CN101267325B

CN101267325B - Method, conference server and terminal for originating and joining in conference session

Info

Publication number: CN101267325B
Application number: CN2007100735898A
Authority: CN
Inventors: 孙谦; 田林一
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-03-16
Filing date: 2007-03-16
Publication date: 2012-02-15
Anticipated expiration: 2027-03-16
Also published as: CN101267325A

Abstract

The invention discloses a method for joining in conference communication, comprising the steps that: after receiving the response that the participator cannot join in the conference communication, the conference centre sends the participator the message comprising conference information, and after receiving the message, the participator sends the conference centre a request for joining the conference communication. With the invention, the participants will not miss some conference communications that they are unable to joint in immediately. The invention also discloses a method for initiating the conference, the initiator sends a conference server the non-session type message comprising the indicative information and conference information which initiates the conference to establish the conference, so that the conference initiator can establish and initiate a conference communication without joining in the conference.

Description

Initiate and add method, Conference server and the terminal of conference call

Technical field

The present invention relates to the convention business of the communications field, relate in particular to the method for the method, Conference server, terminal, the method for initiation conference call, the method for initiating the SIP session and the transmission SIPMESSAGE message that add conference call.

Background technology

Convention business is one of modal value-added service of providing of telecom operators, and convention business can realize that multi-party users communicates simultaneously.Meeting can be used for the communication of various Media Stream type, like the meeting of audio frequency, video and text.Because the meeting real-time that can provide guarantees with high-quality, make that much more more the application based on convention business can be received by people, like shared, the game service of file and blank etc.In instant message IM (Instant Messaging), the logical PoC communication services such as (Push-To-Talkover Cellular) of a key, all support convention business at present, promptly support the mode of multi-party communication.

Comprise following functional entity in the complete conference system: convention goer, Conference server, wherein Conference server further can comprise entities such as conference centre (Focus), media mixer, conference policy server, meeting Subscriber and conferencing policy.The participant of general meeting can be divided into common convention goer and chairman (the normally promoter of meeting or founder), and the authority that they have is different.Conference centre is the core of a meeting.Under session initiation protocol based SIP (SessionInitiation Protocol) implementation; Conference centre can be regarded as a sip user agent UA (User Agent), and representes a meeting through a unified resource identifiers, URIs (Uniform ResourceIdentifier) sign.Conference centre be responsible for keeping and all convention goer between signaling relation, confirm that the convention goer is connected in the meeting.Simultaneously, conference centre also can carry out conferencing policy.The major function of media mixer is with the various types of Media Stream mixed processing that receive, and the Media Stream as a result after will handling then is distributed among the convention goer.The media delivery here can be used RTP (Real-time Transport Protocol) agreement etc.Conference policy server mainly is to be used for the operational administrative conferencing policy, and it can carry out the management to conferencing policy with other relevant non-Session Initiation Protocol such as XCAP (XMLConfiguration Access Protocol) agreements.Conference policy server possibly be on the actual physics and non-existent entity, and common and conference centre is set together.Meeting subscribing notification server is a logic function of being separated by conference centre.Mainly be business, and when conference status changes, notify these booking readers, add if any new user and perhaps leave meeting in order to provide the user to subscribe to conference status.Conferencing policy is the complete set of an order of control.Conferencing policy can be before the conference creation or is formulated during conference creation, is used for instructing conference centre to preside over and manage a meeting.

Each meeting all has a conference centre, corresponding URI sign, and the user identifies oneself with in the meeting and goes through getting in touch this URI.Topological structure between conference centre and the user is a star structure.Conference centre provides for the user and keeps a signaling and connects, and can carry out conferencing policy, realizes control and management to meeting.Can be about the more detailed introduction of convention business and concrete implementation referring to the related specifications and the draft of convention business in SIPPING and the XCON group in the Internet engineering group IETF, like RFC4353 etc.

Pass through a meeting example below and introduce the critical workflow in the present convention business.

Suppose that certain operator provides convention business, and provide a common service sign (PSI) that this common service mark P SI (Public Service Identifier) can be the URI of a sip application server AS (Application Server).User A wants to create a meeting, just can use the SIP UA on the terminal to send the SIP request to this PSI.Application server AS is after receiving this request; If this meeting does not exist and user A has authority to create meeting; Will distribute a conference centre for this request for conference; And response expression session carries out, and the URI of conference centre is included in this response, sets up the SIP session between this user terminal and the conference centre.Conference centre is according to participant's tabulation of this scheduling meeting justice then; Or user A participant's tabulation of carrying when initiate creating the SIP request of meeting; Send the request that adds meeting of inviting to other participants of this meeting, return the participant and confirm it to be joined in the conference call after corresponding.

Main signaling process figure referring to initiation conference call shown in Figure 1; User agent UA1 sends SIP INVITE request to the application server AS of convention business; AS through 302 responses return distribute the URI (like Conf-ID@example.org) of the Focus of conference centre; User agent UA1 receives the response back and initiates the INVITE request to the URI of conference centre, sets up conference call.Conference centre sends the INVITE request to other participants such as UA2, invites it to add, and receives the affirmation response back that the participant returns and sets up conference call with it.

