CN101459897A - Media negotiation method in forwarding service - Google Patents
Media negotiation method in forwarding service Download PDFInfo
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- CN101459897A CN101459897A CNA2008100902946A CN200810090294A CN101459897A CN 101459897 A CN101459897 A CN 101459897A CN A2008100902946 A CNA2008100902946 A CN A2008100902946A CN 200810090294 A CN200810090294 A CN 200810090294A CN 101459897 A CN101459897 A CN 101459897A
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Abstract
The invention discloses a media negotiation method in forward shifting business, which comprises: sending a forward shifting session request without calling user media to a forward shifting target user by a forward shifting application server if a calling user and the forward shifting user are judged to alternate medium information through media negotiation when the forward shifting application server triggers the forward shifting business in the process of session establishment. Compared with the prior art, the method solves the problem in the prior art that media negotiation oscillation appears in non-response forward shifting business or busy forward shifting business (a called user refuses to answer).
Description
Technical field
The present invention relates to the communications field, relate in particular to the media consulation method in a kind of forward-shifting service.
Background technology
IP (Internet Protocol, network interconnection agreement) IP multimedia subsystem, IMS (IP MultimediaSubsystem, be called for short IMS) be by the 3G core net of third generation partner program (Third Generation Partner-ShipProject is called for short 3GPP) definition the network architecture to complete IP network evolution.It is the communication system of being made up of business control device, customer data base, network interworking equipment etc. that superposes on packet domain, in order to IP multimedia service to be provided.It adopts SIP (Session Initiation Protocol, session initiation protocol) as the control signaling, and mobile management, Multimedia session function are provided, and has realized service management, carrying control, the separation that carrying inserts.
In IMS, the preceding commentaries on classics type that forward-shifting service provides comprises Call Forwarding Unconditional, Call Forwarding No Reply, divert when busy, unregistered preceding commentaries on classics, Call Forwarding on mobile subscriber Not Reachable.Wherein, Call Forwarding Unconditional, Call Forwarding No Reply and divert when busy are based on PSTN (Public Switched Digital Service, be called for short PSTN)/supplementary service of integrated services digital network (Integrated Service Digital Network is called for short ISDN); Change the demand that is based on IP network before unregistered; Call Forwarding on mobile subscriber Not Reachable is based on mobile network's demand.
In forward-shifting service, relate to the processing based on negotiation that provides/reply (offer/answer) model and prerequisite mechanism (precondition) of medium.In IMS, these two notions have very confidential relation.By media negotiation, use which kind of coded system to reach an agreement with regard to media combination and each medium that use in this session between two subscriber equipmenies.
Session Description Protocol (Session Description Protocol, abbreviation SDP) (offer/answer) model that provides/reply is used for conversation description is reached an agreement by two entities, for example should comprise parameters such as which encoding scheme, Media Stream in the session.Desirable conversation description is provided in providing the supplier, the respondent then in replying the viewpoint from the respondent indicate desirable conversation description.Provide/answer model can be used for creating session or revising existing session.For providing or replying of medium can be provided, there are some following restrictive conditions under which kind of situation:
(1) receives the client that provides new providing can not be provided again, respond, or refused this up to it and provide with replying up to it.
(2) produced the client that provides new providing can not be provided again, obtained original that replying of providing up to it, or be rejected up to original providing.
Prerequisite (precondition) then provides the process of resource reservation.When the calling subscriber send conversation request to the called subscriber after, the resource reservation of confirming local and calling subscriber's side all successfully before, called should ring.In order to accomplish this point, exchange prerequisite in the negotiations process that the calling and called both sides provide at SDP/reply each other.
Fig. 1 is that a kind of forward-shifting service in the IMS network is realized framework, wherein, application server is by CSCF (the Call Session Control Function of interface and user attaching network, be called for short CSCF) link to each other, service message between user terminal A, user terminal B and the user terminal C application server separately of can flowing through, application server can be by the business of various processing to realize enriching to service message.Utilize the service message exchange between the user terminal and consult the media parameter that both sides supported, between is set up Media Stream and is connected, and Media Stream is used to transmit data such as call voice bag.
