, and the sound or the video image of the terminal that obtains chairman's token all can be heard and/or see to all participant terminals; As disagree with its operation, the object information in the own media channel request response of the broadcasting of returning is refusal, all participant terminals hear and/or sound and/or the video seen constant.
Further, said method also can comprise the flow process of the video of a certain terminal of following terminal video broadcasting:
When the terminal of acquisition chairman token wishes to broadcast the video image of a certain terminal that participates in a conference, send broadcast terminal video request message m akeTerminalBroadcasterRequest to the multipoint conference control unit, have the terminal number of the terminal that will be broadcasted in the message;
After described multipoint conference control unit is received this message, as agree its operation, then return broadcast terminal video request response message makeTerminalBroadcasterResponse to it, object information in the message is for agreeing, the video data that will be broadcasted terminal simultaneously is broadcast to all participant terminals, and all participant terminals all can be seen the video image of the terminal that obtains chairman's token; As disagree with its operation, and then the object information in the broadcast terminal video request response message that returns is refusal, the video that this moment, all participant terminals were seen is constant.
Further, said method can comprise that also the choosing of following terminal sees the flow process of the video of a certain terminal:
When the terminal of acquisition chairman token wishes to see the video image of a certain terminal that participates in a conference, send choosing to the multipoint conference control unit and see terminal video request message sendThisSourceRequest, have the terminal number that its wishes this terminal of seeing in the message;
After described multipoint conference control unit is received this message, as agree its operation, return choosing to it and see terminal video request response message sendThisSourceResponse, the object information in the message is for agreeing that the video data with the selected terminal of seeing switches to the terminal that obtains chairman's token simultaneously; As disagree with its operation, then see that to its choosing of returning the object information in the terminal video request response message is refusal;
After the terminal of acquisition chairman token receives that terminal video request response message is seen in choosing, be agreement as the object information in the message, this terminal will be seen the video image of its selected terminal of seeing, otherwise the video that this terminal is seen is constant.
Further, said method also can comprise the flow process of a certain terminal in the following terminal deletion meeting:
During a certain terminal deletion that the terminal that obtains chairman's token wishes to participate in a conference, send deletion terminal request message dropTerminalRequest, have the terminal number that its wishes the terminal of deletion in the message to the multipoint conference control unit;
After described multipoint conference control unit is received this message, as agree its operation, then return deletion terminal request response message dropTerminalResponse to it, the object information in the message is connected with the calling of deleted terminal for agreeing, disconnecting simultaneously; As disagree with its operation, and then the object information in the deletion terminal request response message that it returns is refusal, all conference members do not change.
Further, said method can comprise that also following terminal closes the flow process of meeting:
When the terminal of acquisition chairman token wishes to close meeting, can send to the multipoint conference control unit and close meeting message dropConference;
After described multipoint conference control unit was received this message, with all disconnections of calling connection of all the participant terminals in the meeting, all-calls was closed meeting after connecting disconnection, the release resource.
Further, said method also can have following characteristics:
The related news of described multipoint conference control are by the transmission of SIP INFO method, and wherein the content of message body part is used the XML coded system.
Further, said method also can have following characteristics:
Described terminal is based on the terminal of initial session protocol or based on the terminal of agreement H.323, when described multipoint conference control unit and described terminal interaction based on agreement H.323, need finish the conversion between H323 agreement and the initial session protocol form.
As can be seen, by the inventive method, after terminal adds multipoint conference, can realize multipoint conference control.Adopt method described in the invention, gateway device in the multi-spot video conference system can be realized the corresponding conversion of sip message and H323 message easily, realize at an easy rate based on the terminal of Session Initiation Protocol with based on the same multipoint conference of the terminal-joined of H323 agreement, and realize the intercommunication cross complaint.
Description of drawings
Fig. 1 is the flow chart that terminal number is distributed among the present invention;
Fig. 2 is the flow chart of terminal to apply chairman among the present invention;
Fig. 3 is the flow chart of terminal release Chair among the present invention;
Fig. 4 is the flow chart of the media channel of terminal broadcasting oneself;
Fig. 5 is the flow chart of a certain terminal video of terminal video broadcasting;
Fig. 6 is the flow chart that a certain terminal video is seen in the terminal choosing;
Fig. 7 is the flow chart that terminal disconnects a certain terminal in the meeting;
Fig. 8 is the flow chart that terminal is closed meeting.