In the existing convention business flow process; If in conference centre after the participant sends INVITE request; The participant can't reply 200OK response to conference centre, promptly because some are former thereby can't set up the conversation with conference centre, like terminal out of reach, busy etc.; Perhaps the participant did not think at that time to add meeting immediately and had refused the INVITE request of conference centre, and follow-up like this participant is difficult to join in this conference call again.

Summary of the invention

The technical problem that the present invention will solve has been to propose a kind of method that adds conference call, makes also to join in the conference call to sending the participant who invites the conference centre that adds the conference call request to reply the affirmation response.

The invention allows for a kind of method of initiating conference call, the meeting promoter need not be set up with the session of conference centre can create meeting.

The invention allows for a kind of Conference server,, also can invite participation person add conference call even the participant can't add conference call request answer affirmation response to inviting.

The invention allows for another kind of Conference server, can not pass through the request of conversation class and create meeting.

The invention allows for a kind of terminal, can initiate a session request according to indication.

The invention allows for a kind of method of the SIP of initiation session, need not be directly initiate immediately and set up the SIP session, but must indicate the recipient to initiate the SIP session indirectly through SIP INVITE request.

The invention allows for a kind of method of the SIP of transmission MESSAGE message, the SIP MESSAGE message of sending before the SIPMESSAGE message that the back is sent can be replaced or delete.

For addressing the above problem, the technical scheme that the present invention proposes is following:

A kind of method that adds conference call, the method comprising the steps of:

Conference centre receives the response that the participant can't add conference call after sending the request of inviting the adding conference call to the participant;

Conference centre sends the message that comprises conferencing information to said participant, and described conferencing information comprises the address of conference centre at least;

After the participant receives the described message that comprises conferencing information, send the request that adds conference call to the address of said conference centre.

Further, said conference centre is receiving after the participant can't add the response of conference call, if should response indication participant temporarily unreachable, then conference centre comprises the message of conferencing information again to its transmission after a preset time.

Conference centre to the participant send comprise the message of conferencing information after; If conference centre does not receive that said participant has received the response of this message; This message of conference centre's buffer memory then, and in that meeting adjourned or retransmitted before participant's joining day at the latest.

If said participant does not still add conference call when meeting adjourned, conference centre sends updating message and indicates meeting to finish to the participant.

Comprise the indication information that to confirm former message in the described updating message, when the sender of indication information and definite updating message and former message is identical in view of the above, deletes former message or indicate former message to be replaced by said updating message.

If when the content of described updating message is empty, then delete former message and updating message simultaneously.

After meeting adjourned, the message that conference centre will comprise meeting summary information or its corresponding link sent to the participant.

Described meeting has termination time or participant's joining day at the latest, and conference centre is provided with the expired time of the said message that comprises conferencing information of sending to the participant in view of the above.

In the message that comprises conferencing information that the participant sends, comprise the features tab in said conference centre, said features tab indicates the recipient should support to add conference call according to the conferencing information in the message; This message is routed to the participant's who supports said features tab user agent.

In the message that comprises conferencing information that the participant sends, comprised the indication participant in said conference centre and carried out the communication type that conference call should adopt, participant's indication information in view of the above adopts the user agent of respective communication type to ask to add conference call.

A project is set in conferencing policy in advance; Whether indication sends the message that comprises conferencing information accordingly when receiving after the participant can't add the response of conference call, and conference centre's directory entry in view of the above determines whether to send the message that comprises conferencing information accordingly.

The request that the invitation that said conference centre sends to the participant adds conference call is SIP INVITE request, and the response that the said participant who receives can't add conference call is the errored response in the request Fail Type in the Session Initiation Protocol; It is SIPMESSAGE that said conference centre sends the message that comprises conferencing information to the participant; Conference centre is included in described conferencing information in the message body of MIME medium type; And in MIME field Content-Disposition of this message, comprise the processing indication of message body content, be used for indicating the recipient should support to add conference call according to the conferencing information in the MIME message body; After the participant receives the described SIP MESSAGE message that comprises conferencing information, send the SIPINVITE request that adds conference call, the destination address Request-URI of this request is set to the address of said conference centre.

The request that the invitation that said conference centre sends to the participant adds conference call is SIP INVITE request, and the response that the said participant who receives can't add conference call is the errored response in the request Fail Type in the Session Initiation Protocol; It is SIPMESSAGE that said conference centre sends the message that comprises conferencing information to the participant; Conference centre is included in described conferencing information in the message body of MIME medium type; And in a field Accept-Contact of this message, comprising a features tab, said features tab indicates the recipient should support to add conference call according to the conferencing information in the message; After the participant receives the described SIP MESSAGE message that comprises conferencing information, send the SIP INVITE request that adds conference call, the destination address Request-URI of this request is set to the address of said conference centre.

Before said conference centre adds the SIP INVITE request of conference call to the invitation that the participant sends; Also comprise step: Conference server receives the SIP MESSAGE message that comprises conferencing information; Said conferencing information is included in the message body of MIME medium type; And comprise a features tab among the field Accept-Contact of this message; Said features tab indicates Conference server should support to create conference call according to the conferencing information in the message, and Conference server is created conference centre according to said features tab.

