CN101039203A - Access equipment, conference access method and conference service system - Google Patents
Access equipment, conference access method and conference service system Download PDFInfo
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- CN101039203A CN101039203A CN 200710073444 CN200710073444A CN101039203A CN 101039203 A CN101039203 A CN 101039203A CN 200710073444 CN200710073444 CN 200710073444 CN 200710073444 A CN200710073444 A CN 200710073444A CN 101039203 A CN101039203 A CN 101039203A
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Abstract
The invention relates to multimedia conference technology, which solves the problem that the conference business is available only on one application server. The embodiment of the invention provides an access equipment, comprising a receiving unit for receiving the SIP request information sent to the application server by the exchange equipment; a memory unit for storing the corresponding relation between the user information and application server; a judging and inquiring unit for judging whether the received request information belonging to conference business, and determining the application server which is charge of the request information if so; a transmission unit for transmitting the request information to the application server determinated by the judging and inquiring unit. The embodiment of the invention also provides a conference access method and a conference service system. The embodiment of the invention realizes a cluster ability of the conference system with low cost.
Description
Technical field
The present invention relates to the multimedia conferencing technology, particularly relate to a kind of access device, conference access method and conference service system.
Background technology
Session initiation protocol (SIP, Session Initiation Protocol) is the application layer control protocol that on IP network, carries out multimedia communication that the IETF of International Standards Organization proposes, SIP is a client/server agreement, can be used for setting up, revises and termination Multimedia session and calling.
The form of sip request message is as follows: request initial row (Request-Line) begins with method (method) mark, the back is request URI (Request-URI) and protocol version (SIP-Version), finish with enter key at last, use the space bar character pitch between each element.Method (method) is exactly the operation that request is carried out, and SIP comes method is partly done to describe with term " method ", and the method sign is a case sensitive.SIP has defined following several method: invite (INVITE), confirm (ACK), select (OPTIONS), goodbye (BYE), cancel (CANCEL), register (REGISTER), information (INFO), all methods must be capitalized; Request-URI is the current address of invited user, generic resource identifier (URI wherein, Uniform Resource Identifier) is a protocol element of the Internet, can locatees any long-range or local available resources (these resources generally include html document, image, video segment, program etc.) by it.The INFO method is the expansion to Session Initiation Protocol, is used for transmitting the control information relevant with session that session produces, as ISUP and isdn signaling message.
Existing conference system networking structure figure based on Session Initiation Protocol is referring to shown in the accompanying drawing 1:
Conference management terminal 100: by soft switch 200, sip message is sent to application server 300, conference management terminal 100 can be the software that operates in PC, has functions such as conference creation, release and management participant thereof.
Soft switch 200: from the sip message that user terminal and conference management terminal 100 send, take out access code, determine according to access code whether this session belongs to convention business, if then all message with this session all are transmitted to application server 300 processing that loaded convention business.
Application server (AS, Application Server) 300: the IN service that is based on Session Initiation Protocol is carried out platform, can load convention business, finish flow process control, the charging that sip message is handled, meeting is relevant and assist the participant to carry out media negotiation, set up functions such as media channel with the meeting-place.
Media Resource Server (MRS, Media Resource Server) 400: under the control of application server 300, create, discharge the meeting-place resource, create the participant with the media channel between the meeting-place.
Present convention business based on Session Initiation Protocol, all be to adopt above-mentioned this networking structure, all sip messages relevant with meeting all send to an application server processes, realize simple, also make things convenient for the meeting-place to reach resource-sharing alternately, but also therefore convention business can only operate on the single application server, thereby has limited professional expansion, and professional capacity is subject to the disposal ability of single application server.
Summary of the invention
The conference system that the embodiment of the invention provides is based on trunking mode, solved convention business based on Session Initiation Protocol and can only operate in problem on the single application server.
