CN100589658C - Multimedia communication session establishing method - Google Patents
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- CN100589658C CN100589658C CN200610059057A CN200610059057A CN100589658C CN 100589658 C CN100589658 C CN 100589658C CN 200610059057 A CN200610059057 A CN 200610059057A CN 200610059057 A CN200610059057 A CN 200610059057A CN 100589658 C CN100589658 C CN 100589658C
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Abstract
The method includes steps: based on request for building session sent by user to build one or more sessions in advance between the user and session server; negotiated session capability attribute of the built session in advance is inactive; after receiving request for building service sent from user participating in the session, the session server establishes actual session based on selection information carried by the request for building service, and session built in advance; in procedure for establishing actual session, modifying negotiated session capability attribute of the built sessionto active. Using the method can select needed session from composite session built in advance or multiple sessions to establish actual session and modify the session built in advance.
Description
Technical field
The present invention relates to network communication field, relate in particular to a kind of multimedia communication session establishing method.
Background technology
Along with the development of broadband network, mobile communication will not only be confined to traditional Speech Communication, will carry out gradually in conjunction with the multimedia service of multiple medium types such as audio frequency, video, picture and text.Data services such as this multimedia service can be browsed with presence (presenting business), short message, WEB (webpage), locating information, PUSH (pushing professional) and file-sharing combine, and provide the multiple business service to the user.This multiple business service comprises:
Messaging service: instant message and chatroom, multimedia short message etc.
Video traffic: amusement, multimedia messages, daily interchange etc.
Ecommerce: catalogue, search engine, shopping cart, order management, payment etc.
Recreation: solitaire game, group's recreation etc.
Positioning service: missing, guide, warning etc.
Personal assistant: address book, schedule, bookmark management, file storage, event notification, Email etc.
Under the promotion that above-mentioned multiple business service is used, 3GPP (third generation partnership project) normal structure has been released IP-based IMS (internet multimedia subsystem) framework, purpose is to use a kind of structure of standardized opening to realize diversified multimedia application in communication network, offers more selection of user and abundanter impression.
Along with development of internet technology, multi-party communication becomes a kind of general gradually business, in order to realize that multi-party communication must need a unified control point and come system is managed, and need guarantee the consistency and the real-time of managing.Such as, when a user applies sent voice data, system needed and can only have a control point that this application is handled.Present multimedia communications system in many ways comprises systems such as PoC (based on the press-and-talk of honeycomb) system, Conference (multimedia conferencing) system.Wherein the PoC system is a kind of central controlled multimedia communications system in many ways.
Set up speed in order to improve session, prior art provides session pre-established method, promptly sets up session, consulting session parameter in advance.The follow-up session parameter of this negotiation that directly utilizes is set up actual session, can accelerate session like this and set up speed.
Actual session method for building up after session in the multimedia communications system of the prior art is pre-established is: set up session in advance, after having consulted session parameter in advance, when setting up actual session, conversation server and user can only carry out according to the session parameter of consulting in advance, can not carry out other selection.The schematic diagram of the actual session method for building up after this session is pre-established as shown in Figure 1.
The shortcoming of the actual session method for building up after above-mentioned session of the prior art is pre-established is: in actual applications, pre-established session and actual session are set up has the bigger time interval, the user has just carried out resource reservation in the pre-established stage, this can waste more resource, and under the situation of supporting Multimedia session, the user needs the selection that polytype session is set up, the actual session of the follow-up foundation of user can only be identical with pre-established a kind of session, do not satisfy the demand that user flexibility is set up session.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of multimedia communication session establishing method, thereby can be implemented in advance the session of need selecting in the sessions such as the composite session set up or a plurality of sessions and set up actual session, the session of setting up is in advance made amendment.
The objective of the invention is to be achieved through the following technical solutions:
A kind of multimedia communication session establishing method comprises step:
According to the pre-established request of session that the user sends, between this user and conversation server, set up one or more pre-established sessions in advance, the session ability attribute that this pre-established session is consulted is an inertia;
After this conversation server receives that actual session that session participating user sends is set up request, set up selection information and this pre-established session of carrying in the request according to this actual session and set up actual session, and be activity this session ability attribute modification.