A kind of method of initiating conference call, the method comprising the steps of:

The promoter sends to Conference server and comprises the indication information of initiating meeting and the message of conferencing information;

After Conference server receives said message, create meeting, and send the request that adds conference call of inviting to the participant of meeting according to described indication information and conferencing information.

After said Conference server receives said message,, just creates the meeting start time in the conferencing information meeting when arriving.

Said promoter is SIP MESSAGE to the message that Conference server sends; And the meeting packets of information is contained in the message body of MIME medium type; In a field Accept-Contact of this message, comprise a features tab, said features tab indicates Conference server should support to create conference call according to the conferencing information in the message; After Conference server is created conference call, send the SIPINVITE request that adds conference call of inviting, perhaps send and invite the SIP MESSAGE message that adds conference call to the participant to the participant.

Conference server receives the response that the participant can't add conference call after sending the SIP INVITE request of inviting the adding conference call to the participant; Conference server sends the SIP MESSAGE message that comprises conferencing information to said participant, and described conferencing information comprises the SIP URI address of meeting at least; After the participant receives the described message that comprises conferencing information, send the SIP INVITE request that adds conference call to the SIP of said meeting URI address.

Said promoter is SIP MESSAGE to the message that Conference server sends; And the meeting packets of information is contained in the message body of MIME medium type; And in MIME field Content-Disposition of this message, comprise the processing indication of message body content, be used for indicating the recipient should support to create conference call according to the conferencing information in the MIME message body; After Conference server is created conference call, send the SIP INVITE request that adds conference call of inviting, perhaps send and invite the SIP that adds conference call to the participant to the participant

MESSAGE message.

After the conferencing information that comprises at least two meetings in the described message, Conference server receive said message, for each conferencing information is created meeting respectively.

A kind of method of initiating the SIP session, the method comprising the steps of:

First user agent sends SIP MESSAGE message, wherein comprises the indication information that shows that this message is initiated the SIP session for invitation, and the destination address Request-URI that initiates the SIP session;

After second user agent receives described SIP MESSAGE message, ask to initiate the SIP session to described destination address Request-URI thereby send SIP INVITE according to described indication information.

First user agent said indication information is arranged in the features tab among the SIP MESSAGE message header field Accept-Contact and/or MIME field Content-Disposition in.

Second user agent obtains described destination address Request-URI from the message body of From field of SIP MESSAGE message or MIME medium type.

First user agent also is provided with term of validity information in the SIP MESSAGE message of sending; Second user agent who receives described SIP MESSAGE message is within the term of validity of this message; Just can send SIP INVITE and ask, thereby initiate the SIP session to described destination address Request-URI according to described indication information.Term of validity information can be arranged among the Expires and Date field of MESSAGE message.

A kind of Conference server comprises conference centre, and described conference centre is used for sending the message that comprises conferencing information receiving after the participant can't add the response of conference call to said participant, and described conferencing information comprises the address of conference centre at least.

Described Conference server also comprises conference policy server; Be used to store conferencing policy; It is characterized in that; Also comprise a directory entry in the said conferencing policy, be used for receiving after the participant can't add the response of conference call, determine whether to send the message that comprises conferencing information to said participant according to said directory entry in conference centre; Described directory entry is provided with through conference policy server by the user agent, perhaps is provided with according to the message that the user agent who receives sends by conference centre.

A kind of Conference server, described Conference server further comprises receiving element, conference creation unit and conference centre;

Said receiving element is used for comprising the indication information of initiating meeting and the non-conversation class message of conferencing information receiving to send, and notification of meetings establishment unit;

Said conference creation unit is used for creating conference centre according to described indication information and conferencing information;

Said conference centre is used for sending the request that adds conference call of inviting to the participant of meeting.

The request of initiation session is sent in a kind of terminal, said terminal to said destination address after the message that receives the destination address that comprises the indication information of inviting initiation session and initiation session.

Terminal according to claim 24; Comprise sip user agent; It is characterized in that; Said sip user agent is used to receive the message of the destination address that comprises the indication information of inviting initiation session and initiation session, and this message is SIP MESSAGE message, comprises in the features tab among its field Accept-Contact to show that this message is for inviting the indication information of initiating the SIP session; And comprise the destination address Request-URI that initiates the SIP session in the message, thereby sending SIP INVITE according to described indication information, sip user agent asks to initiate the SIP session to described destination address Request-URI.

A kind of method that transmits SIP MESSAGE message, the method comprising the steps of:

Second user agent receives the SIP MESSAGE message that first user agent sends;

First user agent sends and comprises the 2nd SIPMESSAGE message of replacing a SIP MESSAGE message indication information;

Second user agent replaces processing with the 2nd SIP MESSAGE message to a SIPMESSAGE message according to said indication information.Certain second user agent will confirm also that generally the sender of two message wants the identical processing of just replacing.

The user agent here can be arranged in user's terminal such as computer, mobile phone or PDA etc., also can be arranged in application server.If after first user agent sends a SIP MESSAGE message; What receive is not the 200OK response; But 202Accepted; Be that message successfully sends to certain gateway or server, but do not guarantee that one sends to the targeted customer to this message surely that second user agent of this moment is certain gateway or server rather than targeted customer; At this moment first user agent sends and comprises the 2nd SIP MESSAGE message of replacing a SIP MESSAGE message indication information, then can before a SIP MESSAGE message arrives the final goal user, just replace this message.

