CN101997856A - Signaling message interaction method and application server - Google Patents
Signaling message interaction method and application server Download PDFInfo
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- CN101997856A CN101997856A CN2009101675732A CN200910167573A CN101997856A CN 101997856 A CN101997856 A CN 101997856A CN 2009101675732 A CN2009101675732 A CN 2009101675732A CN 200910167573 A CN200910167573 A CN 200910167573A CN 101997856 A CN101997856 A CN 101997856A
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Abstract
The invention discloses a signaling message interaction method and an application server. The method comprises the following steps: the application server receives a first message from a calling party and a second message from the called party, wherein the first message carries first media transmitted to the called party, the second message carries second media transmitted to the calling party, and the first media are different from the second media; the application server judges the type of the first media; and the first media are processed according to the type of the first media. The invention can prevent media negotiation abnormality in the early stage of conversation/formal conversation when the media carry out transmission and negotiation simultaneously.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of exchange method and application server of signaling message.
Background technology
IP Multimedia System (IP Multimedia Subsystem, abbreviate IMS as) be by third generation partner program (Third Generation Partner Ship Project, abbreviating 3GPP as) the 3G core net of definition is to the network architecture of complete IP network evolution, the communication system that it superposes on packet domain and is made up of business control device, customer data base, network interworking equipment etc. is used to provide IP multimedia service.
In the IMS system, key-course separates with operation layer, and particularly: key-course does not provide concrete business, only is responsible for providing to operation layer controlled function such as necessary triggering, routing and charging.The controlled function of key-course is to be finished by CSCF (Call Session Control Function abbreviates CSCF as).CSCF is divided into Proxy Call Session Control Function (Proxy Call Session Control Function, abbreviate P-CSCF as), query call conversation control function (Interrogating Call Session Control Function, abbreviate I-CSCF as) and three types of service call conversation control functions (Serving Call Session Control Function abbreviates S-CSCF as).Operation layer is made up of a series of application servers (Application Server abbreviates AS as), and concrete business service can be provided, and AS can be an independent entity, also may reside among the S-CSCF.S-CSCF triggers according to the control of user's CAMEL-Subscription-Information is professional, and the business on the AS called is to realize concrete business function.AS and S-CSCF can be referred to as service equipment (Server Equipment abbreviates SE as).End-to-end equipment in the session is called subscriber equipment (User Equipment abbreviates UE as), is responsible for mutual with the user.In IMS, use initial session protocol (Session Initiation Protocol abbreviates SIP as) to carry out communication between each functional entity.
SIP is the signaling control protocol of application layer, is used to create, revise and discharge one or more participants' session.For the loading condition and the characteristics of describing message content, SIP uses the Session Description Protocol (Session Description Protocol abbreviates SDP as) of Internet to describe the characteristics of terminal equipment.The SDP agreement can be transmitted medium stream information in media session, allow the recipient of conversation description to participate in session.In media session, can be divided into early-session (Early Session) and formal session (Regular Session, abbreviate Session as), the medium that use are respectively medium (Early Media) early, for example ring-back tone, CRBT sound and stand by tone etc. and the conversation medium (Regular Media).
Below specify the implementation of Early Media, RFC3960 has defined two kinds of implementations at Early Media, is respectively Gateway pattern and Application Server pattern, particularly:
The Gateway pattern is finished the mutual of Early Media by set up Early Session before final response, usually medium can be realized by interim reliable response PRACK and UPDATE alternately, but, may there be Media Clipping in the Gateway pattern in Forking, therefore, in order to reach the effect of traditional PSTN network, calling terminal needs complicated local sound reproduction strategy.The situation of Early and Regular medium can not be distinguished except calling terminal, Application server pattern should be preferably adopted.
Application Server pattern is passed through at subscriber proxy server end (User Agent Server, abbreviate UAS as) and User Agent Client (User Agent Client, abbreviate UAC as) between set up the Early Session separate with the Session session session to finish medium mutual, Early Session and Session carry out media negotiation respectively, when arriving, the Session medium switch to the Session medium, perhaps, switch to the Session medium when on signaling, receiving 200 OK, can guarantee not lose the Session medium.Application Server pattern is to carry out Early Session and Session media negotiation under same Dialog condition, angle from end side, be on Early Session and Session media port, to hold consultation respectively and resource reservation, from the angle of AS side, can transmit and consult by using different affairs signaling messages to carry two sections medium respectively in that same Dialog is next.If but do not support parallel eventful affair at the Session Initiation Protocol stack, promptly the Session Initiation Protocol stack can only be handled under the situation of affairs at one time, carries being easy to generate conflict alternately of signaling message of two sections medium and causes media negotiation unusual.
