CN101030964B - Session controller and controlling method - Google Patents

Session controller and controlling method Download PDF

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Publication number
CN101030964B
CN101030964B CN 200610056807 CN200610056807A CN101030964B CN 101030964 B CN101030964 B CN 101030964B CN 200610056807 CN200610056807 CN 200610056807 CN 200610056807 A CN200610056807 A CN 200610056807A CN 101030964 B CN101030964 B CN 101030964B
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request
session
dialogue
release
call
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CN101030964A (en
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李辉
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN 200610056807 priority Critical patent/CN101030964B/en
Priority to PCT/CN2007/000698 priority patent/WO2007098714A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/142—Managing session states for stateless protocols; Signalling session states; State transitions; Keeping-state mechanisms

Abstract

The method comprises: 702) according to the initial filter rule in the users' subscription data, triggering the session request to one or more application server, and saving all session information relating to the session request and passing through the calling session control function entity; 704) when releasing the session, according to the saved session information relating the session request, releasing the session.

Description

Session control device and method
Technical field
The present invention relates to communicator and method, relate in particular to session control device and method in the network.
Background technology
Session initiation Protocol (Session Initiation Protocl is called for short SIP) is the standard of internet engineering task group (IETF) in a kind of VoIP of in March, 1999 issue.Session initiation Protocol has increased the important application of phone as internet (Internet) requirement of telephone signaling and service quality (Quality of Service is called for short QoS) aspect, and has had the unique user's addressing and the function of location.Recently the practical function of Session initiation Protocol head and shoulders above the application of VoIP.Session initiation Protocol is the agreement of telephone signaling, be used for initiation session, can control the foundation and the termination of the Multimedia session of a plurality of participants' participation, and can dynamically adjust and revise session attribute, such as the code/decode format of session bandwidth requirement, transmission medium type (voice, video, data etc.), medium, to support of multicast and clean culture etc.Therefore, Session initiation Protocol helps combining with the internet value-added service of the multiple application of exploitation.
IM CN subsystem (IP Multimedia Subsystem is called for short IMS) is a 3rd Generation Partnership Project (3 RdGeneration PartnershipProiect, be called for short 3GPP) subsystem of stack on packet network, adopt the bearer path of packet domain as its control signaling and media delivery, introduce Session initiation Protocol as professional control protocol, utilize simple, the easy expansion of Session initiation Protocol, media combination characteristics easily, by business control is separated with carrying control, provide abundant multimedia service.IP multimedia core network subsystem architecture as shown in Figure 1, the major function entity of IM CN subsystem framework comprises: be used to control user's registration, the call conversation control function entity of functions such as session control (Call Session Control Function, be called for short CSCF) 102, be used to manage concentratedly home subscriber server (the Home SubscriberServer of user contracting data, be called for short HSS) 104, be used to provide application server (the Application Server of miscellaneous service logic control function, be called for short AS), be used to select the PSTN/CS territory to interrupt interruption gateway control function (BGCF) entity 106 of the network of generation, be used to control MGCF (MediaGate Control Function the is called for short MGCF) entity 108 of media gateway and circuit domain/PSTN/ flexible exchanging network intercommunication, be used for control box and handle Multimedia resource function controller (MRFC) (MRFC) 110 and the Multimedia resource function processor (MRFP) (MRFP) 112 of the media stream resources of packet domain, act on behalf of SCSF (P-CSCF) 114, be used to provide signatory locator function (SLF) entity 116 of the query function of the signatory home subscriber server of user.Wherein, there is obtaining of information on the road between Cx interface support call conversation control function entity and the home subscriber server, by the information between call conversation control function entity tunnel transmission user and home subscriber server, adopts Diameter.Dx is the interface between call conversation control function entity and the signatory locator function entity, and being used to obtain is the address that a given user keeps the home subscriber server of contracting.The flow process that registration between main transmission user of Gm and the call conversation control function entity is relevant, customer service is controlled, authentication is relevant.Mg is the interface between MGCF entity and the call conversation control function entity, based on the 3GPP Session initiation Protocol.Signaling MGCF entity was talked about in the change of team before the gateway control function entity was interrupted in the Mj permission, so that arrive the mutual of PSTN (Public Switched Telephone Network, PSTN), dialogue-based initiation protocol.Change of team words signaling was interrupted gateway control function entity, dialogue-based initiation protocol to another before Mk allowed call conversation control function entity.Mm is the IP interface between call conversation control function entity and the IP network, is used for the business control of IP multimedia service, and for example, VOIP call control server or the terminal on the IP network from IP network receive a call request.The media stream resources that Mp allows Multimedia resource function controller (MRFC) control MRF to provide meets standard H.248 fully and has increased the expansion of 3GPP.Mr allows mutual between call conversation control function entity and the Multimedia resource function controller (MRFC), based on the 3GPP Session initiation Protocol.