The embodiment of the invention provides a kind of access device, comprising:
Receiving element is used to receive the sip request message that switching equipment sends to application server;
Memory cell is used to preserve the corresponding relation of user profile and application server;
Judge query unit, be used to judge whether the request message that receiving element receives belongs to convention business, if, then according to the user profile that comprises in the described request message, and described memory cell in the user profile of preserving and the corresponding relation of application server, determine the application server that described request message belongs to;
Transmitting element is used for giving the application server of judging that query unit is determined with the described request forwards.
The corresponding relation that described memory cell is preserved is specially: set in advance and preserve at least one application server tabulation, described application server tabulation comprises: current available application server, and the corresponding unique numbering of each application server; And setting in advance at least one user message table, described user message table comprises the application server number information.
Alternatively, described user message table also comprises the use information of application server; The described temporal information of using information to use as the last time.
Described equipment can also comprise updating block, and the last time information renovation that uses of application server that is used for user message table that described judgement query unit is inquired according to user profile is the current time.
Preferably, described equipment also comprises: selected cell, be used for inquiring memory cell when not existing with the corresponding user message table of described user profile when the inquiry subelement, application server of polling comes processes said request message in the application server tabulation of storage; Creating unit, be used for after selecting the unit to select an application server to come processes said request message, create a user message table according to the user profile that comprises in the described request message, the corresponding application server number information is that this is by the application server number information of polling in the table.
The embodiment of the invention also provides a kind of conference access method, and the method comprising the steps of: receive the sip request message that switching equipment sends to application server; Judge when being convention business according to described request message,, determine the application server that described request message belongs to according to the user profile of carrying in the described request message, and the corresponding relation of preset user information and application server; And described request message is sent to this corresponding application server according to the ownership application server of determining.
Described sip request message is the outer SIP initial request message of session.
The described corresponding relation that sets in advance comprises: at least one application server tabulation is set, and described application server tabulation comprises: current available application server, and the corresponding unique numbering of each application server; And at least one user message table is set, described user message table comprises the application server number information.
Alternatively, described user message table also comprises the use information of application server, the described temporal information of using information to use as the last time.
Alternatively, the application service implement body of described definite request message ownership comprises: extract user profile in described request message; The corresponding user message table of user profile that inquires in the stored user information table and extracted is on the application server that the described request forwards is write down in the user message table that inquires.
Alternatively, the application service implement body of described definite request message ownership comprises: extract user profile in described request message; Inquiry is less than with the corresponding user message table of user profile that extracted the time in the stored user information table, application server of polling comes processes said request message in the application server tabulation of storage, and according to the new user message table of user profile establishment that carries in the described request message, the corresponding application server number information is that this is numbered by the application server of polling in the table.
The embodiment of the invention also provides a kind of conference service system, comprise terminal, switching equipment, application server, Media Resource Server, described system also comprises access device, wherein, terminal is used to create sip request message and described message is sent to switching equipment; Switching equipment is used for when described message is convention business described message being sent to application server; Access device is used to receive the sip request message that switching equipment sends to application server, when judgement is convention business, determines the application server of described request message ownership, and described request message is sent to the application server that this is determined; Application server is used for after receiving the request message that access device is sent, and the control Media Resource Server provides convention business.
Preferably, described sip request message is the outer SIP initial request message of session; Described terminal is the conference management terminal, described conference management terminal control convention business, and the user profile in the outer SIP initial request message of all sessions of same meeting in the entrained From header field is identical.
In sum, embodiment of the present invention makes each application server share load equably by a plurality of application server processes convention businesses, alleviated single application server load pressure, improved disposal ability to business.And when a plurality of application server processes convention business, guarantee that still sip messages different in the same meeting all is linked into same application server processes, existing handling process is changed less, realized the clustering capability of conference system with scheme cheaply.