Embodiment
Below in conjunction with accompanying drawing how terminal among the present invention is realized that session control function describes.
The related news of multipoint conference controlled function transmit by SIP INFO method, and wherein the content of message body (Message body) part can have different coded systems, but in order to realize intercommunication, present embodiment uses the XML coded system.
Below will describe the realization flow and the related news definition of multipoint conference controlled function, but need to prove that the present invention comprises but is not limited only to following content.
The first, the method for numbering serial of multipoint conference terminal
Realize multipoint conference control, will will identify all terminals of participating in multipoint conference earlier that the multipoint conference control unit all distributes a unique terminal number as sign for each terminal that participates in a conference, and can be numeral, span is at 1-65535; Can be character string, the ASCII coding, length can be other forms also at 1-512 character, is unique as long as guarantee in meeting.
The second, multipoint conference controlled function realization flow is subdivided into following sub-process again:
1) terminal number is distributed
The terminal that each is connected with the multipoint conference control unit, in case successful, the multipoint conference control unit just distributes a unique terminal number as its unique identification in this meeting for it when its connection.
Fig. 1 is the flow chart that terminal number is distributed among the present invention, the multipoint conference control unit in case with the terminal that participates in a conference set up call out be connected after, send terminal number assignment messages terminalLabelAssignment (writing a Chinese character in simplified form TIA) to this terminal, carried terminal numbering (TerminalLabel) in the message at once.Be used to terminal number (TerminalLabel) unique in meeting of this terminal distribution, as its unique identification in meeting.Terminal saves as the terminal number of oneself distributing after receiving TIA message.
2) terminal to apply/release Chair token
The flow chart of terminal to apply chairman token may further comprise the steps as shown in Figure 2:
The a certain terminal that participates in a conference wishes to obtain the control of meeting, and sending chairman's token request message to the multipoint conference control unit is makeMeChairRequest (being abbreviated as CCA) message, chairman's token of request meeting;
After the multipoint conference control unit is received this message, whether in meeting had chairman: if there is not chairman if judging, then agree chairman's token request of this terminal, send chairman token request response makeMeChairResponse (being abbreviated as CCR) to it, the object information in the message is for agreeing; If there has been chairman in the meeting, the multipoint conference control unit will be refused chairman's token request of this terminal, then sends request Chair token response message m akeMeChairResponse (being abbreviated as CCR) to it, and the object information in the message is refusal;
After the terminal of sending CCA message is received CCR message, judge the result in the message, as for agreeing, then this moment, this terminal obtained chairman's token of meeting, and this terminal can be carried out the control of meeting; As being refusal, then chairman's token that this moment, this terminal did not obtain meeting can not carry out meeting control.
The flow chart of terminal release Chair token may further comprise the steps as shown in Figure 3:
When the terminal of acquisition chairman token does not need meeting to be controlled again, can send release Chair token request message cancelMakeMeChairRequest (being abbreviated as CIS) to the multipoint conference control unit, request discharges chairman's token;
After the multipoint conference control unit is received this message, as agree its release Chair token, reply release Chair token request response message makeMeChairResponse (being abbreviated as CCR), object information is refusal in the message, shows to agree that it discharges token; As refuse its release Chair token, and reply CCR message, object information shows that for agreeing it still has chairman's token of meeting in the message.
3) sound/video (sound and/or video) of terminal broadcasting oneself
The flow chart of the media channel of terminal broadcasting oneself may further comprise the steps as shown in Figure 4:
The terminal that obtains chairman's token wishes that all participant terminals all hear and/or see the sound of oneself and/or during video image, it can send broadcasting own media channel request message broadcastMyLogicalChannelRequest (being abbreviated as MCVReq) to the multipoint conference control unit, has its audio frequency media channel number and/or video media channel number in the message;
After the multipoint conference control unit is received this message, as agree its operation, then return broadcasting own media channel request response broadcastMyLogicalChannelResponse (being abbreviated as MCVRsp) to it, object information in the message is for agreeing that the corresponding media channel data broadcasting of terminal that will obtain chairman's token is simultaneously given all participant terminals; Disagree with its operation as the multipoint conference control unit, then return MCVRsp message to it, the object information in the message is refusal;
After the terminal of acquisition chairman token is received MCVRsp message, be agreement as the object information in the message, this moment, the sound and/or the video image of the terminal that obtains chairman's token all can be heard or see to all participant terminals; Be refusal as the object information in the message, then this moment all participant terminals hear or sound and/or the video seen constant.