In sum, do not cause the unusual problem of media negotiation, do not propose effective solution at present as yet under the Session Initiation Protocol stack is not supported the situation of parallel eventful affair, carrying being easy to generate conflict alternately of signaling message of two sections medium in the correlation technique.
Summary of the invention
Under the Session Initiation Protocol stack is not supported the situation of parallel eventful affair, carry being easy to generate conflict alternately of signaling message of two sections medium and cause the unusual problem of media negotiation and propose the present invention at what exist in the correlation technique, for this reason, main purpose of the present invention is to provide a kind of exchange method and application server of signaling message, one of to address the above problem at least.
To achieve these goals, according to an aspect of the present invention, provide a kind of exchange method of signaling message.
Exchange method according to signaling message of the present invention comprises: application server receives from first message of caller with from the second called message, wherein, first message carries and is sent to the first called medium, second message carries second medium that are sent to caller, and first medium are different from second medium; Application server is judged the type of first medium; Type according to first medium is handled first medium.
Preferably, application server judges that the type of first medium comprises: judge that first medium are for replying the class medium or for the class medium are provided.
Preferably, according to the type of first medium first medium are handled and comprised: judging first medium is to reply under the situation of class medium, application server buffer memory first medium; Perhaps judge first medium for the situation that the class medium are provided under, application server rollback first medium.
Preferably, application server rollback first medium comprise: application server sends the rollback message of the information that carries the indication stand-by period to first medium, wherein, the stand-by period is the shortest stand-by period that caller is allowed to initiate to application server once more the signaling request message.
Preferably, after according to the type of first medium first medium being handled, said method also comprises: application server sends the message that carries second medium to caller.
Preferably, be to reply under the situation of class medium at first medium, after the caller transmission carried the message of second medium, said method also comprises: application server carried the message of first medium to called transmission at application server.
Preferably, first medium are formal conversation media, and second medium are the early-session medium; Perhaps, first medium are the early-session medium, and second medium are formal conversation media.
To achieve these goals, according to another aspect of the present invention, provide a kind of application server.
Application server according to the present invention comprises: receiver module, be used to receive from first message of caller with from the second called message, wherein, first message carries and is sent to the first called medium, second message carries second medium that are sent to caller, and first medium are different from second medium; Judge module is used to judge the type of first medium; Processing module is used for according to the type of first medium first medium being handled.
Preferably, processing module comprises: first processing sub, and being used at first medium is to reply buffer memory first medium under the situation of class medium; Second processing sub, be used for first medium for the situation that the class medium are provided under rollback first medium.
Preferably, application server also comprises: sending module is used for sending the message that carries second medium to caller after processing module handles first medium.
By the present invention, employing is carried out buffer memory or rollback to the early-session/formal conversation media from caller, solved and under the Session Initiation Protocol stack is not supported the situation of parallel eventful affair, do not carried being easy to generate conflict alternately of signaling message of two sections medium and cause the unusual problem of media negotiation, session in early days/formal conversation media transmit simultaneously and the situation of consulting under prevent the generation that media negotiation is unusual.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and 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.In the accompanying drawings:
Fig. 1 is the flow chart according to the exchange method of the signaling message of the embodiment of the invention;
Fig. 2 is the application scenarios schematic diagram of the exchange method of the signaling message of example according to the present invention;
Fig. 3 is the signaling process figure of the exchange method of the signaling message of example according to the present invention;
Fig. 4 is the structured flowchart according to the application server of the embodiment of the invention;
Fig. 5 is the structured flowchart according to the application server processes module of the embodiment of the invention.