The IM CN subsystem network uses Session initiation Protocol to register, and realizes that the user inserts the IM CN subsystem network.In user registration course, the IM CN subsystem network authenticates and sets up the input field escape way at IP multimedia private identity, user registration success will be at home domain S-CSCF (Serving-Call SessionControl Function, service-call session control function) entity 102 is set up the relation between IP multimedia pUblic identity and this user's current location, and S-CSCF takes off user's subscription data simultaneously from home subscriber server 104.
In the IM CN subsystem that S-CSCF downloads is signatory, can comprise one or more business description (Service Profile).Business description comprises information such as public identifier, core net service authorization, inceptive filtering rule set, shared inceptive filtering rule set.Initial filter criteria wherein is one group of user's a service parameter.A business description can comprise the tabulation that a plurality of initial filter criteria are formed.
A triggering rule comprises following information: the application server address that is triggered, the priority of triggering rule, trigger point, default process, optional information on services.
According to these parameters, S-CSCF receives the request message coupling according to the trigger message in the trigger point with from Mw according to the priority of triggering rule from high to low.If the match is successful, S-CSCF sends the application server of relevant request to the match triggers rule by ISC interface.
If what receive is a registration message, S-CSCF sends third-party registration message for the application server of each match triggers rule.
If what receive is other request, S-CSCF sends in the message at the application server of giving each match triggers rule, adds special identifier and routing iinformation.Application server according to routing iinformation, returns to S-CSCF with request message after the service logic of finishing dealing with.S-CSCF will proceed the triggering rule coupling of low priority, until all the triggering rule inspections in the business description are finished.
Provide professional alternately by ISC interface between S-CSCF and the application server in the IM CN subsystem, its framework is shown in Figure 2.Wherein, application server can be following type:
1, session initiation protocol application server (SIP AS) 202: some service can be provided, can be based on Session initiation Protocol session of service impact.
2, IP multimedia service handoff functionality (IP Multimedia Services SwitchingFunction, be called for short IM SSF) 204: this is the application server of a specific type, it is the characteristic (for example: trigger the finite state machine of DP point, CAMEL service exchange etc.) that is used for being responsible for CAMEL (service network enhancing logic) net, and it provides a CAP interface.
3, service capability server (the Open ServicesAccess-Service Capability Server of open service access, be called for short OSA-SCS) 206: it provides an interface to the application server (OSA AS) 208 that open service inserts, and it is inserted the IM subsystem for third party's safety a standard mode is provided.The OSA frame of reference has defined the application server entity that an open service inserts, and it provides a logic execution environment by OSA API (ApplicationProgram Interface, application programming interfaces) for the application of client.The definition of the application server of open service access here is different from the definition that the application server of service above is provided to IM CN subsystem, promptly, the application server of IM CN subsystem is mutual by internal services control interface (InternalService Control Interface is called for short ISC interface) and S-CSCF.
All application servers (comprising the service capability server that IP multimedia service handover (mih) functions (IPMultimedia Services Switching Function is called for short IM-SSF) and open service insert) all are the behaviors of carrying out a session initiation protocol application server on ISC interface.
Application server can adopt following several model to handle the Session initiation Protocol request.
1, application server is as termination user agent (User Agent is called for short UA)
As shown in Figure 3, application server 302 is carried out termination user agent or Redirect Server role.Under this operation model, S-CSCF 304 passes to application server 302 with the Session initiation Protocol request of receiving, termination user agent or Redirect Server role that application server 302 is carried out definition among the RFC 3261.
2, application server is as PROXY (agency)
As shown in Figure 4, application server 302 is carried out Session initiation Protocol agency's role.Under this operation model, S-CSCF 304 gives application server 302 with the Session initiation Protocol request broker of receiving, the PROXY role that application server 302 is carried out definition among the IETF RFC 3261 returns request broker to S-CSCF 304, and S-CSCF 304 these message of agency are given the destination then.In the agent operation process, application server 302 can be according to the rule of the PROXY that describes among the IETF RFC 3261, the header field content in increase, deletion and the request of modification Session initiation Protocol.
