CN1492682A - Method for transfering meeting control news between cascade multiple ponit control units - Google Patents
Method for transfering meeting control news between cascade multiple ponit control units Download PDFInfo
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- CN1492682A CN1492682A CNA02145969XA CN02145969A CN1492682A CN 1492682 A CN1492682 A CN 1492682A CN A02145969X A CNA02145969X A CN A02145969XA CN 02145969 A CN02145969 A CN 02145969A CN 1492682 A CN1492682 A CN 1492682A
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Abstract
This invention discloses a method for transferring conference control information among cascode multipoint control units including: setting up call connection among MCU and opening the H245 channel, the upper layer applied module sends the conference control information among cascades to the bottom layer of MCU which packages the said information in terms of H245 protocol nonstandard form to be sent to the destination end MCU bottom module by H245 protocol stack via H245 channel, which takes out the content of the control conference information and sends it to the upper-middle applied module of the destination end.
Description
Technical field
The present invention relates to the transmission of messages technology in the video conferencing control system, particularly about the method for meeting control messages between a kind of transmission cascade multipoint control unit (MCU, Multipoint Control Units).
Background technology
In the use of some video conferencing MCU product, need between MCU, transmit the meeting control messages.Though the H245 agreement provides the signaling message that is used for meeting control, and, the message such as request, response, order and indication that this signaling message can pass through H245 are carried out the meeting control, mutual of MCU, but, be not suitable for the complexity that current MCU realizes and control function because the standard signaling type of the meeting control messages that defines is less in the H245 agreement.Therefore, the mode of passing through the standard signaling transmission meeting control messages in the H245 agreement is unfavorable for the expansion of session control function, can not satisfy the requirement of meeting fully.
And, if setting up special socket (Socket) on MCU, employing receives and dispatches cascade MCU message, also will there be many deficiencies.Such as, if use TCP to connect, then can take the Socket resource of MCU, especially many more in cascade quantity, the system resource that takies is also just many more; If use UDP to connect, though can save part Socket resource, because the unreliability of UDP transmission then may cause losing of meeting control messages.Therefore, the mode of this transmission message is also also not fully up to expectations.
Summary of the invention
In view of this, the invention provides a kind of method that transmits the meeting control messages of cascade multipoint control unit, make it can transmit self-defining meeting control messages, and both saved the Socket resource, can guarantee the reliable transmission of meeting message again.
A kind of method that transmits the meeting control messages of cascade multipoint control unit, this method are to realize like this.
A. between the multipoint control unit (MCU) of cascade, set up and call out connection, and open the H245 passage;
The upper application module of B.MCU sends to the meeting control messages between cascade MCU in the H245 protocol stack of local terminal MCU bottom module;
C. the bottom module of local terminal MCU is with the nonstandard message format encapsulation of the meeting control messages between this cascade MCU according to the H245 agreement, and the H245 passage that the H245 protocol stack passes through to open in the steps A again sends to the meeting control messages between packaged cascade MCU the bottom module of destination MCU;
D. the bottom module of destination MCU is received through the meeting control messages between the cascade MCU of encapsulation, takes out meeting control messages content between cascade MCU wherein, and it is handed over the application module at the middle and upper levels to this destination MCU.
Described step C further comprises:
C1. the full content of meeting control messages is inserted in the nonstandard supplemental characteristic field of the nonstandard command messages of H245 agreement in proper order between the cascade MCU that local terminal MCU is received, and the length of current message is inserted in the data byte string length field;
C2. in the aiming field of the nonstandard identifier of the nonstandard parameter of H245 agreement, fill out 0;
C3. in the nonstandard h221 field of the nonstandard identifier of the nonstandard parameter of H245 agreement, insert the ownership vendor code of unique identification MCU equipment.
Described step D further comprises:
D1. destination MCU analyzes the current nonstandard h221 field of receiving through nonstandard identifier in the meeting control messages between the cascade MCU of encapsulation, judges whether two MCU equipment are same type products, if, execution in step D2 then, otherwise, reject;
D2. the content of data field in the nonstandard identifier is all taken out by length;
D3. send the content of taking out to local terminal MCU application layer module at the middle and upper levels.
The ownership vendor code of described MCU equipment comprises national code, extended code and manufacturer's code name of equipment.
The present invention is packaged into the subtended conference control messages of the nonstandard information of H245 by the transmitting-receiving of H245 passage, thereby has realized the effective transmitting-receiving of self-defined meeting control messages between MCU.This method had both been saved the Socket resource, had guaranteed message transmission reliability between MCU again.And scheme is simple, be easy to realize that operation does not increase burden to system.