Embodiment
Functional overview
Consider problems of the prior art, the embodiment of the invention provides a kind of interaction schemes of signaling message, to solve the conflict of consulting unusual thereby be used for controlling in the signaling that the AS side is carried out media negotiation for terminal, the treatment principle of this scheme is as follows: application server receives from first message of caller with from the second called message, wherein, first message carries and is sent to the first called medium, second message carries second medium that are sent to caller, and first medium and second medium are inequality; Application server is judged the type of first medium; Type according to first medium is handled first medium.Whether this scheme is judged according to existing the Early Session/Session caller medium that send in the called medium of Session/Early Session that also need send to caller and the caller to carry out integrated decision-making, and control, control for signaling when holding consultation respectively and avoid the signaling conflict using Application Server pattern to carry out Early Session and Session medium thereby change AS before can making.
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Method embodiment
According to embodiments of the invention, provide a kind of exchange method of signaling message.Fig. 1 is the flow chart according to the exchange method of the signaling message of the embodiment of the invention, and as shown in Figure 1, this method comprises that following step S102 is to step S106:
Step S102, application server receives from first message of caller with from the second called message, wherein, first message carries and is sent to the first called medium, second message carries second medium that are sent to caller, first medium and second medium are inequality, particularly, first medium are formal conversation media, and second medium are the early-session medium, perhaps first medium are the early-session medium, second medium are formal conversation media, for example, and in actual applications, AS judges that existence also need send to the called medium of Session/Early Session of caller, judges simultaneously to have the Early Session/Session caller medium that send in the caller.In actual applications, above-mentioned first message and second message can be sip message, that is, above-mentioned first message and second message can be specially first sip message and second sip message, can be other message that can carry above-mentioned medium, the embodiment of the invention does not limit this yet.
Step S104, application server is judged the type of first medium, wherein, the type of first medium can be for replying the class medium or the class medium being provided, and promptly AS judges that the Early Session/Session caller medium that send in the caller are Answer medium or Offer medium.
Step S106 handles first medium according to the type of first medium, particularly, judges that at application server first medium are to reply under the situation of class medium, application server buffer memory first medium; Perhaps type that application server is judged first medium for the situation that the class medium are provided under, application server rollback first medium, application server rollback first medium are specially: application server sends the rollback message of the information that carries the indication stand-by period to first medium, wherein, the stand-by period is the shortest stand-by period that caller is allowed to initiate to application server once more the signaling request message.After according to the type of first medium first medium being handled, application server sends the message that carries second medium to caller.In actual applications, if AS judges that the Early Session/Session caller medium that send in the caller are Answer medium, these Answer caller medium of buffer memory then, then carrying the called medium of Session/Early Session by suitable SIP affairs signaling message sends to caller, reach the requirement of consulting two sections medium simultaneously respectively, perhaps, if AS judges that the Early Session/Session medium that send in the caller are Offer medium, then send 500 message to caller, then carrying the called medium of Session/Early Session by suitable SIP affairs signaling message sends to caller, reaches the requirement of consulting two sections medium simultaneously respectively.Above-mentioned 500 message comprise the Retry-After head, and time value is 0 to 10S optional value, and in Retry-After field designated time intervals, calling terminal should not transmit any other signaling request to this application server AS; When the time of Retry-After head indication arrived, calling terminal resend the corresponding signaling request of carrying medium and arrives AS, and the decision-making of end side is depended in the transmission of signaling at this moment.
Further, be to reply under the situation of class medium in the type of first medium, application server to caller send carry the initial session protocol signaling message of second medium after, application server carries the message of first medium to called transmission.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Fig. 2 is the application scenarios schematic diagram of the exchange method of the signaling message of example according to the present invention, Fig. 3 is the signaling process figure of the exchange method of the signaling message of example according to the present invention, is specially under the non-parallel eventful affair Session Initiation Protocol stack situation to use Application Server pattern to finish the process of calling.To be described the instantiation of Call Forwarding No Reply business based on scene shown in Figure 2 and in conjunction with Fig. 3 below, and the method that the embodiment of the invention provides will be described as example.Need to prove, omit preceding commentaries on classics AS and the related news of subscriber equipment B, subscriber equipment C among Fig. 3.