Wherein, this is set up one or more pre-established sessions in advance and specifically comprises according to the pre-established request of session that the user sends between this user and conversation server:
This conversation server receives that the user sends sets up and one or morely carries the pre-established request of session that session ability requires or send a pre-established request of session of having carried a plurality of session abilities, and the session ability attribute of wherein being asked is an inertia;
This conversation server gives this session pre-established request assign sessions sign, according to subscription data the Session Description Protocol SDP parameter of carrying in the pre-established request of this session is adjudicated simultaneously, gives the SDP parameter of the pre-established request selective system permission of this session;
Conversation server sends the pre-established response of session of the session identification that carries this distribution to the pre-established requesting users of this transmission session, and SDP parameter, the session identification consulted are preserved.
Wherein, this conversation server also comprises after the pre-established requesting users of this transmission session sends the pre-established response of session of the session identification that carries this distribution:
The pre-established requesting users of this transmission session is set up carrying according to the SDP parameter of being consulted.
Wherein, this conversation server also comprises after the pre-established requesting users of this transmission session sends the pre-established response of session of the session identification that carries this distribution:
In the IP Multimedia System IMS system of support policy control, after the entity among the IMS receives that response is set up in the session of conversation server transmission, set up sign Token to policy selection function PDF request carrying, set up the Token that has increased access in the response in this session, response is set up in this session send to the pre-established requesting users of this transmission session.
Wherein, should set up the Token that have increased access in the response, this session was set up after response sends to the pre-established requesting users of this transmission session, also comprise in session:
The Token that the pre-established requesting users utilization of this transmission session is obtained sets up carrying.
Wherein, the pre-established requesting users of this transmission session is specially according to the carrying of the SDP parameter foundation of being consulted:
In Wideband Code Division Multiple Access (WCDMA) WCDMA system, be the packet data protocol PDP connection of bearer service; In cdma system, be the point-to-point PPP connection or the example of bearer service.
Session parameter in the SDP parameter of wherein, being somebody's turn to do comprises that session level is described, regularly description and medium type and format description.
Wherein, this, also comprises after setting up one or more pre-established sessions between this user and the conversation server in advance according to the pre-established request of session that the user sends:
The session updates request of carrying session label information and SDP information that the user that this conversation server receives session pre-established sends, in the session that this is set up in advance, obtain with this session updates request in the corresponding session of session identification of carrying;
This conversation server is held consultation the SDP information of carrying in this session updates request with the SDP information and the subscription data of this corresponding session, this corresponding session is made amendment;
Send the session updates requesting users to this and send the session updates response.
Wherein, deserve after actual session that this conversation server receives that session participating user sends sets up request, set up selection information and this pre-established session of carrying in the request according to this actual session and set up actual session, and be that activity specifically comprises this session ability attribute modification:
This conversation server is received other user's of invitation who carries session identification and/or SDP sign that the user of pre-established session sends actual session foundation request, conversation server is according to this session identification that carries and/or SDP sign, from this user select corresponding session and SDP information the pre-established session;
This conversation server utilizes the SDP information of this selection to constitute session and sets up message, message is set up in this session sent to the user who is invited, and set up requesting users transmission acknowledge message to this transmission actual session;
After this conversation server was received replying that this user who is invited returns, conversation server was set up requesting users to this transmission actual session and is sent the connection request message of carrying session identification.
Wherein, deserve after actual session that this conversation server receives that session participating user sends sets up request, set up selection information and this pre-established session of carrying in the request according to this actual session and set up actual session, and be that activity also comprises this session ability attribute modification:
If this transmission actual session is set up requesting users and do not set up carrying, this user sets up carrying.
Wherein, after the session updates request of carrying session label information and SDP information that the user that this conversation server receives session pre-established sends, also comprise:
The user of this conversation server or this pre-established session initiates renewal process, is active state with this session ability attribute modification.
Wherein, deserve after actual session that this conversation server receives that session participating user sends sets up request, set up selection information and this pre-established session of carrying in the request according to this actual session and set up actual session, and be that activity specifically comprises this session ability attribute modification:
After this conversation server receives that actual session that the user of non-pre-established session sends is set up request, this actual session set up the SDP information of carrying in the request with the SDP information of pre-established session mate;
This conversation server obtains in the SDP of this pre-established session information sets up the medium type of the SDP information of carrying in the request with this actual session and/or media capability information equates or SDP information of equal value, equate or the corresponding session of SDP Information Selection of equal value according to this, and set up requesting users transmission response message to this transmission actual session;
This conversation server sends update request for the user of pre-established session, and the user of this conversation server or this pre-established session initiates renewal process, is active state with this session ability attribute modification.
Wherein, this is set up requesting users and sends response message and be specially to sending actual session:
Set up the notification message that session identification is carried in the requesting users transmission to sending actual session; Perhaps,
Set up the notification message that session identification and this SDP message identification are carried in the requesting users transmission to sending actual session.