Description of drawings
For the technical scheme and the advantage of technical problem that the present invention is solved, employing are clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention done further elaborating, in each accompanying drawing:
Fig. 1 is based on the conference system networking structure figure of Session Initiation Protocol in the prior art;
Fig. 2 is the structure chart of access device in one embodiment of the invention;
Fig. 3 is the judgement query unit structure chart shown in Fig. 2;
Fig. 4 is the another structure chart of access device in one embodiment of the invention;
Fig. 5 is the flow chart of cut-in method in one embodiment of the invention;
Fig. 6 is the signaling process figure of cut-in method in one embodiment of the invention;
Fig. 7 is a conference service system structure chart in one embodiment of the invention.
Embodiment
Call out if adopt a plurality of application servers to share convention business jointly, handle the ability of convention business improving communication system greatly.The conference management terminal will send to application server by different sip messages for each control operation (as creating the meeting-place, discharge the meeting-place, invite the participant, kicking out of participant etc.) of same meeting, and the data of carrying in the message body of application server according to sip message determine which convention business is this message will control.Because a lot of process datas relevant with same meeting all are kept in the internal memory of same application server, the invention provides following execution mode guarantees in the service environment of a plurality of application servers, the a plurality of separate sip message of controlling same meeting all sends to same application server, thereby guarantee that with less cost sip messages different in the same meeting all is linked into same application server, can not lead to errors because of adopting a plurality of application server processes convention businesses.
An embodiment of the invention are to increase a unified access device in the networking structure of prior art, also can be called access device, the sip request message of being responsible for soft switch is sent to application server is linked into and this sip request message application corresponding server, this request message can be the outer SIP initial request message of session, and this access device selects application server to handle convention business according to the message that receives.The structure of access device is with reference to shown in Figure 2:
Receiving element 501 is used to receive the sip request message that switching equipment sends to application server, and this sip request message can be the outer SIP initial request message of session in the present embodiment;
Judge and further can specifically comprise query unit 502: be used to judge whether request message that receiving element 501 receives belongs to the judgment sub-unit 5021 of convention business with reference to shown in Figure 3; Extract subelement 5022, be used for when judgment sub-unit judges that received request message belongs to convention business, extracting user profile in this request message certainly; Inquiry subelement 5023 be used for inquiring about the corresponding user message table of user profile that whether exists and extracted in memory cell 504, and with Query Result, promptly the application server number information in this user message table is submitted to transmitting element 503.
Transmitting element 503 is used for and will judges that the request message that query unit 502 is determined is transmitted to corresponding application server.
With reference to accompanying drawing 4, access device also comprises:
Updating block 505 is used for inquiring memory cell 504 when having corresponding user message table when inquiry subelement 5023, and the last time information renovation that uses in this table is the current time;
Selected cell 506 is used for inquiring memory cell 504 when not having corresponding user message table when inquiry subelement 5023, and application server of polling is handled request message in the application server tabulation of storage;
Creating unit 507, be used for after selecting unit 506 to select an application server to handle this request message, create a user message table according to user information corresponding, the corresponding application server number information is that this is by the application server number information of polling in the table, the use information that also comprises application server in the user message table of creating, this uses information can be the last temporal information of using of application server, writes down the temporal information of current time for the last use here.
Another embodiment of the present invention provides a kind of conference access method, and referring to Fig. 5, the concrete processing procedure of this method is as follows:
Set in advance the corresponding relation of user profile and application server, this corresponding relation can comprise: at least one application server tabulation is set, described application server tabulation comprises: current available application server, and the corresponding unique numbering of each application server; And at least one user message table is set, user message table comprise with the application server tabulation in consistent application server number information and the use information of application server numbering, this uses information can be the temporal information of the last time use.
S802: access device receives the sip request message that switching equipment sends to application server, herein can be for the outer SIP initial request message of session, as creating the MESSAGE or the INFO in meeting-place;
S804: judgement is that convention business enters step S806 afterwards, specifically judge whether for the process of convention business can for: the request message that access device receives is MESSAGE or INFO, and the access code that takes out from Request-URI is the access code of convention business.