1. subscriber equipment A calls out B, to its CSCF initiate a session request (session);
2. the CSCF of subscriber equipment A is to the CSCF that is used for B initiate a session request (session);
3. the CSCF of subscriber equipment B changes AS initiate a session request (session) forward;
4. preceding commentaries on classics AS is to the CSCF of subscriber equipment B initiate a session request (session);
5. the CSCF of subscriber equipment B changes 180 responses (early session) of AS initiation session forward;
6. preceding commentaries on classics AS is to 180 responses (early session) of the CSCF of subscriber equipment B initiation session;
7. the CSCF of subscriber equipment B is to 180 responses (early session) of the CSCF of subscriber equipment A initiation session;
8. the CSCF of subscriber equipment A is to 180 responses (early session) of subscriber equipment A initiation session;
9. subscriber equipment A is to the CSCF of subscriber equipment A initiation session prack request (early session);
10. the CSCF of subscriber equipment A is to the CSCF of subscriber equipment B initiation session prack request (early session);
11. the CSCF of subscriber equipment B changes AS initiation session prack request (early session) forward;
12. preceding commentaries on classics AS is to the CSCF of subscriber equipment B initiation session prack request (early session);
13. behind the preceding commentaries on classics AS no answer timeout, initiate a session request (session) the preceding C that forwards to the CSCF of subscriber equipment B;
14. the CSCF of subscriber equipment B is to the CSCF of subscriber equipment C initiate a session request (session);
15. the CSCF of subscriber equipment C is finally to subscriber equipment C initiate a session request (session);
16. subscriber equipment C is to 183 responses (early session, session) of the CSCF of subscriber equipment C initiation session;
17. the CSCF of subscriber equipment C is to 183 responses (early session, session) of the CSCF of subscriber equipment B initiation session;
18. the CSCF of subscriber equipment B is to preceding commentaries on classics AS initiation session 183 responses (early session, session) of subscriber equipment B;
19.Early-Session and after Session carried out media negotiation respectively, preceding the commentariess on classics AS of subscriber equipment B asked (early session) to the CSCF of subscriber equipment B initiation session update;
20. the CSCF of subscriber equipment B is to the CSCF of subscriber equipment A initiation session update request (early session), preceding commentaries on classics AS (B) transmits the Offer medium of Early-Session to A by conversation request message;
21. the CSCF of subscriber equipment A is to subscriber equipment A initiation session update request (early session);
22. subscriber equipment A is to the CSCF of subscriber equipment A initiation session 200OK response (early session);
23. the CSCF of subscriber equipment A is to subscriber equipment A initiation session 200OK response (early session);
24. the CSCF of subscriber equipment B is to the preceding commentaries on classics AS initiation session 200OK response (early session) of subscriber equipment B, that is, the Answer response message of initiating Early-Session is to preceding commentaries on classics AS (B), this caller of AS buffer memory Answer medium;
25. subscriber equipment A is to the CSCF of subscriber equipment A initiation session update request (early session);
26. the CSCF of subscriber equipment A is to the CSCF of subscriber equipment B initiation session update request (early session);
27. the CSCF of subscriber equipment B changes AS initiation session update request (early session) forward, particularly, the Offer request message of initiating Early-Session is to preceding commentaries on classics AS (B);
28. the preceding commentaries on classics AS of subscriber equipment B initiates the above-mentioned Offer request message of 500 (Retry-After) message rollback to the CSCF of subscriber equipment B;
29. the CSCF of subscriber equipment B initiates 500 (Retry-After) message to the CSCF of subscriber equipment A;
30. the CSCF of subscriber equipment A initiates 500 (Retry-After) message to subscriber equipment A;
31. the preceding commentaries on classics AS of subscriber equipment B is to 183 responses (session) of the CSCF of subscriber equipment B initiation session;
32. the CSCF of subscriber equipment B is to 183 responses (session) of the CSCF of subscriber equipment A initiation session;
33. the CSCF of subscriber equipment A is to 183 responses (session) of subscriber equipment A initiation session.
Above-mentioned steps 31 to step 33 is that the preceding commentaries on classics AS of subscriber equipment B passes through the Answer medium of conversational response forwards Session to subscriber equipment A.
And in the time interval, UE does not transmit a request to original server end to calling terminal A at Retry-After.