Wherein, this conversation server is access server or centralized control server.
Wherein, in the press-and-talk PoC system based on honeycomb, this conversation server is the PoC server of execution control function or carries out the PoC server that participates in function.
As seen from the above technical solution provided by the invention, the present invention is by setting up sessions such as composite session or a plurality of sessions in advance between calling subscriber and the conversation server, the calling subscriber applies for request again to conversation server transmission session updates request or session, can realize the session of setting up is in advance made amendment.When setting up actual session, according to calling subscriber or called subscriber's request, actual session is set up in the session that can need select neatly in sessions such as the composite session of setting up in advance or a plurality of sessions.Can support Multimedia session better, solve the problems of the prior art effectively.
Description of drawings
Fig. 1 is the schematic diagram of the actual session method for building up of session of the prior art after pre-established;
Fig. 2 is the concrete process chart of the embodiment of the method for the invention;
The schematic diagram of Fig. 3 for setting up session in advance and the session of setting up is in advance made amendment between calling subscriber and the server;
Fig. 4 is for setting up the schematic diagram of the composite session that comprises a plurality of parametric degrees in advance between conversation server and the calling subscriber;
Fig. 5 is for setting up the schematic diagram of a plurality of sessions in advance between conversation server and the calling subscriber;
Fig. 6 sets up request for the actual session of having carried session id that sends according to the calling subscriber, and conversation server is set up the schematic diagram of actual session;
Fig. 7 sets up the schematic diagram of actual session for when having set up composite session in advance between calling subscriber and the conversation server according to called subscriber's request;
Fig. 8 sets up the schematic diagram of actual session for when having set up one or more non-composite session between calling subscriber and the conversation server in advance according to called subscriber's request;
Fig. 9 is the flow chart under a kind of resource management scheme of policy control;
Figure 10 is the flow chart under the resource management scheme of another kind of policy control;
Figure 11 is the flow chart under a kind of resource management scheme that does not have a policy control;
Figure 12 is the flow chart under the resource management scheme of another kind of no policy control;
Figure 13 is the pre-established overall process schematic diagram of calling and called under the resource management scheme of policy control;
Figure 14 is the pre-established overall process schematic diagram of calling and called under the resource management scheme of no policy control.
Embodiment
The invention provides a kind of multimedia communication session establishing method, core of the present invention is: set up sessions such as composite session or a plurality of sessions between calling subscriber and the conversation server in advance, and as required the session of setting up is in advance made amendment.When setting up actual session, actual session is set up in the session of need selecting in sessions such as the composite session of setting up in advance or a plurality of sessions.
Describe the method for the invention in detail below in conjunction with accompanying drawing, the concrete handling process of the embodiment of the method for the invention comprises the steps: as shown in Figure 2
Step 2-1, calling subscriber and conversation server between set up composite session or a plurality of session in advance, and, the session of setting up is in advance made amendment by carrying out interacting message with conversation server.
The calling subscriber at first sends the pre-established request of session to conversation server, the pre-established request of this session can be one or more pre-established requests of session of carrying the session ability requirement, perhaps, the pre-established request of session of having carried a plurality of session abilities, the session ability attribute of wherein being asked is Inactive (inertia), i.e. inactive state.
After conversation server receives the pre-established request of described session, distribute corresponding session id (session identification) for the pre-established request of this session, according to subscription data SDP (Session Description Protocol) parameter of carrying in the pre-established request of this session is adjudicated simultaneously, give the SDP parameter of the pre-established request selective system permission of this session.Session parameter in the described SDP parameter comprises that session level is described, regularly description and medium type and format description.
Conversation server distributes a plurality of SDP parametric degrees can for the above-mentioned pre-established request of session of having carried a plurality of session abilities, such as, distribute SDP1 parametric degree, SDP2 parametric degree and SDP3 parametric degree.Promptly set up composite session in advance.The schematic diagram of setting up the composite session comprise a plurality of parametric degrees between above-mentioned conversation server and the calling subscriber in advance as shown in Figure 3.
Conversation server all distributes corresponding SDP parametric degree can for above-mentioned one or more pre-established requests of session of carrying the session ability requirement, so, just set up a plurality of sessions between conversation server and the calling subscriber in advance.The schematic diagram of setting up a plurality of sessions between above-mentioned conversation server and the calling subscriber in advance as shown in Figure 4.