S806: determine the application server that this request message should insert, i.e. the application server of this message ownership; Be specially: access device extracts user profile in the SIP initial request message outside session, whether inquiry exists and the corresponding user message table of user profile that is extracted in the stored user information table, if exist, then this request message is forwarded on the application server of record in this table, and the time information renovation that the last time in will showing uses is the current time; If there is no, then application server of polling is handled this request message in the application server tabulation of storage, and according to new user message table of user information corresponding establishment, the corresponding application server number information is that this is by the application server number information of polling in the table, the use information that also comprises application server in the user message table of creating, this uses information can be the last temporal information of using of application server, writes down the temporal information of current time for the last use here.
S808: this request message is sent to the ownership application server that this is determined.
This method embodiment is by conference management terminal control convention business, and the user profile in the outer request message of all sessions of a same conference in the entrained From header field is identical.
The another embodiment of this method can be described below, with reference to shown in Figure 6:
Conference management terminal or user terminal are created the MESSAGE or the INFO in meeting-place, send to switching equipment, for example Softswitch; Carried the authentication information of this conference management terminal in this message body, and a plurality of property values in this meeting-place, and need application server initiatively to draw in participant's information in meeting-place.
Soft switch is obtained access code from this message, determine that according to this access code this business is convention business, sends to access device with this message again;
After access device receives this message, if this request message is MESSAGE or INFO, and the access code that takes out from Request-URI is the access code of convention business, then can determine the message that is used to control certain meeting that conference management terminal or user terminal send, judge further then, confirm that the application server under this message is numbered;
The process of judging, confirm the application server numbering that this message is affiliated is as follows: access device sets in advance and preserves the tabulation of current available application services device, all corresponding unique numbering of each available application server.Also be provided with and preserve a user profile userinfo table in addition, the KEY key assignments of each list item is the userinfo part of the From header field of the outer request message of session, and value comprises two fields: application server numbering, last or the last time of using.Access device takes out the userinfo part from the From header field of this request message, in user message table, inquire about whether there is corresponding list item with this as key assignments: if exist, then this request message is forwarded on the application server that writes down in this list item, and is set to the current time the last service time in this list item; If there is no, then application server of polling is handled request message outside this session from the tabulation of available application services device, and create a new user profile userinfo and show, do key assignments with this userinfo, and application server among the value is set is numbered selected application server numbering, the current time is set is the last time of using.
After application server 1 is received this request message, also can carry out authentication again, after authentication was passed through, control Media Resource Server MRS created the meeting-place, sets up the participant with the media channel between the meeting-place; Return the 200 OK response messages of INFO to the conference management terminal; Can carry the meeting-place ID of new establishment in this message body.The request message that application server is received is if INVITE, then in corresponding response message, add Contact header field, in Contact header field, fill in the IP address and the port numbers of current application server reception sip message, then response message is sent to Softswitch, make the subsequent message of this SIP dialog all directly send to current application server, no longer need to transmit through access device by Softswitch; And the sip message that application server sends can directly be issued Softswitch, no longer passes through access device.
After meeting termination or the end, the conference management terminal sends the INFO that discharges the meeting-place to application server 1; Application server 1 control MRS discharges the meeting-place resource; Application server 1 returns the 200 OK response messages of INFO to the conference management terminal.
Can guarantee to support jointly in the environment of convention business that all control messages of same meeting all are transmitted to same application server processes at a plurality of application servers by such scheme.By the way of polling, realize that each application server can bear traffic load equably; Polling can be to select in turn, for example select present load amount minimum in current available application server tabulation one.
Present embodiment has been realized the trunking mode of conference system, has solved conference system based on Session Initiation Protocol and can only operate in problem on the single AS.