Described indication information is first user agent comprises a SIP MESSAGE message in Replaces field of the 2nd SIP MESSAGE message dialogue Call-ID;

Second user agent replaces processing with the SIP MESSAGE message that the dialogue Call-ID in Replaces the field of the value of dialogue Call-ID in this locality and the 2nd SIP MESSAGE message is complementary.

If the content of the 2nd SIP MESSAGE message is empty, then described replacement is treated to second user agent and deletes SIP MESSAGE message and the 2nd SIPMESSAGE message that is complementary with the 2nd SIP MESSAGE message.

Beneficial effect of the present invention is following:

The present invention is through receiving the response that the participant can't add conference call in conference centre; Send the message that comprises conferencing information to said participant; The participant can send the request that adds conference call to conference centre in view of the above, thereby makes the participant can not miss the conference call that some oneself can't add immediately.Also pass through in addition to create meeting to the message that Conference server sends the non-conversation class comprise the indication information of initiating meeting and conferencing information by the promoter; The meeting promoter needn't be joined in the meeting can create and initiate a conference call, but also can create a plurality of meetings in batches.The present invention also through comprising the replacement indication information of message before in the SIPMESSAGE message, makes the sender of the message replace processing to the message of having sent, and particularly can be used for deleting the MESSAGE message of sending out mistake.The present invention also shows that through in SIP MESSAGE message, comprising this message is for inviting the indication information of initiating the SIP session in addition; Come the recipient of Indication message to initiate a SIP session, can make the recipient freely select the suitable time to initiate the SIP session like this.

Description of drawings

Fig. 1 is the main signaling process figure that initiates conference call in the prior art,

Fig. 2 adds the basic flow sheet of conference call for the present invention invites the user,

Fig. 3 adds the main signaling process figure of conference call for the present invention invites the user,

The main signaling process figure that Fig. 4 initiates meeting for the present invention with MESSAGE message,

Fig. 5 be the Conference server in the first embodiment of the invention internal structure and and the participant user agent between annexation figure,

Fig. 6 be the Conference server in the second embodiment of the invention internal structure and and the user agent between annexation.

Embodiment

With reference to Fig. 2, this figure is that the present invention invites the user to add the basic flow sheet of conference call, comprises the steps:

Step S10, conference centre receive the response that can't add conference call that participant terminal or its agency return after sending the request of inviting the adding conference call to the participant terminal;

Step S11, conference centre sends the message that comprises conferencing information to the participant terminal, and conferencing information wherein comprises the address of conference centre at least;

Step S12 after the participant terminal receives the above-mentioned message that comprises conferencing information, sends the request that adds conference call to the address of conference centre;

Step S13, the conference call between conference centre's foundation and the participant terminal.

Describe concrete technical scheme in detail based on Session Initiation Protocol among the first following embodiment.With reference to Fig. 3, this figure the present invention is based on Session Initiation Protocol to invite the user to add the main signaling process figure of conference call, and some conspicuous SIP signalings such as ACK etc. have omitted from succinct reason.Supposition conference centre sets up in the present embodiment, has distributed resource and address promptly for this meeting, and the address of conference centre is SIP URI, is assumed to sip:Conf-ID@huawei.com here.Basic procedure mainly comprises the steps:

Step 30, the Focus of conference centre sends the user agent UA that INVITE is given the participant, invites it to add conference call.

Step 31, participant's user agent UA or its are acted on behalf of Proxy to the SIP errored response that conference centre returns the 4XX type, can't join in the conference call.

More than these two steps 30 the same with 31 with prior art, but prior art just communication between conference centre and user agent UA after receiving 4XX, and the present invention also will continue following step:

Step 32, conference centre sends the SIP MESSAGE message that comprises conferencing information to user agent UA.

Step 33, user agent UA sends the INVITE request that adds conference call according to the conferencing information in the MESSAGE message to conference centre.

After conference centre receives the INVITE request of user agent UA, the conference call between foundation and the participant.

Further, can also carry out different processing methods to different 4XX request failure responses (Request Failure).As for the busy response of 486 " Busy Here "; Conference centre can send the SIP MESSAGE message that comprises conferencing information immediately; Even can't accept the INVITE request because user agent UA is in busy state at present, but generally not influence normal reception MESSAGE message; And all indicated the participant temporarily unreachable for 404 " Not Found " response or 480 " Temporarily Unavailable " response etc.; The SIP MESSAGE message that conference centre can redispatch after a preset time and comprise conferencing information; Because possible user does not also carry out the SIP registration at present; Or out of reach, can't find this user, so the SIP MESSAGE message that can redispatch after a period of time and comprise conferencing information.Like 414 " Request-URI TooLong ", the user agent also can't receive the situation of the SIP MESSAGE message of conference centre to the response of some 4XX type, then conference centre's MESSAGE message of can not redispatching.Can also in conferencing policy, increase a project in addition, whether indication sends corresponding SIP MESSAGE message after invite participation person's INVITE request failure.