Fig. 2 has used prerequisite (precondition) mechanism to set up the flow process of basic call in existing IETF (The Internet Engineering Task Force, the Internet engineering duty group) technical specification.Wherein, user terminal A and B support prerequisite.
Concrete steps among Fig. 2 are described as follows:
201, user terminal A sends the initial session request to user terminal B, carry the Offer medium in the initial session request, comprise in the medium user terminal A to parameters such as encoding scheme, Media Streams as prerequisite (preconditions), before the network resource reservation based on moving speed success of end-to-end all directions, be before user terminal B can satisfy the prerequisite of user terminal A, user terminal A is not wished user terminal B ring;
202, user terminal B sends session 183 responses to user terminal A, carry the Answer medium in session 183 responses, user terminal B requires user terminal A to begin resource reservation, and require after user terminal A is successful to the resource reservation on the user terminal B direction, user terminal A is informing user terminal B at once;
203, user terminal A sends 183 Temporary Responses to user terminal B after receiving session 183 responses;
204, user terminal B returns Temporary Response and confirms to user terminal A;
205, after user terminal A is finished resource reservation, send the session updates request to user terminal B, carry the Offer medium in the session updates request, carried parameters such as encoding scheme after the resource reservation success, Media Stream in the medium;
206, user terminal B receives the Offer medium that pass through session updates request band of user terminal A, when finding that session is set up required prerequisite and all satisfied, user terminal B sends session updates and responds to user terminal A, carries the Answer medium in the session updates response;
207, user terminal B ring sends 180 rings and responds to user terminal A;
208, user terminal A sends 180 Temporary Responses to user terminal B;
209, user terminal B sends Temporary Response and confirms to user terminal A;
210, user terminal B off-hook sends initial session and responds to user terminal A;
211, after user terminal A is received user terminal B offhook message, send the initial session response confirmation to user terminal B, so far, user terminal A and user terminal B converse.
Under the IMS framework, different business realizes by different service servers, is exactly the server of realizing forward-shifting service as herein preceding commentaries on classics server.
Forward-shifting service can be divided into two classes: a class is when preceding the commentaries on classics taken place, the calling subscriber does not have and forwarding subscriber carried out media negotiation, be the media information that the calling subscriber does not also obtain forwarding subscriber, mainly comprise Call Forwarding Unconditional, Call Forwarding on mobile subscriber Not Reachable, unregistered preceding the commentaries on classics and divert when busy (network side declares busy and terminal is declared busy situation); Another kind of is when forward-shifting service triggers, and the calling subscriber carried out media negotiation with forwarding subscriber, and promptly the calling subscriber has obtained the media information of forwarding subscriber, as Call Forwarding No Reply, divert when busy (called subscriber's refusal is answered).
When the user contracts forward-shifting service, can under different conditions, trigger forward-shifting service.After professional the triggering, AS can change the targeted customer forward and send the request of preceding change of team words.
With the Call Forwarding No Reply is example, and the Call Forwarding No Reply business is a kind of of forward-shifting service, when the user contracts forward-shifting service, can trigger forward-shifting service under different conditions.After professional the triggering, AS can change the targeted customer forward and send the preceding change of team words request of having carried calling subscriber's medium, is used for carrying out media negotiation with preceding commentaries on classics targeted customer.The Call Forwarding No Reply business triggers in caller and called users media negotiation success back.When the signatory Call Forwarding No Reply of user was professional, behind the called terminal ringing, behind the no response timer expiry, preceding commentaries on classics can take place in signatory called subscriber.