Another embodiment of the present invention provides a kind of conference service system that increases above-mentioned access device, referring to Fig. 7, this system comprises conference management terminal 100, switching equipment, Media Resource Server 400, application server 300 and access device 500, switching equipment is generally soft switch 200 in the NGN network, access device 500 is used to receive the outer SIP initial request message of session that switching equipment sends to application server 300, judge if convention business, then determine the application server of request message ownership, and this message is sent to this application server.Wherein the concrete effect of the concrete composition structure of access device 500 and each part thereof elaborates above-mentioned, no longer too much gives unnecessary details here.
Terminal is used to create sip request message and described message is sent to switching equipment; Can be conference management terminal 100 in the present embodiment;
Switching equipment can be soft switch 200 in the present embodiment, is used for when described message is convention business described message being sent to application server 300;
Between switching equipment and the access device 500, between application server 300 and the Media Resource Server 400 by UDP carrying sip message; By any protocol transmission message, this transmission means can be a proprietary protocol between access device 500 and the application server 300.
In sum, embodiments of the present invention propose to may operate in a plurality of application servers based on the convention business of Session Initiation Protocol, make each application server can share load equably, and solved in the service environment of a plurality of application servers, realize that the various SIP message of same meeting is linked into the scheme of same application server, realized the clustering capability of conference system with scheme cheaply.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (25)
1, a kind of access device is characterized in that, comprising:
Receiving element is used to receive the sip request message that switching equipment sends to application server;
Memory cell is used to preserve the corresponding relation of user profile and application server;
Judge query unit, be used to judge whether the request message that receiving element receives belongs to convention business, if, then according to the user profile that comprises in the described request message, and described memory cell in the user profile of preserving and the corresponding relation of application server, determine the application server that described request message belongs to;
Transmitting element is used for giving the application server of judging that query unit is determined with the described request forwards.
2, equipment as claimed in claim 1, it is characterized in that, the corresponding relation that described memory cell is preserved is specially: set in advance and preserve at least one application server tabulation, described application server tabulation comprises: current available application server, and the corresponding unique numbering of each application server; And setting in advance at least one user message table, described user message table comprises the application server number information.
3, equipment as claimed in claim 2 is characterized in that, described user message table also comprises the use information of application server.
4, equipment as claimed in claim 3 is characterized in that, the described temporal information of using information to use as the last time.
5, equipment as claimed in claim 2 is characterized in that, described judgement query unit specifically comprises:
Judgment sub-unit is used to judge whether received request message belongs to convention business;
Extract subelement, be used for when judgment sub-unit judges that received request message belongs to convention business, in described request message, extracting user profile;
The inquiry subelement is used for inquiring about the corresponding user message table of user profile that memory cell and described extraction subelement are extracted, and determines the application server of described request message ownership according to the application server number information in this user message table.
6, equipment as claimed in claim 4 is characterized in that, also comprises:
Updating block, the last time information renovation that uses of application server that is used for user message table that described judgement query unit is inquired according to user profile is the current time.
7, equipment as claimed in claim 5 is characterized in that, also comprises:
Selected cell is used for inquiring memory cell when not existing with the corresponding user message table of described user profile when the inquiry subelement, and application server of polling comes processes said request message in the application server tabulation of storage;
Creating unit, be used for after selecting the unit to select an application server to come processes said request message, create a user message table according to the user profile that comprises in the described request message, the corresponding application server number information is that this is by the application server number information of polling in the table.
8, equipment as claimed in claim 7 is characterized in that, also comprises the use information of application server in the user message table that described creating unit is created, the described temporal information of using information to use as the last time.
9, a kind of conference access method is characterized in that, comprises step:
Receive the sip request message that switching equipment sends to application server;
Judge when being convention business according to described request message,, determine the application server that described request message belongs to according to the user profile of carrying in the described request message, and the corresponding relation of preset user information and application server; And
According to the ownership application server of determining described request message is sent to this corresponding application server.