Referring to Fig. 5 show the Conference server among first embodiment main internal structure and and user agent UA between annexation.Wherein the participant can pass through some non-Session Initiation Protocol such as XCAP agreement and meeting policy server interaction and creates and revise conferencing policy, perhaps sends in the sip message body of conference centre and carries the conferencing policy data, and conferencing policy is created and revised in conference centre.

After if conference centre sends and comprises the SIP MESSAGE message of conferencing information; Do not receive that user agent UA returns 200OK message; Be that user agent UA does not receive this MESSAGE message; Then conference centre can this MESSAGE message of buffer memory, before meeting adjourned, retransmits by certain time interval, has not just redispatched after meeting adjourned.

If still do not add when user agent UA arrives the meeting end, then conference centre's this user agent UA meeting of MESSAGE message informing of automatic transmission finishes when finishing.Some summary information that can comprise this meeting in this MESSAGE message are like the beginning and ending time of meeting, participant etc.Can in this MESSAGE message, indicate this message in addition is original updating message of inviting that MESSAGE message that adds meeting; The user agent indicates in view of the above and can directly delete that original message, so as not to the user in meeting adjourned back owing to seen that earlier inviting that MESSAGE message that adds meeting just to initiate INVITE has asked.Concrete indicating means is as using Replaces field of replacement; In Replaces field of back MESSAGE message of sending, comprise the dialogue Call-ID of that MESSAGE message before that will upgrade; The label tag that can also comprise From and To field is from-tag, to-tag, is used for unique that MESSAGE message that receives before confirming.After the user agent receives Replaces field MESSAGE message of band, will with Call-ID in this Replaces field, the mark that former message has been updated is perhaps made in and the MESSAGE message deletion that is complementary of from-tag, to-tag.Also can include only Call-ID in Replaces the field, so only Call-ID mated and get final product.The sender that will confirm back one message certainly earlier is identical just passable with the sender of last message, promptly shows that a field of identity of the sender is identical in two message, like From field or P-Asserted-Identity field etc., to guarantee fail safe.The content example of the Replaces field of MESSAGE message is following, and wherein the target user address Request-URI of two MESSAGE message is identical:

MESSAGE?sip:user＠example.org?SIP/2.0

Replaces：425928＠example.org

Last MESSAGE message comprises theing contents are as follows of Call-ID:

MESSAGE?sip:user＠example.org?SIP/2.0

Call-ID：425928＠example.org

The user who sends message through said method can delete the MESSAGE message that has sent before; As sent wrong MESSAGE message to another user; Appointment in the MESSAGE message of having sent before perhaps having cancelled or message request etc. can use said method.If also no show final goal of the MESSAGE message user who before sends; But be buffered in the network in the server; After if this server has received follow-up band Replaces field MESSAGE message again, that MESSAGE message before then will not redispatching is if the message body of follow-up band Replaces field MESSAGE message is empty; Then do not send follow-up MESSAGE message, the MESSAGE message before promptly being equivalent to delete yet.The message body that the user agent receives follow-up band Replaces field MESSAGE message also can directly be deleted its MESSAGE message before corresponding, nor show follow-up MESSAGE message when empty.

If this meeting has clear and definite termination time or participant's joining day at the latest, then conference centre is arranged on this time in the Expires and Date field of MESSAGE message header, and the expired time of this message promptly is set.Receive the corresponding MESSAGE message of meeting that the user agent UA of this message can can't add according to the automatic deletion of information in Expires and the Date field like this; Perhaps carry out special demonstration, carry out flash for prompting etc. like the corresponding MESSAGE message of meeting that soon can't add.

After meeting adjourned,, then can also comprise meeting summary or its corresponding link URL sends to the participant with MESSAGE message if meeting summary has been received by conference centre.

Can be in a field Accept-Contact of the MESSAGE message that conference centre sends; Comprise features tab (feature tag); This features tab need register at internet numbers distributor gear IANA; Can be "+msginvitation " like the features tab in the message, the user agent that expression receives this message should be able to support to add conference call according to the conferencing information in the message.This MESSAGE message can be routed to the user agent that can handle the corresponding characteristic of this label; When user agent UA receives MESSAGE message; Also can be worth to adopt and support the client software that to handle convention business to handle this MESSAGE message, extract the conferencing information in the message and can send the request that adds conference call according to this features tab.

Concrete; In the MESSAGE message of sending like conference centre at the logical PoC service of a key; Features tab among the field Accept-Contact can comprise "+g.poc.talkburst " and "+g.poc.groupad ", and the user agent that indication receives this MESSAGE message need support PoC service and group advertisement.Described support group advertisement can be handled multi purpose internet mail extensions MIME (the Multipurpose Internet Mail Extentions) message body that comprises group advertisement; As " application/vnd.poc.group-advertisement+xml " medium type of having registered; Some conferencing informations have promptly been comprised in this group advertisement; Its content comprises that mainly the address of meeting is URI and other descriptor such as display name display-name and annotation information note etc.; The MIME medium type of above-mentioned group advertisement capable of using comprises conferencing information in the MESSAGE message body that conference centre sends, and the particular content of message body is exemplified below:

<group-advertisement>

<note>This?meeting?is?open?until16o’clock</note>

<group?type＝＂dialed-in＂>

<display-name>Huawei?IETF?group</display-name>

<uri>sip:Conf-ID＠example.com</uri>

</group>

<purpose>invitation</purpose>

</group-advertisement>

In order to distinguish with common group advertisement; The information that has increased an indication group advertisement purposes in the above-mentioned example is as expanding the daughter element of < purpose>element as < group-advertisement >; It perhaps is purpose attribute of < group-advertisement>element expansion; When the value of < purpose>element or purpose attribute is indicated " invitation " for inviting, represent that this group advertisement is that a conference call is invited, indication user agent UA can add according to the information in the group advertisement in the corresponding conference call.