4) video of a certain terminal of terminal video broadcasting
The flow chart of a certain terminal video of terminal video broadcasting may further comprise the steps as shown in Figure 5:
When the terminal of acquisition chairman token wishes to broadcast the video image of a certain terminal that participates in a conference, send broadcast terminal video request message m akeTerminalBroadcasterRequest (being abbreviated as VCBReq) to the multipoint conference control unit, have the terminal number of the terminal that will be broadcasted in the message;
After the multipoint conference control unit is received this message, as agree its operation, then return broadcast terminal video request response message makeTerminalBroadcasterResponse (being abbreviated as VCBRsp) to it, object information in the message is for agreeing that the video data that will be broadcasted terminal simultaneously is broadcast to all participant terminals; Disagree with its operation as the multipoint conference control unit, then return VCBRsp message to it, the object information in the message is refusal;
After the terminal of acquisition chairman token is received VCBRsp message, be agreement as the object information in the message, this moment, all participant terminals all can be seen the video image of the terminal that obtains chairman's token; Be refusal as the object information in the message, then the video that this moment, all participant terminals were seen is constant.
5) video of a certain terminal is seen in the terminal choosing
The flow process that a certain terminal video is seen in terminal choosing may further comprise the steps as shown in Figure 6:
When the terminal of acquisition chairman token wishes to see the video image of a certain terminal that participates in a conference, send choosing to the multipoint conference control unit and see terminal video request message sendThisSourceRequest (being abbreviated as VCSReq), have the terminal number that its wishes this terminal of seeing in the message;
After the multipoint conference control unit is received this message, as agree its operation, return choosing to it and see terminal video request response message sendThisSourceResponse (being abbreviated as VCSRsp), object information in the message is for agreeing that the video data with the selected terminal of seeing switches to the terminal that obtains chairman's token simultaneously; As disagree with its operation, and then returning VCSRsp message to it, the object information in the message is refusal;
After the terminal of acquisition chairman token is received VCSRsp message, be agreement as the object information in the message, the terminal that obtains chairman's token this moment will be seen the video image of its selected terminal of seeing; Be refusal as the object information in the message, it is constant then to obtain the video that the terminal of chairman's token sees this moment.
6) a certain terminal in the terminal deletion meeting
The flow process of a certain terminal may further comprise the steps as shown in Figure 7 in the terminal disconnection meeting:
During a certain terminal deletion that the terminal that obtains chairman's token wishes to participate in a conference, can send deletion terminal request message dropTerminalRequest (being abbreviated as CCDReq) to the multipoint conference control unit, have the terminal number that it wishes the terminal of deletion in the message;
After the multipoint conference control unit is received this message, as agree its operation, then return deletion terminal request response message dropTerminalResponse (being abbreviated as CCDRsp) to it, the object information in the message is connected with the calling of deleted terminal for agreeing, disconnecting simultaneously; Disagree with its operation as the multipoint conference control unit, then return CCDRsp message to it, the object information in the message is refusal;
After the terminal of acquisition chairman token is received CCDRsp message, be agreement as the object information in the message, not in meeting, it can't hear or see the sound or the video image of meeting at this moment deleted terminal; Be refusal as the object information in the message, then Ci Shi all conference members do not change.
7) terminal is closed meeting
The flow process that terminal is closed meeting may further comprise the steps as shown in Figure 8:
When the terminal of acquisition chairman token wishes to close meeting, can send to the multipoint conference control unit and close meeting message dropConeference (being abbreviated as CCK);
After the multipoint conference control unit was received this message, all disconnections of calling connection with all the participant terminals in the meeting comprised the terminal that obtains chairman's token, and all-calls is closed meeting after connecting disconnection, discharges resource.