10, method as claimed in claim 9 is characterized in that, described sip request message is the outer SIP initial request message of session.
11, method as claimed in claim 9, it is characterized in that, the described corresponding relation that sets in advance comprises: at least one application server tabulation is set, and described application server tabulation comprises: current available application server, and the corresponding unique numbering of each application server; And at least one user message table is set, described user message table comprises the application server number information.
12, method as claimed in claim 11 is characterized in that, described user message table also comprises the use information of application server, the described temporal information of using information to use as the last time.
13, method as claimed in claim 11 is characterized in that, the application service implement body of described definite request message ownership comprises:
In described request message, extract user profile;
The corresponding user message table of user profile that inquires in the stored user information table and extracted is on the application server that the described request forwards is write down in the user message table that inquires.
14, method as claimed in claim 11 is characterized in that, the application service implement body of described definite request message ownership comprises:
In described request message, extract user profile;
Inquiry is less than with the corresponding user message table of user profile that extracted the time in the stored user information table, application server of polling comes processes said request message in the application server tabulation of storage, and according to the new user message table of user profile establishment that carries in the described request message, the corresponding application server number information is that this is by the application server number information of polling in the table.
15, method as claimed in claim 14 is characterized in that, also comprises the use information of application server in the new user message table of described establishment, the described temporal information of using information to use as the last time.
16, method as claimed in claim 9 is characterized in that, described judgement is that the process of convention business specifically comprises:
The described request message that receives is MESSAGE or INFO, and the access code that takes out from Request-URI is the access code of convention business.
17, a kind of conference service system comprises terminal, switching equipment, application server, Media Resource Server, it is characterized in that, described system also comprises access device, wherein,
Terminal is used to create sip request message and described message is sent to switching equipment;
Switching equipment is used for when described message is convention business described message being sent to application server;
Access device is used to receive the sip request message that switching equipment sends to application server, when judgement is convention business, determines the application server of described request message ownership, and described request message is sent to the application server that this is determined;
Application server is used for after receiving the request message that access device is sent, and the control Media Resource Server provides convention business.
18, system as claimed in claim 17 is characterized in that, described access device further comprises:
Receiving element is used to receive the sip request message that switching equipment sends to application server;
Memory cell is used to preserve the corresponding relation of user profile and application server;
Judge query unit, be used to judge whether the request message that receiving element receives belongs to convention business, if, then according to the user profile that comprises in the described request message, and described memory cell in the user profile of preserving and the corresponding relation of application server, determine the application server that described request message belongs to;
Transmitting element is used for giving the application server of judging that query unit is determined with the described request forwards.
19, system as claimed in claim 18, it is characterized in that, the corresponding relation that described memory cell is preserved is specially: set in advance and preserve at least one application server tabulation, described application server tabulation comprises: current available application server, and the corresponding unique numbering of each application server; And setting in advance at least one user message table, described user message table comprises the application server number information.
20, system as claimed in claim 19 is characterized in that, described user message table also comprises the use information of application server, the described temporal information of using information to use as the last time.
21, system as claimed in claim 18 is characterized in that, described judgement query unit specifically comprises:
Judgment sub-unit is used to judge whether received request message belongs to convention business;
Extract subelement, be used for when judgment sub-unit judges that received request message belongs to convention business, in described request message, extracting user profile;
The inquiry subelement is used for inquiring about the corresponding user message table of user profile that memory cell and described extraction subelement are extracted, and determines the application server of described request message ownership according to the application server number information in this user message table.
22, system as claimed in claim 20 is characterized in that, described access device also comprises:
Updating block, the last time information renovation that uses of application server that is used for user message table that described judgement query unit is inquired according to user profile is the current time.
23, system as claimed in claim 21 is characterized in that, described access device also comprises:
Selected cell is used for inquiring memory cell when not existing with the corresponding user message table of described user profile when the inquiry subelement, and application server of polling comes processes said request message in the application server tabulation of storage;
Creating unit, be used for after selecting the unit to select an application server to come processes said request message, create a user message table according to the user profile that comprises in the described request message, the corresponding application server number information is that this is by the application server number information of polling in the table.