When the features tab among the field Accept-Contact of certain in fact MESSAGE message has comprised "+g.poc.talkburst ", also can be used for indicating user agent UA to add according to the information in the group advertisement in the corresponding conference call.Other indicating means also has Purpose field of expansion in a field of MESSAGE message, and its value can be set to invite indication " invitation "; Perhaps in MIME field of MESSAGE message body, expand a Content-Purpose field, its value can be set to invite indication " invitation ".

Can also directly in the field Content-Disposition of MIME, comprise and handle indication " invitation ", the expression recipient should be according to inviting indication to handle the content of this MIME.

In a field Require of MESSAGE message, generally can comprise needs support in addition and invite the information of indication, like " invitation ".

More than provided several kinds of indication MESSAGE message for inviting the message of type, the user agent who promptly receives this message can initiate a corresponding INVITE request according to the content of this message.Provide two kinds of MIME message body that can comprise conferencing information below again.

In RFC4575, provided the MIME medium type of a kind of " application/conference-info+xml ", wherein comprised the address information of meeting in < conf-uris>element, also comprised the descriptor of some meetings and participant's information etc.Conference centre can use this medium type to carry conferencing information in the MESSAGE message of sending in the present embodiment.

At present more detailed conferencing information data model (Conference Information Data Modelfor Centralized Conferencing) is just worked out in the XCON of IETF group; Conference centre can use this data model to carry conferencing information in the MESSAGE message of sending; Certainly generally need only carry the part conferencing information in this data model according to actual conditions, rather than whole contents.Features tab in simultaneously can Accept-Contact of new registration, like "+msg-invitation ", the user agent that expression receives this MESSAGE message will support to use information creating meeting in the MESSAGE message body.Comprise "+msg-invitation " among the features tab in the Accept-Contact of the MESSAGE message that conference centre sends, use said conferencing data model to carry conferencing information in the message body.This MESSAGE message can be routed to the user agent who supports the indicated function of treatment characteristic label "+msg-invitation ".

Conference centre can also comprise the indication participant and carry out the communication type that conference call should adopt in the message that comprises conferencing information that the participant sends; Like PoC, IM still is VoIP etc., and participant's indication information in view of the above adopts the user agent of respective communication type to ask to add conference call.This indication information also can adopt features tab's mode; As hope that the participant passes through the PoC client and adds conference call, then conference centre comprises "+g.poc.talkburst " among the features tab among the field Accept-Contact in the MESSAGE message of sending; As hope that the participant passes through instant message IM client and adds conference call, then in the features tab, comprise "+g.oma.sip-im ".

Also can adopt plain text " text/plain " type to carry conferencing information in addition, the content that at this moment comprises in the message body is some readable meeting descriptors, like meeting title, time, participant etc.; And sender's field of the MESSAGE message that conference centre sends must be set to the URI address of conference centre; The user agent who receives this message so just in view of the above field send the INVITE request that adds conference call to conference centre, wherein the destination address Request-URI in the INVITE request is set to the URI address of conference centre.

In the second embodiment of the present invention, the promoter of meeting directly sends MESSAGE message initiation meeting with the user agent of oneself.The promoter that an application scenarios of present embodiment is meeting initiates a meeting like the secretary who organizes a meeting according to the arrangement of being responsible for; But secretary oneself need not join in the meeting; Asking the method for this conversation class to create meeting with INVITE then can also join oneself in the conference call; And MESSAGE message is the method for non-conversation class, and the promoter of meeting is as long as one or more meetings can created and initiate to MESSAGE message of simple transmission.Main signaling process figure referring to shown in Figure 4 comprises step:

Step 40, the promoter UA1 of meeting sends MESSAGE message to Conference server, and this message is used for initiating conference call.In MESSAGE message, comprise the information of this message of indication, and can comprise conferencing information in the message body, like participant's tabulation of meeting, title, time and the conferencing policy etc. of meeting for the establishment meeting.Logical PoC is an example with a key, and concrete main contents of creating the SIPMESSAGE message of meeting are exemplified below:

Request-URIsip:OMA-Golf-buddies＠networkX.net

P-Preferred-Identity：＂PoC?User?A＂<sip:PoC-UserA＠networkA.net>

Accept-Contact： ^*；+g.poc.groupad；require；explicit

Purpose invitation

Content-Type： application/vnd.poc.group-advertisement+xml

XML?MIME?BODY

<?xml?version＝＂1.0＂encoding＝＂UTF-8＂?>

<group-advertisement>

<group?type＝＂dialed-in＂>

<display-name>Golf?Buddies</display-name>

<uri>sip:OMA-Golf-buddies＠networkX.net</uri>

</group>

</group-advertisement>

In the above-mentioned example, in MESSAGE message header field, use the Purpose field, its value is set to invite indication " invitation ", and indicating this MESSAGE message is to create meeting.Can certainly use among first embodiment other some indicating means; Repeat no more here; The method that the present invention recommends to use is the features tab among Accept-Contact of new registration; Like "+g.poc.msg-invitation ", expression receives the server of this MESSAGE message will support to use information creating meeting in the MESSAGE message body, and needn't expand a field of MESSAGE message.The MIME medium type that adopts in the MESSAGE message body also can be with reference among first embodiment given several kinds.

Step 41, Conference server be according to this MESSAGE message establishing conference centre, and distribute corresponding SIP URI address for this meeting.After Conference server receives this MESSAGE message; Finding wherein has the indication information of creating meeting; Features tab as in a field Accept-Contact comprises "+g.poc.msg-invitation ", then according to the content creating conference centre of MESSAGE message body.Can directly comprise convention goer's URI tabulation in this MESSAGE message, also can comprise the corresponding URI of group of convention goer, conference centre obtains convention goer's URI tabulation according to the URI of group.The temporal information that can also comprise meeting in addition in the MESSAGE message body, like the time started of meeting, then Conference server is just created conference centre when the time started of described meeting arrives.

Step 42, conference centre sends the INVITE request to the participant (like UA2 and UA3) of this meeting, invites it to add conference call.Conference centre gets access to convention goer's URI, sends the INVITE request respectively to it.

After the participant of meeting returned the affirmation response, the conference call between conference centre's foundation and the participant (like UA2 and UA3) can adopt Real-time Transport Protocol to converse.If the convention goer returns 4XX, then can use the method among first embodiment, conference centre sends the MESSAGE message that comprises conferencing information to these participants, and concrete steps are referring to first embodiment.

The promoter of meeting can also subscribe to conference status through the meeting Subscriber in addition, even oneself do not join the situation that also can understand meeting in the conference call, like the participant of active conference etc.

The promoter of a meeting can also use the MESSAGE message that comprises conferencing information to create and initiate meeting in batches, and concrete method promptly comprises the respectively corresponding different meeting of a plurality of MIME contents and gets final product in MESSAGE message body.As use content type Content-type to comprise the conferencing information of a plurality of content types for " application/conference-info+xml " for the message body of " multipart/mixed "; Can also in MIME field Content-Disposition, comprise the indication of creating meeting, like " create-conference ".Conference server will be created corresponding conference centre respectively in view of the above.An INVITE request then can't be created a plurality of meetings simultaneously.

In fact; For some is not very formal conference scenario; Like a pairing conference centre in chatroom; In step 42, can directly send MESSAGE message rather than the INVITE request that comprises conferencing information, invite it to add the conference call of chatroom to the participant (like UA2 and UA3) of this meeting.The participant who receives MESSAGE message can according to circumstances select the suitable time initiatively to send in INVITE request and the adding conference call to conference centre again.

Participate in the Conference server among second embodiment shown in Figure 6 internal structure and and the user agent between annexation, Conference server can comprise receiving element, conference creation unit and conference centre.Receiving element comprises the indication information of initiating meeting and the non-conversation class message of conferencing information receiving to send; And notification of meetings is created the unit; Conference centre is created according to described indication information and conferencing information in the conference creation unit, and conference centre sends the request that adds conference call of inviting to the participant of meeting.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. method that adds conference call is characterized in that the method comprising the steps of:

2. method according to claim 1; It is characterized in that; Said conference centre is receiving after the participant can't add the response of conference call, if should response indication participant temporarily unreachable, then conference centre comprises the message of conferencing information again to its transmission after a preset time.

3. method according to claim 1; It is characterized in that; Conference centre to the participant send comprise the message of conferencing information after; If conference centre does not receive that said participant has received the response of this message, this message of conference centre's buffer memory then, and in that meeting adjourned or retransmitted before participant's joining day at the latest.

4. method according to claim 1 is characterized in that, if said participant does not still add conference call when meeting adjourned, conference centre sends updating message and indicates meeting to finish to the participant.

5. method according to claim 4; It is characterized in that; Comprise the indication information that to confirm former message in the described updating message; When the sender of indication information and definite updating message and former message is identical in view of the above, deletes former message or indicate former message to be replaced by said updating message.

6. method according to claim 5 is characterized in that, if when the content of described updating message is empty, then deletes former message and updating message simultaneously.

7. method according to claim 1 is characterized in that, after meeting adjourned, the message that conference centre will comprise meeting summary information or its corresponding link sent to the participant.

8. method according to claim 1 is characterized in that, described meeting has termination time or participant's joining day at the latest, and conference centre is provided with the expired time of the said message that comprises conferencing information of sending to the participant in view of the above.

9. according to each described method of claim 1 to 8; It is characterized in that; In the message that comprises conferencing information that the participant sends, comprise the features tab in said conference centre, said features tab indicates the recipient should support to add conference call according to the conferencing information in the message; This message is routed to the participant's who supports said features tab user agent.