Device embodiment
According to embodiments of the invention, provide a kind of application server.Fig. 4 is the structured flowchart according to the application server of the embodiment of the invention.As shown in Figure 4, above-mentioned application server comprises: receiver module 42, be used to receive from first message of caller with from the second called message, wherein, first message carries and is sent to the first called medium, second message carries second medium that are sent to caller, and first medium are different from second medium; Judge module 44 is connected in receiver module 42, is used to judge the type of first medium; Processing module 46 is connected in judge module 44, is used for according to the type of first medium first medium being handled.
Fig. 5 is the structured flowchart according to the application server processes module of the embodiment of the invention.As shown in Figure 5, processing module comprises: first processing sub 52, and being used at first medium is to reply buffer memory first medium under the situation of class medium; Second processing sub 54, be used for first medium for the situation that the class medium are provided under rollback first medium.
Preferably, application server can also comprise: sending module is used for sending the message that carries second medium to caller after processing module handles first medium.
The interaction schemes of the signaling message that the embodiment of the invention provides can not supported under the parallel eventful affair condition at the Session Initiation Protocol stack, use the media consulation method of Application Server pattern simultaneously, session in early days/formal conversation media transmit simultaneously and the situation of consulting under can prevent the generation that media negotiation is unusual.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the exchange method of a signaling message is characterized in that, described method comprises:
Described application server receives from first message of caller with from the second called message, wherein, described first message carries and is sent to the described first called medium, described second message carries second medium that are sent to described caller, and described first medium are different from described second medium;
Described application server is judged the type of described first medium;
Type according to described first medium is handled described first medium.
2. method according to claim 1 is characterized in that, described application server judges that the type of described first medium comprises:
Judge that described first medium are for replying the class medium or for the class medium are provided.
3. method according to claim 2 is characterized in that, described type according to described first medium is handled described first medium and comprised:
Judging described first medium is under the described situation of replying the class medium, described first medium of described application server buffer memory; Perhaps
Judge described first medium for the described situation that the class medium are provided under, described first medium of described application server rollback.
4. method according to claim 3 is characterized in that, described first medium of described application server rollback comprise:
Described application server sends the rollback message that carries the information of indicating the stand-by period to described first medium, and wherein, the described stand-by period is the shortest stand-by period that described caller is allowed to initiate to described application server once more the signaling request message.
5. according to the method described in the claim 3, it is characterized in that after according to the type of described first medium described first medium being handled, described method also comprises:
Described application server sends the message that carries described second medium to described caller.
6. method according to claim 5 is characterized in that, is under the described situation of replying the class medium at described first medium, described application server to described caller send carry the message of described second medium after, described method also comprises:
Described application server carries the message of described first medium to described called transmission.
7. according to each described method in the claim 1 to 6, it is characterized in that,
Described first medium are formal conversation media, and described second medium are the early-session medium; Perhaps,
Described first medium are the early-session medium, and described second medium are formal conversation media.
8. an application server is characterized in that, comprising:
Receiver module, be used to receive from first message of caller with from the second called message, wherein, described first message carries and is sent to the described first called medium, described second message carries second medium that are sent to described caller, and described first medium are different from described second medium;
Judge module is used to judge the type of described first medium;
Processing module is used for according to the type of described first medium described first medium being handled.
9. application server according to claim 8 is characterized in that, described processing module comprises:
First processing sub, being used at described first medium is to reply described first medium of buffer memory under the situation of class medium;
Second processing sub, be used for described first medium for the situation that the class medium are provided under described first medium of rollback.
10. according to Claim 8 or 9 described application servers, it is characterized in that described application server also comprises:
Sending module is used for sending the message that carries described second medium to described caller after described processing module handles described first medium.
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| CN200910167573.2A CN101997856B (en) | 2009-08-26 | 2009-08-26 | Signaling message interaction method and application server |
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| CN101242564A (en) * | 2007-02-05 | 2008-08-13 | 田蕊 | Broadcasting and receiving method for mobile wireless self-organized network message and applied terminal node |
| CN101448221B (en) * | 2008-04-02 | 2011-05-25 | 中兴通讯股份有限公司 | Method for call state for supporting early-session |
| CN101340384B (en) * | 2008-08-12 | 2011-01-05 | 中兴通讯股份有限公司 | Method for implementing one-number-business resonance service and adopted application server |
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