24, system as claimed in claim 23 is characterized in that, also comprises the use information of application server in the user message table that described creating unit is created, the described temporal information of using information to use as the last time.
25, as the arbitrary described system of claim 17 to 20, it is characterized in that,
Described sip request message is the outer SIP initial request message of session;
Described terminal is the conference management terminal, described conference management terminal control convention business, and the user profile in the outer SIP initial request message of all sessions of same meeting in the entrained From header field is identical.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009049505A1 (en) * | 2007-10-18 | 2009-04-23 | Huawei Technologies Co., Ltd. | Video conference method and system, application server and media resource server |
| CN101815067A (en) * | 2010-03-08 | 2010-08-25 | 中兴通讯股份有限公司 | Multimedia conference realization method and system |
| CN101159787B (en) * | 2007-11-07 | 2010-10-13 | 中兴通讯股份有限公司 | Soft switching communication system and method of implementing session service |
| CN101159924B (en) * | 2007-11-16 | 2011-04-20 | 华为软件技术有限公司 | Method and device for providing user information |
| CN102882808A (en) * | 2012-10-12 | 2013-01-16 | 武汉钢铁(集团)公司 | IP (Internet Protocol) dispatching method an IP dispatching system realized by expanding SIP (Session Initiation Protocol) protocol |
| CN101902455B (en) * | 2010-01-12 | 2013-10-16 | 北京邮电大学 | Open multimedia conference service system and implementing method thereof |
| CN105933132A (en) * | 2016-07-13 | 2016-09-07 | 国网江苏省电力公司信息通信分公司 | Video conferencing system intelligent control key technology |
| CN107204862A (en) * | 2016-03-17 | 2017-09-26 | 株式会社理光 | Conference system, connection control device and connection control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009049505A1 (en) * | 2007-10-18 | 2009-04-23 | Huawei Technologies Co., Ltd. | Video conference method and system, application server and media resource server |
| CN101159787B (en) * | 2007-11-07 | 2010-10-13 | 中兴通讯股份有限公司 | Soft switching communication system and method of implementing session service |
| CN101159924B (en) * | 2007-11-16 | 2011-04-20 | 华为软件技术有限公司 | Method and device for providing user information |
| CN101902455B (en) * | 2010-01-12 | 2013-10-16 | 北京邮电大学 | Open multimedia conference service system and implementing method thereof |
| CN101815067A (en) * | 2010-03-08 | 2010-08-25 | 中兴通讯股份有限公司 | Multimedia conference realization method and system |
| WO2011109972A1 (en) * | 2010-03-08 | 2011-09-15 | 中兴通讯股份有限公司 | Method and system for implementing multimedia conference |
| CN101815067B (en) * | 2010-03-08 | 2014-09-10 | 中兴通讯股份有限公司 | Multimedia conference realization method and system |
| CN102882808A (en) * | 2012-10-12 | 2013-01-16 | 武汉钢铁(集团)公司 | IP (Internet Protocol) dispatching method an IP dispatching system realized by expanding SIP (Session Initiation Protocol) protocol |
| CN102882808B (en) * | 2012-10-12 | 2015-04-29 | 武汉钢铁(集团)公司 | IP (Internet Protocol) dispatching method an IP dispatching system realized by expanding SIP (Session Initiation Protocol) protocol |
| CN107204862A (en) * | 2016-03-17 | 2017-09-26 | 株式会社理光 | Conference system, connection control device and connection control method |
| CN105933132A (en) * | 2016-07-13 | 2016-09-07 | 国网江苏省电力公司信息通信分公司 | Video conferencing system intelligent control key technology |
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| CN100484013C (en) | 2009-04-29 |
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