Fig. 3 is the Call Forwarding No Reply operation flow in existing TISPAN (Telecommunications and Internet Converged Servicesand Protocols for Advanced Networking, the Telecommunications and Internet converged Services and Protocols for Advanced Networking of the advanced networks) technical specification.Wherein, the user terminal B Call Forwarding No Reply business of having contracted.Describe for simplifying flow process, among the figure CSCF of user terminal B and the CSCF of user terminal C are merged, be expressed as CSCF B/C.
Concrete steps among Fig. 3 are described as follows:
301～304, user terminal A is by CSCF and preceding commentaries on classics application server caller party terminal B;
305～306, user terminal B ring sends 180 responses to CSCF B, changes application server (changeing AS before the hereafter) before CSCF B is forwarded to it;
307, when current commentaries on classics AS received 180 responses, the no response timer picked up counting;
308～309, preceding commentaries on classics AS sends to user terminal A by the CSCF (CSCF A) of user terminal A with 180 responses;
310, user terminal B no response, the no response timer expiry triggers the Call Forwarding No Reply business;
311～312, after the professional triggering of Call Forwarding No Reply, preceding commentaries on classics AS asks to user terminal B by the CSCF transmission session cancellation of user terminal B;
313～314, user terminal B sends session cancellation response to preceding commentaries on classics AS by CSCF B;
315～316, user terminal B sends 487 responses to preceding commentaries on classics AS by CSCF B simultaneously;
317～318, preceding commentaries on classics AS will send 487 response confirmations to user terminal B after receiving 487 responses;
319～320, preceding commentaries on classics AS sends the request of preceding change of team words to preceding commentaries on classics target terminal user C by the CSCF of user terminal C;
321～324, user terminal C ring sends 180 rings and responds to user terminal A;
325～328, user terminal C off-hook sends initial session and responds to user terminal A;
329～332, after user terminal A is received the notice of user terminal C off-hook, send the initial session response confirmation, user terminal A and user terminal C conversation to user terminal C.
In Fig. 3, before if forward-shifting service triggers, the calling subscriber and the forwarding subscriber called user terminal B of forward-shifting service (promptly signatory) carried out media negotiation, it is the media information that the calling subscriber has obtained forwarding subscriber, at this moment, if preceding commentaries on classics AS has carried medium in the preceding change of team words request of changeing targeted customer's transmission forward, the problem of media negotiation oscillation just might appear, and the concrete reason of generation media negotiation oscillation is seen the description among Fig. 4.
Fig. 4 is the Call Forwarding No Reply business process map that media negotiation oscillation takes place, and user terminal A, B, C support prerequisite, and all needs resource reservation, the user terminal B Call Forwarding No Reply business of having contracted.Concrete steps among Fig. 4 are described as follows:
401～404, user terminal A is by CSCF A and preceding commentaries on classics AS caller party terminal B;
405, user terminal A and user terminal B use prerequisite to carry out the foundation of basic call, finish the reservation of resource, and its idiographic flow can be referring to Fig. 2;
406～407, user terminal B ring sends 180 responses to CSCF B, and CSCF B changes AS before it is forwarded to;
408, when current commentaries on classics AS received 180 responses, the no response timer picked up counting;
409～410, preceding commentaries on classics AS sends to user terminal A by CSCF A with 180 responses;
411, user terminal B no response, the no response timer expiry triggers the Call Forwarding No Reply business;
412～413, after the professional triggering of Call Forwarding No Reply, preceding commentaries on classics AS sends session cancellation request to user terminal B by CSCF B;
414～415, user terminal B sends session cancellation response to preceding commentaries on classics AS by CSCF B;
416～417, user terminal B sends 487 responses to preceding commentaries on classics AS by CSCF B simultaneously;
418～419, preceding commentaries on classics AS will send 487 response confirmations to user terminal B after receiving 487 responses;
420～421, the request of change of team words had been carried the medium of user terminal A to preceding commentaries on classics target terminal user C before preceding commentaries on classics AS sent by CSCF C in the request of preceding change of team words;
422～423, owing to carry medium in the session updates request, after change of team words were asked before then user terminal C received, according to the offer/answer model, the medium in the request of preceding change of team words can be used as offer, subsequently, user terminal C can send the medium of answer in session 183 responses, promptly in conversational response, carry the media information of self, comprise ability, attribute and/or the state etc. of medium, and this media information is offer;
424～425, after preceding commentaries on classics AS receives above-mentioned session 183 responses, can change into the session updates request to session 183 responses and send to user terminal A, carried the medium in 183 responses in the session updates request;
For user terminal C, the SDP in session 183 responses is answer, and at this moment for user terminal A, the medium in the session updates request are offer.That is to say same section medium, user terminal C thinks answer, and user terminal A is thought offer.