Here again the related news of above-mentioned meeting control are concentrated and are described below:
A, terminal number assignment messages terminalLabelAssignment (TIA)
Function: realize that the multipoint conference control unit is the unique identification terminal number in the terminal distribution meeting
Message content: terminal number (TerminalLabel)
B, chairman's token request message makeMeChairRequest (CCA)/chairman's token request response makeMeChairResponse (CCR)
Function: realize that terminal is to multipoint conference control unit request Chair token
Message content:
MakeMeChairResponse: request results, result are divided into agreement and refuse two kinds
C, release Chair token request message cancelMakeMeChairRequest (CIS)/release Chair token request response message makeMeChairResponse (CCR)
Function: realize having the terminal of chairman's token to multipoint conference control unit release Chair token
D broadcasts own media channel request message
BroadcastMyLogicalChannelRequest (the MCVReq)/own media channel request response broadcastMyLogicalChannelResponse of broadcasting (MCVRsp)
Function: realization has the media channel of the terminal broadcasting oneself of chairman's token
Message content:
BroadcastMyLogicalChannelRequest: the media channel sign broadcastMyLogicalChannelResponse that broadcast: request results, the result is for agreeing and refusing two kinds
E, broadcast terminal video request message m akeTerminalBroadcasterRequest (VCBReq)/broadcast terminal video request response message makeTerminalBroadcasterResponse (VCBRsp)
Function: realize having a certain terminal video in the terminal broadcast conference of chairman's token
Message content:
MakeTerminalBroadcasterRequest: the terminal number makeTerminalBroadcasterResponse of the terminal that broadcast: request results, the result is for agreeing and refusing two kinds
F, choosing sees that terminal video request message sendThisSourceRequest (VCSReq)/choosing sees terminal video request response message sendThisSourceResponse (VCSRsp)
Function: realization has the terminal of chairman's token and selects a certain terminal video of seeing in the meeting
Message content:
SendThisSourceRequest: the terminal number sendThisSourceResponse that the selected terminal of seeing: request results, the result is for agreeing and refusing two kinds
G, deletion terminal request message dropTerminalRequest (CCDReq)/deletion terminal request response message dropTerminalResponse (CCDRsp)
Function: realize having a certain terminal in the terminal deletion meeting of chairman's token
Message content:
DropTerminalRequest: the terminal number dropTerminalResponse of terminal that be deleted: request results, the result is for agreeing and refusing two kinds
H closes meeting message dropConference (CCK)
Function: realization has the terminal of chairman's token and closes meeting
As from the foregoing, the invention provides the method for transmitting the multipoint conference control messages in a kind of Session Initiation Protocol, the unified multipoint conference controlled function that according to said method realizes based on Session Initiation Protocol of each manufacturer just can realize that the product of different manufacturers can carry out various meeting control operations easily in same multipoint conference.Meeting control operation described in the present invention simultaneously and operation compatibility in traditional TV conference system, Session Initiation Protocol and H.323 the protocol signaling gateway can only do a kind of conversion and can realize intercommunication cross complaint based on the TV conference system of the conference terminal of Session Initiation Protocol and traditional H323 agreement.
Claims (10)
1. a method that realizes the control of multipoint conference video in initial session protocol is characterized in that, comprises the flow process that following terminal number is distributed:
Multipoint conference control unit and the terminal that participates in a conference set up call out be connected after, send terminal number assignment messages terminalLabelAssignment to described terminal, carry terminal number unique in the meeting for described terminal distribution, terminal saves as the terminal number of oneself distributing after receiving described message.
2. the method for claim 1 is characterized in that: the flow process that also comprises following terminal to apply token:
When the terminal that participates in a conference wishes to obtain the control of meeting, send chairman's token request message makeMeChairRequest, chairman's token of request meeting to the multipoint conference control unit;
After described multipoint conference control unit is received described request, reply chairman's token request response makeMeChairResponse, as there not being chairman in the meeting, the object information in the message is agreement, otherwise is refusal;
When the object information in the described chairman's token of the described terminal judges request response of transmission chairman token request message is agreement, can carry out the control of meeting.
3. the method for claim 1 is characterized in that: comprise that also following terminal discharges the flow process of token:
When the terminal of acquisition chairman token does not need meeting to be controlled again, send release Chair token request message cancelMakeMeChairRequest to the multipoint conference control unit;
After described multipoint conference control unit is received described message, reply release Chair token request response message makeMeChairResponse to described terminal, as agree that it discharges token, object information is agreement in the message, otherwise object information is refusal in the message.
4. the method for claim 1 is characterized in that: also comprise the sound of following terminal broadcasting oneself and/or the flow process of video:
The terminal that obtains chairman's token wishes that all participant terminals all hear and/or see the sound of oneself and/or during video image, send the own media channel request message broadcastMyLogicalChannelRequest of broadcasting to the multipoint conference control unit, have the audio frequency media channel number and/or the video media channel number of this terminal in the message;
After described multipoint conference control unit is received described message, as agree its operation, return the own media channel request response broadcastMyLogicalChannelResponse of broadcasting to it, object information in the message is for agreeing, the corresponding media channel data broadcasting of terminal that will obtain chairman's token is simultaneously given all participant terminals, and the sound or the video image of the terminal that obtains chairman's token all can be heard and/or see to all participant terminals; As disagree with its operation, the object information in the own media channel request response of the broadcasting of returning is refusal, all participant terminals hear and/or sound and/or the video seen constant.