Description of drawings
Fig. 1 transmits the flow chart of self-defined message for the present invention.
Embodiment
Owing to when video conferencing MCU product carries out cascade, at first will set up a calling between the MCU, and call out the transceiver channel that the H245 control channel of opening just in time can be used as the meeting control messages.Therefore, core content of the present invention is the self-defining meeting control messages of utilizing between the MCU of H245 channel transfer.
Further specify specific embodiments of the present invention below in conjunction with the drawings and specific embodiments.
MCU can comprise upper layer application layer module and bottom module.Upper layer application layer module finished the controlled function of MCU, and the bottom module is finished concrete implementation.Carry out in the actual meeting control procedure at video conferencing MCU product, if this MCU need send the meeting control messages to another MCU, the upper layer application layer module of this MCU will send to cascade MCU meeting control messages the bottom module of local terminal MCU, the bottom module of MCU at first will be packaged into this meeting control messages the nonstandard command messages of H245, and the H245 protocol stack utilizes the H245 passage that the meeting control messages between packaged cascade MCU is sent in the bottom module of opposite end MCU then.Content is taken out in the nonstandard message decapsulation that the bottom module of opposite end MCU will be received, and this content is delivered to local terminal MCU application layer module processing at the middle and upper levels, has promptly finished and has transmitted the meeting control messages between the MCU.
Shown in Figure 1 referring to flow process, for transmitting the process of self-defined message.
Two H245 passages between the MCU are opened in step 101, foundation calling connection between the MCU of cascade;
The bottom module of step 103, local terminal MCU is packaged into the nonstandard command messages of H245 according to the nonstandard command messages form of the meeting control messages between H245 agreement cascade MCU with the meeting control messages between this cascade MCU;
Present embodiment has used the meeting control messages in the H245 agreement, and meeting control messages type definition is as follows:
CommandMessage ::＝CHOICE { nonStandard NonStandardMessage， maintenanceLoopOffCommand MaintenanceLoopOffCommand， sendTerminalCapabilitySet SendTerminalCapabilitySet， encryptionCommand EncryptionCommand， flowControlCommand FlowControlCommand， endSessionCommand EndSessionCommand， miscellaneousCommand MiscellaneousCommand， …， communicationModeCommand CommunicationModeCommand， conferenceCommand ConferenceCommand， h223MultiplexReconfiguration H223MultiplexReconfiguration }，
Wherein, nonstandard parameter (NonStandardParameter) field is defined as follows:
NonStandardParameter::＝SEQUENCE { nonStandardIdentifier NonStandardIdentifier， data OCTET STRING } <!-- SIPO <DP n="4"> --> <dp n="d4"/> NonStandardIdentifier ::＝CHOICE { object OBJECT IDENTIFIER， h221NonStandard H221NonStandard， … } H221NonStandard::＝SEQUENCE {t35CountryCode INTEGER(0..255)，--country，as per T.35 t35Extension INTEGER(0..255)，--assigned nationally manufacturerCode INTEGER(0..65535)，--assigned nationally … }
By above definition as can be seen, the nonstandard type of message that defined of meeting control messages in the H245 agreement.And, nonstandard parameter further comprises the unified null field of (h221NonStandard) of nonstandard data (nonStandardData), nonstandard identifier (NonStandardIdentifier) and nonstandard H221 again, and the eight bit character string of nonstandard data definition (OCTET STRING) is made up of byte serial length and byte serial content.Present embodiment is exactly to utilize defined these null fields in the H245 agreement to realize encapsulating the purpose of nonstandard command messages, and the detailed process of the nonstandard command messages of encapsulation H245 is as follows:
Steps A. whole meeting control messages is all inserted in the byte serial content of nonstandard supplemental characteristic field in proper order, and the length of whole message is inserted in the byte serial length;
Step B. all fills out " 0 " in the aiming field of nonstandard identifier;
Step C. inserts national code, extended code and manufacturer's code name of current device respectively in the nonstandard h221 field of nonstandard identifier, the ownership manufacturer who can unique identification goes out this equipment.
After the bottom module of opposite end MCU was received this H245 message, the detailed process of processing was as follows:
Steps A. analyze the nonstandard h221 field in the nonstandard parameter, after the compare facilities information, confirm whether be same type products, if, then according to identical agreement, execution in step B, otherwise, rejection;
Step B. all takes out the content of data field in the nonstandard parameter by length;
Step C. is with the content of taking out, i.e. meeting control messages is transferred to the upper layer application layer resume module in the local terminal MCU agreement.