426～445, after this, user terminal A and user terminal C the Infinite Cyclic of media negotiation will occur, just the vibration of media negotiation in order to satisfy the offer/answer model.
As can be seen from Figure 4, the reason of media negotiation oscillation is, if preceding commentaries on classics AS has carried medium in the request of preceding change of team words, then according to the offer/answer model, medium in the request of preceding change of team words are offer, and the medium that carry in its 183 Temporary Response will be answer; But because calling subscriber and forwarding subscriber had carried out media negotiation, therefore can only carry out media negotiation by session updates request (UPDATE), and the medium in the session updates request can only be offer, therefore, before change AS when 183 Temporary Responses (answer) being changed into the session updates request send to user terminal A, just cause the inconsistent of same section medium, thereby caused media negotiation oscillation.
Therefore, be necessary to provide a kind of method to solve the problem that is similar to the media negotiation oscillation in the Call Forwarding No Reply business.
Summary of the invention
The technical problem to be solved in the present invention is to be example with the Call Forwarding No Reply, and the media consulation method in a kind of forward-shifting service is provided, and changes AS before making when triggering forward-shifting service, can control media negotiation, thereby avoid the vibration of media negotiation.
In order to address the above problem, the invention provides the media consulation method in a kind of forward-shifting service, set up in the process in session, the preceding application server that changes is when triggering forward-shifting service, carried out the mutual of media information by media negotiation if judge calling subscriber and called subscriber, the transmission of then described preceding commentaries on classics application server is not carried the preceding change of team words request of calling subscriber's medium to preceding commentaries on classics targeted customer.
Further, when the former because Call Forwarding No Reply of the triggering of described forward-shifting service or called subscriber's refusal are answered divert when busy, change application server before described and judge that described calling subscriber and called subscriber carried out the mutual of media information by media negotiation.
Further, change before described the targeted customer receive described before after the request of change of team words, based on the offer/answer model of medium, sending to the media information that carries self before described in the conversational response of commentaries on classics application server, and this media information is offer;
After the commentaries on classics application server is received described conversational response before described, send the session updates request to described calling subscriber, and the media information that carries in the described session updates request is offer.
Further, after described calling subscriber receives described session updates request, send the session updates carry self media information and respond to changeing application server before described, media information wherein is answer.
Further, described media information comprises ability, attribute and/or the state of the described preceding targeted customer's of commentaries on classics medium.
Further, described calling subscriber after sending described session updates and responding to preceding commentaries on classics application server, send carry self media information the session updates request to changeing the targeted customer before described, media information wherein is offer;
After changeing the above-mentioned session updates request that the targeted customer receives that described calling subscriber sends before described, send the session updates of carrying self media information and respond to described calling subscriber, media information wherein is answer.
Compared with prior art, method provided by the invention has solved the problem that may occur media negotiation oscillation in Call Forwarding No Reply in the prior art or divert when busy (the called subscriber's refusal is answered) business.