Then, the pre-established response of session that conversation server carries the session identification of described distribution to the pre-established requesting users transmission of described transmission session, and SDP parameter, the session identification of the session that will set up in advance and negotiation are preserved.
In IMS (IP Multimedia System) system of support policy control, after the entity among the IMS receives that response is set up in the session of conversation server transmission, to PDF (policy selection function) request Token (sign is set up in carrying), after the Token that has increased access in the response is set up in described session, response is set up in this session send to the pre-established requesting users of described transmission session.This user can utilize the Token that is obtained to set up carrying after receiving that response is set up in described session of having carried Token immediately; Set up carrying when perhaps, needing to use business afterwards.
In WCDMA (Wideband Code Division Multiple Access (WCDMA)) system, the above-mentioned PDP (packet data protocol) that is carried as bearer service connects; In CDMA (code division multiple access) system, the above-mentioned PPP (point-to-point protocol) that is carried as bearer service connects or example.
Before setting up actual session, the calling subscriber can be by sending update (session updates request) or the reinvite (request is applied in session again) that carries sessionid and SDP information to conversation server.After conversation server is received this update or reinvite, the session of the session id correspondence of wherein carrying is made amendment, the content of modification comprises media capability parameter in the above-mentioned session parameter, address information etc.Then, conversation server returns session updates response or response is applied in session again to the calling subscriber.
The schematic diagram of setting up session between above-mentioned calling subscriber and the server in advance and the session of setting up in advance being made amendment as shown in Figure 5.
When moving SIP (Session initiation Protocol) agreement between calling subscriber and the conversation server, response of the pre-established response of above-mentioned session, session updates and session are applied for again responding etc. and can be realized by No. 200 message of Session Initiation Protocol.
Step 2-2, when setting up actual session, calling subscriber or called subscriber send the actual session of carrying session id, SDP parametric degree information to conversation server and set up request, the session information that conversation server is set up accordingly in advance according to this session id, SDP parametric degree Information Selection, and handle accordingly.
When setting up actual session, set up request according to the actual session that the user of pre-established session sends, the process of setting up actual session comprises the steps:
The user of step 1, pre-established session sends other user's of invitation who carries session identification and SDP sign actual session foundation request to the conversation server at its place, conversation server is selected corresponding session and SDP information according to this session identification that carries and SDP sign from this pre-established session of user institute.
In this step, described conversation server can be initiated renewal process, and the inactive state of the SDP information of described selection is revised as active state.If when the user of described pre-established session did not set up carrying, this user can set up carrying.In the IMS system of described support policy control, if the user of described pre-established session does not set up when carrying, this user can utilize the Token that is obtained to set up carrying.
Step 2, conversation server utilize the SDP information of described selection to constitute session and set up message, message is set up in this session sent to the user who is invited, and the calling subscriber to described pre-established session sends acknowledge message simultaneously.
In this step, the calling subscriber of described conversation server or described pre-established session can initiate renewal process, and the inactive state of the SDP information of described selection is revised as active state.If when the user of described pre-established session did not set up carrying, this user can set up carrying.In the IMS system of described support policy control, if the user of described pre-established session does not set up when carrying, this user can utilize the Token that is obtained to set up carrying.
Step 3, after described conversation server is received replying that the described user who is invited returns, conversation server sends the connection request message of carrying session identification for the calling subscriber of described pre-established session.
In this step, in the IMS system of described support policy control, after the entity in the described IMS system is received the response message that described conversation server sends, to the PDF request authorization resources usage license, after the resource usage license that obtains PDF, notify the calling subscriber of described pre-established session can use the resource of having distributed.
The above-mentioned actual session of having carried session id that sends according to the calling subscriber is set up request, and the schematic diagram that conversation server is set up actual session as shown in Figure 6.
When setting up actual session, set up request according to the actual session that other users send, the process of setting up actual session comprises the steps:
Step 1, when setting up actual session, after the conversation server at the user place of pre-established session receives that actual session that other users send is set up request, this actual session set up the SDP information of carrying in the request and this pre-established session the user the SDP information of pre-established session mate.
Step 2, described conversation server obtain in the SDP of described pre-established session information sets up the medium type of the SDP information of carrying in the request with described actual session and media capability information equates or SDP information of equal value, equate or the corresponding session of SDP Information Selection of equal value according to this, and set up requesting users transmission response message to described transmission actual session.
In this step, if the user of described pre-established session does not set up when carrying, this user can set up carrying.In the IMS system of described support policy control, if the user of described pre-established session does not set up when carrying, this user can utilize the Token that is obtained to set up carrying.