5. the method for claim 1 is characterized in that: the flow process that also comprises the video of a certain terminal of following terminal video broadcasting:
When the terminal of acquisition chairman token wishes to broadcast the video image of a certain terminal that participates in a conference, send broadcast terminal video request message m akeTerminalBroadcasterRequest to the multipoint conference control unit, have the terminal number of the terminal that will be broadcasted in the message;
After described multipoint conference control unit is received this message, as agree its operation, then return broadcast terminal video request response message makeTerminalBroadcasterResponse to it, object information in the message is for agreeing, the video data that will be broadcasted terminal simultaneously is broadcast to all participant terminals, and all participant terminals all can be seen the video image of the terminal that obtains chairman's token; As disagree with its operation, and then the object information in the broadcast terminal video request response message that returns is refusal, the video that this moment, all participant terminals were seen is constant.
6. the method for claim 1 is characterized in that: comprise that also following terminal choosing sees the flow process of the video of a certain terminal:
When the terminal of acquisition chairman token wishes to see the video image of a certain terminal that participates in a conference, send choosing to the multipoint conference control unit and see terminal video request message sendThisSourceRequest, have the terminal number that its wishes this terminal of seeing in the message;
After described multipoint conference control unit is received this message, as agree its operation, return choosing to it and see terminal video request response message sendThisSourceResponse, the object information in the message is for agreeing that the video data with the selected terminal of seeing switches to the terminal that obtains chairman's token simultaneously; As disagree with its operation, then see that to its choosing of returning the object information in the terminal video request response message is refusal;
After the terminal of acquisition chairman token receives that terminal video request response message is seen in choosing, be agreement as the object information in the message, this terminal will be seen the video image of its selected terminal of seeing, otherwise the video that this terminal is seen is constant.
7. the method for claim 1 is characterized in that: the flow process that also comprises a certain terminal in the following terminal deletion meeting:
During a certain terminal deletion that the terminal that obtains chairman's token wishes to participate in a conference, send deletion terminal request message dropTerminalRequest, have the terminal number that its wishes the terminal of deletion in the message to the multipoint conference control unit;
After described multipoint conference control unit is received this message, as agree its operation, then return deletion terminal request response message dropTerminalResponse to it, the object information in the message is connected with the calling of deleted terminal for agreeing, disconnecting simultaneously; As disagree with its operation, and then the object information in the deletion terminal request response message that it returns is refusal, all conference members do not change.
8. the method for claim 1 is characterized in that: comprise that also following terminal closes the flow process of meeting:
When the terminal of acquisition chairman token wishes to close meeting, can send to the multipoint conference control unit and close meeting message dropConference;
After described multipoint conference control unit was received this message, with all disconnections of calling connection of all the participant terminals in the meeting, all-calls was closed meeting after connecting disconnection, the release resource.
9. as the described method of arbitrary claim in the claim 1 to 7, it is characterized in that:
The related news of described multipoint conference control are by the transmission of SIP INFO method, and wherein the content of message body part is used the XML coded system.
10. the method for claim 1 is characterized in that:
Described terminal is based on the terminal of initial session protocol or based on the terminal of agreement H.323, when described multipoint conference control unit and described terminal interaction based on agreement H.323, need finish the conversion between H323 agreement and the initial session protocol form.
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| WO2009132555A1 (en) * | 2008-04-29 | 2009-11-05 | 深圳华为通信技术有限公司 | Video conference implementing method and apparatus |
| CN101986696A (en) * | 2010-11-30 | 2011-03-16 | 上海华平信息技术股份有限公司 | Information transfer equipment and video conference system |
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| CN101986696A (en) * | 2010-11-30 | 2011-03-16 | 上海华平信息技术股份有限公司 | Information transfer equipment and video conference system |
| WO2013029420A1 (en) * | 2011-08-26 | 2013-03-07 | 中兴通讯股份有限公司 | Method for controlling streaming media data of video conference system and system thereof |
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