Description of drawings
Fig. 1 is that a kind of forward-shifting service in the IMS network is realized Organization Chart;
Fig. 2 uses prerequisite to set up the flow chart of basic call in the IETF technical specification;
Fig. 3 is the flow chart of the Call Forwarding No Reply business in the TISPAN technical specification;
Fig. 4 is the flow chart that the Call Forwarding No Reply business of media negotiation oscillation takes place;
Fig. 5 is the flow chart of the Call Forwarding No Reply business of the embodiment of the invention.
Embodiment
The core concept of the inventive method is: after the professional triggering of Call Forwarding No Reply, change the medium in the request of the preceding change of team words of AS control before utilizing, when judging that calling subscriber and forwarding subscriber had carried out media negotiation, medium during commentaries on classics targeted customer's preceding change of team words were asked before the preceding AS of commentaries on classics will issue are removed, and promptly send and talk about request to preceding commentaries on classics targeted customer with the preceding change of team of medium; Like this, after preceding commentaries on classics targeted customer receives the preceding change of team words request of not being with medium, will send session 183 responses to preceding commentaries on classics AS, at this moment, the medium in session 183 responses are offer, transfer the session updates request to 183 to by preceding commentaries on classics AS again and send to the calling subscriber; At this moment, for the calling subscriber, the medium in the session updates request also are offer.Thereby can avoid the media negotiation oscillation problem in the forward-shifting service.
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail.
See also Fig. 5, the user terminal A among Fig. 5, B and C support prerequisite mechanism, and all need resource reservation, wherein the user terminal B Call Forwarding No Reply business of having contracted.The idiographic flow of present embodiment is described as follows:
501～519, with step 401～419;
520～521, preceding commentaries on classics AS at first judges and triggers whether reason is Call Forwarding No Reply or divert when busy when triggering forward-shifting service, if the request of change of team words is not carried medium to preceding commentaries on classics target terminal user C before then sending in the request of preceding change of team words;
522～523, user terminal C sends the session 183 of carrying medium and responds to preceding commentaries on classics AS, and these medium are offer;
524～525, after the preceding AS of commentaries on classics receives that session 183 responds, because user terminal A and user terminal B had carried out media negotiation before, send to user terminal A so AS can only change into the session updates request for 183 responses of receiving, and the medium that carry in the session updates request are necessary for offer.So, user terminal A, the medium in the session updates request can only be offer;
526～527, user terminal A sends the session updates of carrying medium and responds to preceding commentaries on classics AS, and these medium are answer;
528～529, preceding commentaries on classics AS changes into 183 Temporary Responses and sends to user terminal C after receiving above-mentioned session updates response, and for user terminal C, the medium in 183 Temporary Responses are answer;
530～531, user terminal C sends Temporary Response and confirms to preceding commentariess on classics AS, and this Temporary Response is confirmed to be the affirmation that 524～525 session 183 is responded;
532～535, send session updates and respond to behind the preceding commentaries on classics AS, the session updates request that medium are carried in the user terminal A transmission is to user terminal C, and these medium are offer;
536～539, user terminal C sends the session updates of carrying medium and responds to user terminal A, and these medium are answer;
540～543, user terminal C ring sends 180 rings and responds to user terminal A;
544～547, user terminal C off-hook sends initial session and responds to user terminal A;
548～551, after user terminal A is received the notice of user terminal C off-hook, send the initial session response confirmation, user terminal A and user terminal C conversation to user terminal C.
Should be appreciated that accompanying drawing described herein is to be used to provide further understanding of the present invention, constitute the application's a part, illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.
Certainly; the present invention also can have other various embodiments; do not deviating from the present invention spirit and substantially under the situation; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (6)
1, the media consulation method in a kind of forward-shifting service, it is characterized in that, set up in the process in session, the preceding application server that changes is when triggering forward-shifting service, carried out the mutual of media information by media negotiation if judge calling subscriber and called subscriber, the transmission of then described preceding commentaries on classics application server is not carried the preceding change of team words request of calling subscriber's medium to preceding commentaries on classics targeted customer.