The mode that the present invention utilizes the H245 passage to pass through transparent transmission is sent to the opposite end with the meeting control messages between the cascade MCU, because the H245 passage adopts TCP to connect, so the mode of this transmission meeting control messages had both been saved the Socket resource, guaranteed message transmission reliability between MCU again, and technical scheme simple, be easy to realize.
Claims (4)
1, a kind of method that transmits meeting control messages between the cascade multipoint control unit, it is characterized in that: this method may further comprise the steps:
A. between the multipoint control unit (MCU) of cascade, set up and call out connection, and open the H245 passage;
The upper application module of B.MCU sends to the meeting control messages between cascade MCU in the H245 protocol stack of local terminal MCU bottom module;
C. the bottom module of local terminal MCU is with the nonstandard message format encapsulation of the meeting control messages between this cascade MCU according to the H245 agreement, and the H245 passage that the H245 protocol stack passes through to open in the steps A again sends to the meeting control messages between packaged cascade MCU the bottom module of destination MCU;
D. the bottom module of destination MCU is received through the meeting control messages between the cascade MCU of encapsulation, takes out meeting control messages content between cascade MCU wherein, and it is handed over the application module at the middle and upper levels to this destination MCU.
2, method according to claim 1 is characterized in that described step C further comprises:
C1. the full content of meeting control messages is inserted in the nonstandard supplemental characteristic field of the nonstandard command messages of H245 agreement in proper order between the cascade MCU that local terminal MCU is received, and the length of current message is inserted in the data byte string length field;
C2. in the aiming field of the nonstandard identifier of the nonstandard parameter of H245 agreement, fill out 0;
C3. in the nonstandard h221 field of the nonstandard identifier of the nonstandard parameter of H245 agreement, insert the ownership vendor code of unique identification MCU equipment.
3, method according to claim 1 is characterized in that: described step D further comprises:
D1. destination MCU analyzes the current nonstandard h221 field of receiving through nonstandard identifier in the meeting control messages between the cascade MCU of encapsulation, judges whether two MCU equipment are same type products, if, execution in step D2 then, otherwise, reject;
D2. the content of data field in the nonstandard identifier is all taken out by length;
D3. send the content of taking out to local terminal MCU application layer module at the middle and upper levels.
4, method according to claim 2 is characterized in that: the ownership vendor code of described MCU equipment comprises national code, extended code and manufacturer's code name of equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02145969 CN1229995C (en) | 2002-10-25 | 2002-10-25 | Method for transfering meeting control news between cascade multiple ponit control units |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 02145969 CN1229995C (en) | 2002-10-25 | 2002-10-25 | Method for transfering meeting control news between cascade multiple ponit control units |
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| CN1492682A true CN1492682A (en) | 2004-04-28 |
| CN1229995C CN1229995C (en) | 2005-11-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433827C (en) * | 2005-05-18 | 2008-11-12 | 中兴通讯股份有限公司 | Method for making two-stage cascade conference broadcast source consistent under directing mode |
| CN101902347A (en) * | 2010-08-25 | 2010-12-01 | 杭州华三通信技术有限公司 | Anonymous meeting terminal enrollment method and device |
| WO2010142179A1 (en) * | 2009-06-08 | 2010-12-16 | 中兴通讯股份有限公司 | Method and system for implementing large capacity call by using h.323 protocol stack |
-
2002
- 2002-10-25 CN CN 02145969 patent/CN1229995C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433827C (en) * | 2005-05-18 | 2008-11-12 | 中兴通讯股份有限公司 | Method for making two-stage cascade conference broadcast source consistent under directing mode |
| WO2010142179A1 (en) * | 2009-06-08 | 2010-12-16 | 中兴通讯股份有限公司 | Method and system for implementing large capacity call by using h.323 protocol stack |
| US8760491B2 (en) | 2009-06-08 | 2014-06-24 | Zte Corporation | Method and system for implementing large capacity calls by using H.323 protocol stack |
| CN101902347A (en) * | 2010-08-25 | 2010-12-01 | 杭州华三通信技术有限公司 | Anonymous meeting terminal enrollment method and device |
| CN101902347B (en) * | 2010-08-25 | 2013-03-20 | 杭州华三通信技术有限公司 | Anonymous meeting terminal enrollment method and device |
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| Publication number | Publication date |
|---|---|
| CN1229995C (en) | 2005-11-30 |
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