10. method according to claim 9; It is characterized in that; In the message that comprises conferencing information that the participant sends, comprised the indication participant in said conference centre and carried out the communication type that conference call should adopt, participant's indication information in view of the above adopts the user agent of respective communication type to ask to add conference call.

11. method according to claim 1; It is characterized in that; A project is set in conferencing policy in advance; Whether indication sends the message that comprises conferencing information accordingly when receiving after the participant can't add the response of conference call, and conference centre's directory entry in view of the above determines whether to send the message that comprises conferencing information accordingly.

12. method according to claim 1; It is characterized in that; The request that the invitation that said conference centre sends to the participant adds conference call is SIP INVITE request, and the response that the said participant who receives can't add conference call is the errored response in the request Fail Type in the Session Initiation Protocol;

It is SIP MESSAGE that said conference centre sends the message that comprises conferencing information to the participant; Conference centre is included in described conferencing information in the message body of MIME medium type; And in MIME field Content-Disposition of this message, comprise the processing indication of message body content, be used for indicating the recipient should support to add conference call according to the conferencing information in the MIME message body;

After the participant receives the described SIP MESSAGE message that comprises conferencing information, send the SIP INVITE request that adds conference call, the destination address Request-URI of this request is set to the address of said conference centre.

13. method according to claim 1; It is characterized in that; The request that the invitation that said conference centre sends to the participant adds conference call is SIP INVITE request, and the response that the said participant who receives can't add conference call is the errored response in the request Fail Type in the Session Initiation Protocol;

It is SIP MESSAGE that said conference centre sends the message that comprises conferencing information to the participant; Conference centre is included in described conferencing information in the message body of MIME medium type; And in a field Accept-Contact of this message, comprising a features tab, said features tab indicates the recipient should support to add conference call according to the conferencing information in the message;

14. method according to claim 13 is characterized in that, before said conference centre adds the SIP INVITE request of conference call to the invitation that the participant sends, also comprises step:

Conference server receives the SIP MESSAGE message that comprises conferencing information; Said conferencing information is included in the message body of MIME medium type; And comprise a features tab among the field Accept-Contact of this message; Said features tab indicates Conference server should support to create conference call according to the conferencing information in the message, and Conference server is created conference centre according to said features tab.

15. a method of initiating conference call is characterized in that the method comprising the steps of:

After Conference server receives said message; Create meeting according to described indication information and conferencing information; And send the SIP INVITE request that adds conference call of inviting to the participant of meeting, perhaps send and invite the SIP MESSAGE message that adds conference call to the participant of meeting;

Conference server receives the response that the participant can't add conference call;

Conference server sends the SIP MESSAGE message that comprises conferencing information to said participant, and described conferencing information comprises the SIP URI address of meeting at least;

After the participant receives the described message that comprises conferencing information, send the SIP INVITE request that adds conference call to the SIP of said meeting URI address.

16. method according to claim 15 is characterized in that, after said Conference server receives the said message that comprises the indication information of initiating meeting and conferencing information, when the meeting start time in the conferencing information arrives, just creates meeting.

17. method according to claim 15; It is characterized in that; Said promoter is SIP MESSAGE to the message that Conference server sends; And the meeting packets of information is contained in the message body of MIME medium type, in a field Accept-Contact of this message, comprising a features tab, said features tab indicates Conference server should support to create conference call according to the conferencing information in the message;

After Conference server is created conference call, send the SIPINVITE request that adds conference call of inviting, perhaps send and invite the SIP MESSAGE message that adds conference call to the participant to the participant.

18. method according to claim 15; It is characterized in that; Said promoter is SIP MESSAGE to the message that Conference server sends; And the meeting packets of information is contained in the message body of MIME medium type, and in MIME field Content-Disposition of this message, comprise the processing indication of message body content, be used for indicating the recipient should support to create conference call according to the conferencing information in the MIME message body;

19. according to each described method of claim 15 to 18; It is characterized in that; The conferencing information that comprises at least two meetings in the described message that comprises the indication information of initiating meeting and conferencing information is after Conference server receives said message, for each conferencing information is created meeting respectively.

20. a Conference server is characterized in that, comprises receiving element, conference creation unit and conference centre; Receiving element comprises the indication information of initiating meeting and the non-conversation class message of conferencing information receiving to send; And notification of meetings is created the unit; Conference centre is created according to described indication information and conferencing information in the conference creation unit, and conference centre sends the request that adds conference call of inviting to the participant of meeting; Described conference centre also is used for sending the message that comprises conferencing information receiving after the participant can't add the response of conference call to said participant, and described conferencing information comprises the address of conference centre at least.

21. Conference server according to claim 20; Also comprise conference policy server; Be used to store conferencing policy, it is characterized in that, also comprise a directory entry in the said conferencing policy; Be used for receiving after the participant can't add the response of conference call, determine whether to send the message that comprises conferencing information to said participant according to said directory entry in conference centre; Described directory entry is provided with through conference policy server by the user agent, perhaps is provided with according to the message that the user agent who receives sends by conference centre.