2, the method for claim 1 is characterized in that,
When the former because Call Forwarding No Reply of the triggering of described forward-shifting service or called subscriber's refusal are answered divert when busy, change application server before described and judge that described calling subscriber and called subscriber carried out the mutual of media information by media negotiation.
3, method as claimed in claim 1 or 2 is characterized in that,
Change before described the targeted customer receive described before after the request of change of team words, based on the offer/answer model of medium, sending to the media information that carries self before described in the conversational response of commentaries on classics application server, and this media information is offer;
After the commentaries on classics application server is received described conversational response before described, send the session updates request to described calling subscriber, and the media information that carries in the described session updates request is offer.
4, method as claimed in claim 3 is characterized in that, after described calling subscriber receives described session updates request, sends the session updates carry self media information and responds to changeing application server before described, and media information wherein is answer.
5, method as claimed in claim 3 is characterized in that, described media information comprises ability, attribute and/or the state of the described preceding targeted customer's of commentaries on classics medium.
6, as claim 4 or 5 described methods, it is characterized in that,
Described calling subscriber after sending described session updates and responding to preceding commentaries on classics application server, send carry self media information the session updates request to changeing the targeted customer before described, media information wherein is offer;
After changeing the above-mentioned session updates request that the targeted customer receives that described calling subscriber sends before described, send the session updates of carrying self media information and respond to described calling subscriber, media information wherein is answer.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100902946A CN101459897A (en) | 2008-04-17 | 2008-04-17 | Media negotiation method in forwarding service |
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| CNA2008100902946A CN101459897A (en) | 2008-04-17 | 2008-04-17 | Media negotiation method in forwarding service |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011017957A1 (en) * | 2009-08-14 | 2011-02-17 | 中兴通讯股份有限公司 | Method and apparatus for call proceeding in call control of application server |
| WO2011020370A1 (en) * | 2009-08-20 | 2011-02-24 | 中兴通讯股份有限公司 | Method and application server for obtaining the users' capability in third party call control |
| CN101998325A (en) * | 2009-08-25 | 2011-03-30 | 中兴通讯股份有限公司 | Calling method and device for indicating terminal media type |
| CN106658752A (en) * | 2015-11-03 | 2017-05-10 | 中国移动通信集团公司 | Communication resource confirmation method, device and system |
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2008
- 2008-04-17 CN CNA2008100902946A patent/CN101459897A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011017957A1 (en) * | 2009-08-14 | 2011-02-17 | 中兴通讯股份有限公司 | Method and apparatus for call proceeding in call control of application server |
| US8965973B2 (en) | 2009-08-14 | 2015-02-24 | Zte Corporation | Method and apparatus for call proceeding in call control of application server |
| CN101997848B (en) * | 2009-08-14 | 2015-05-20 | 中兴通讯股份有限公司 | Method and device for continuing call in call control of application server |
| WO2011020370A1 (en) * | 2009-08-20 | 2011-02-24 | 中兴通讯股份有限公司 | Method and application server for obtaining the users' capability in third party call control |
| CN101997839A (en) * | 2009-08-20 | 2011-03-30 | 中兴通讯股份有限公司 | Method and application server for acquiring user capability from third part call control |
| CN101997839B (en) * | 2009-08-20 | 2015-06-10 | 中兴通讯股份有限公司 | Method and application server for acquiring user capability from third part call control |
| CN101998325A (en) * | 2009-08-25 | 2011-03-30 | 中兴通讯股份有限公司 | Calling method and device for indicating terminal media type |
| CN106658752A (en) * | 2015-11-03 | 2017-05-10 | 中国移动通信集团公司 | Communication resource confirmation method, device and system |
| CN106658752B (en) * | 2015-11-03 | 2020-04-14 | 中国移动通信集团公司 | Communication resource confirmation method, device and system |
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Open date: 20090617 |