In this step, set up when the medium type of the SDP of described pre-established session information and media capability information and described actual session that the medium type of SDP information of request and media capability information equate or of equal value, then conversation server is replied according to the SDP information of this pre-established session, sends the notification message that carries session identification and sets up requesting users to described transmission actual session;
Perhaps,
Medium type in a SDP information in the SDP of the described pre-established session information sets and media capability information and described actual session are set up that the medium type of SDP information of request and media capability information equate or are of equal value, then conversation server is replied according to the SDP information of this pre-established session, sends the notification message that carries session identification and this SDP message identification and sets up requesting users to described transmission actual session.
Step 3, described conversation server send update request for the user of described pre-established session, the user of described conversation server or described pre-established session initiates renewal process, equates or the inactive state of SDP information of equal value is revised as active state described.
Above-mentioned when having set up composite session in advance between calling subscriber and the conversation server, the schematic diagram of setting up actual session according to called subscriber's request as shown in Figure 7.Above-mentioned when having set up one or more non-composite session between calling subscriber and the conversation server in advance, the schematic diagram of setting up actual session according to called subscriber's request as shown in Figure 8.
In this step, in the IMS system of described support policy control, described conversation server carries out the application of resource use authority to PDF to the session of described selection, after the mandate of acquisition PDF, sends and carries the user of the connection request of session identification to this pre-established session.
Above-mentioned based on the flow chart under the resource management scheme of policy control such as Fig. 9 and shown in Figure 10.Based on all pre-established overall process schematic diagram of calling and called under the resource management scheme of policy control as shown in figure 13.
When not having policy control, then the resource of user applies can directly be used by the user, does not need to control by PDF.The time that carrying is set up also can be selected.The time of the inactive state of SDP information being revised as active state also can be selected, and also can be initiated by user or server.
Above-mentioned based on the flow chart under the resource management scheme of no policy control such as Figure 11 and shown in Figure 12.Based on all pre-established overall process schematic diagram of calling and called under the resource management scheme of no policy control as shown in figure 14.
The described method of the invention described above is applicable to system such as multimedia communications system in many ways.
The described conversation server of the invention described above can be access server or centralized control server, and in the press-and-talk PoC system based on honeycomb, described conversation server is the PoC server of execution control function or carries out the PoC server that participates in function.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (15)
1, a kind of multimedia communication session establishing method is characterized in that, comprises step:
According to the pre-established request of session that the user sends, between this user and conversation server, set up one or more pre-established sessions in advance, the session ability attribute that described pre-established session is consulted is an inertia;
After described conversation server receives that actual session that session participating user sends is set up request, set up the selection information and the described pre-established session of carrying in the request according to this actual session and set up actual session, and be activity described session ability attribute modification.
2, method according to claim 1 is characterized in that, the described pre-established request of session that sends according to the user is set up one or more pre-established sessions in advance and specifically comprised between this user and conversation server:
Described conversation server receives that the user sends sets up and one or morely carries the pre-established request of session that session ability requires or send a pre-established request of session of having carried a plurality of session abilities, and the session ability attribute of wherein being asked is an inertia;
Described conversation server gives this session pre-established request assign sessions sign, according to subscription data the Session Description Protocol SDP parameter of carrying in the pre-established request of this session is adjudicated simultaneously, gives the SDP parameter of the pre-established request selective system permission of this session;
Conversation server sends the pre-established response of session of the session identification that carries described distribution to the pre-established requesting users of described transmission session, and SDP parameter, the session identification consulted are preserved.
3, method according to claim 2 is characterized in that, described conversation server also comprises after the pre-established requesting users of described transmission session sends the pre-established response of session of the session identification that carries described distribution:
The pre-established requesting users of described transmission session is set up carrying according to the SDP parameter of being consulted.
4, method according to claim 2 is characterized in that, described conversation server also comprises after the pre-established requesting users of described transmission session sends the pre-established response of session of the session identification that carries described distribution:
In the IP Multimedia System IMS system of support policy control, after the entity among the IMS receives that response is set up in the session of conversation server transmission, set up sign Token to policy selection function PDF request carrying, set up the Token that has increased access in the response in described session, response is set up in this session send to the pre-established requesting users of described transmission session.
5, method according to claim 4 is characterized in that, describedly sets up the Token that has increased access in the response in session, and this session is set up after response sends to the pre-established requesting users of described transmission session, also comprises:
The Token that the pre-established requesting users utilization of described transmission session is obtained sets up carrying.
6, method according to claim 3 is characterized in that, the carrying that the pre-established requesting users of described transmission session is set up according to the SDP parameter of being consulted is specially:
In Wideband Code Division Multiple Access (WCDMA) WCDMA system, be the packet data protocol PDP connection of bearer service; In cdma system, be the point-to-point PPP connection or the example of bearer service.
7, method according to claim 2 is characterized in that, the session parameter in the described SDP parameter comprises that session level is described, regularly description and medium type and format description.
8, method according to claim 1 is characterized in that, the described pre-established request of session that sends according to the user after setting up one or more pre-established sessions between this user and the conversation server in advance, also comprises:
The session updates request of carrying session label information and SDP information that the user that described conversation server receives session pre-established sends, in described session of setting up in advance, obtain with this session updates request in the corresponding session of session identification of carrying;
Described conversation server is held consultation the SDP information of carrying in the described session updates request and the SDP information and the subscription data of described corresponding session, and described corresponding session is made amendment;
Send the session updates response to described transmission session updates requesting users.
9, according to each described method in the claim 1～8, it is characterized in that, it is described after described conversation server receives that the actual session of session participating user transmission is set up request, set up the selection information and the described pre-established session of carrying in the request according to this actual session and set up actual session, and be that activity specifically comprises described session ability attribute modification:
Described conversation server is received other user's of invitation who carries session identification and/or SDP sign that the user of pre-established session sends actual session foundation request, conversation server is according to this session identification that carries and/or SDP sign, from this user select corresponding session and SDP information the pre-established session;
Described conversation server utilizes the SDP information of described selection to constitute session and sets up message, message is set up in this session sent to the user who is invited, and set up requesting users transmission acknowledge message to described transmission actual session;
After described conversation server was received replying that the described user who is invited returns, conversation server was set up requesting users for described transmission actual session and is sent the connection request message of carrying session identification.
10, method according to claim 8, it is characterized in that, it is described after described conversation server receives that the actual session of session participating user transmission is set up request, set up the selection information and the described pre-established session of carrying in the request according to this actual session and set up actual session, and be that activity also comprises described session ability attribute modification:
If described transmission actual session is set up requesting users and do not set up carrying, this user sets up carrying.
11, method according to claim 8 is characterized in that, after the session updates request of carrying session label information and SDP information that the user that described conversation server receives session pre-established sends, also comprises:
The user of described conversation server or described pre-established session initiates renewal process, is active state with described session ability attribute modification.
12, according to each described method in the claim 1～8, it is characterized in that, it is described after described conversation server receives that the actual session of session participating user transmission is set up request, set up the selection information and the described pre-established session of carrying in the request according to this actual session and set up actual session, and be that activity specifically comprises described session ability attribute modification:
After described conversation server receives that actual session that the user of non-pre-established session sends is set up request, this actual session set up the SDP information of carrying in the request with the SDP information of pre-established session mate;
Described conversation server obtains in the SDP of described pre-established session information sets up the medium type of the SDP information of carrying in the request with described actual session and/or media capability information equates or SDP information of equal value, equate or the corresponding session of SDP Information Selection of equal value according to this, and set up requesting users transmission response message to described transmission actual session;
Described conversation server sends update request for the user of pre-established session, and the user of described conversation server or described pre-established session initiates renewal process, is active state with described session ability attribute modification.
13, method according to claim 12 is characterized in that, describedly sets up requesting users and sends response message and be specially to sending actual session:
Set up the notification message that session identification is carried in the requesting users transmission to sending actual session; Perhaps,
Set up the notification message that session identification and described SDP message identification are carried in the requesting users transmission to sending actual session.
14, method according to claim 1 is characterized in that, described conversation server is access server or centralized control server.
15, method according to claim 1 is characterized in that, in the press-and-talk PoC system based on honeycomb, described conversation server is the PoC server of execution control function or carries out the PoC server that participates in function.
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| CN101389059B (en) * | 2007-09-11 | 2012-08-08 | 华为技术有限公司 | Method, and device for implementing session mode switching |
| CN102811336A (en) * | 2011-06-03 | 2012-12-05 | 中兴通讯股份有限公司 | Method and apparatus for capability negotiation of multimedia |
| FR2981818A1 (en) * | 2011-10-21 | 2013-04-26 | France Telecom | METHOD OF EXCHANGING INFORMATION RELATING TO ENRICHED COMMUNICATION SERVICES |
| US10237236B2 (en) * | 2015-06-25 | 2019-03-19 | Microsoft Technology Licensing, Llc | Media Session |
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2006
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