Under this model, application server 302 can also pass through to S-CSCF 304 booking reader's equipment registered events of (User Equipment is called for short UE), obtains all contact addresses of subscriber equipment, and subscriber equipment is initiated bifurcated (Forking).Forking is Proxy serial or parallel a kind of processing mode to a plurality of terminal initiation session.
3, application server 302 is as back-to-back user agent (Back-to-Back UserAgent is called for short B2BUA)
As shown in Figure 5, application server 302 is as the route back-to-back user agent.Application server receives a request from S-CSCF, the termination request, and based on the new request of request generation that receives.
Under this operation model, the Session initiation Protocol request that receives is acted on behalf of application server by S-CSCF 304, application server 302 generates a new session initiation protocol request of a different Session initiation Protocol session, and sending to S-CSCF, S-CSF arrives the destination with this request broker then.Under this model, the role that application server 302 is carried out the back-to-back user agent of a plurality of Session initiation Protocol sessions of describing among the IETFRFC 3261.
Under this model, change processing before application server 302 can carry out according to the needs of business or the open identity of a plurality of IP multimedias (IP Multimedia Public Identity is called for short IMPU) is initiated request.
According to 3GPP TS 24.229, existing session processing mode is as follows:
One, serviced Client-initiated request processing procedure:
By serviced Client-initiated request, when S-CSCF when service-user or PSI receive the request of the initial request of dialogue or independent sessions, before the request of transmitting, S-CSCF should:
1, checks that the original dialogue sign whether S-CSCF was placed in the Route header field in the past is present in the highest item that the Route header field is asked in arrival.
A) if there is no, it represents that this request is to visit this S-CSCF for the first time;
B) if exist, it has represented and the getting in touch of an existing dialogue, this request be from application server send for previous transmission request responding.
2, take out the initial filter criteria of the public identifier correspondence in the P-Asserted-Identity header field in this request message.According to priority orders, check whether this initial request is complementary with the unenforced initial filter criteria of next bar.If coupling, S-CSCF in the Route header field the highest own user resource identifier (Uniform ResourceIdentifier, abbreviation URI) afterwards, the AS URI that insertion will be got in touch transmits this and asks that application server.If do not match, S-CSCF then checks the match condition of the filtering rule of remaining lower priority, has checked until all initial filter criteria, handles the destination address of request message then; Before the processing intent address, S-CSCF may get in touch one or more application servers;
If the highest item does not have the original dialogue sign in the 3 Route header fields, S-CSCF preserves icid parameter that receives from the P-Charging-Vector header field and the icid parameter that keeps the P-Charging-Vector header field.Alternatively, S-CSCF can produce new, a icid that the overall situation is unique and new numerical value is inserted in the icid parameter of P-Charging-Vector header field with this when transmitting this message.If S-CSCF generates new icid, it will have a responsibility for safeguarding this two icid numerical value in subsequent communications so;
4, during S-CSCF processing intent address,, use the URI in the highest Route header field to decide destination address if exist, otherwise just based on Request-URI;
If 5 these requests are INVITE requests, S-CSC preserve the Contact, the Cseq that from request, receive and Record-Route header field numerical value so that when needing S-CSCF can discharge this dialogue.
Two, the request processing procedure of serviced user's termination:
When S-CSCF receives the request of the initial request of the dialogue of mailing to static prefabricated PSI or registered service-user or standalone transaction, before transmitting this request, S-CSCF should:
1, checks that the original dialogue sign whether S-CSCF was placed in the Route header field in the past is present in the highest item that the Route header field is asked in arrival.
A) if there is no, it represents that this request is to visit this S-CSCF for the first time, the Request-URI of the S-CSCF request of will preserving at this moment;
B) if exist, it has represented and the getting in touch of an existing dialogue, this request be from application server send for previous transmission request responding.
If the sign of the original dialogue in the 2 Route header fields exists, check whether this Request-URI equates with the Request-URI that has preserved.If do not match, then S-CSCF should:
If a) this request is the INVITE request, Contact, Cseq that preservation receives from request and Record-Route header field are so that S-CSCF can discharge this dialogue when needed; And
B) transmit this request and skip following step based on this Request-URI;
3, take out the initial filter criteria of the public identifier correspondence in the Request-URI header field in this request message.According to priority orders, check whether this initial request is complementary with the unenforced initial filter criteria of next bar.If coupling, after the URI of S-CSCF the highest oneself in the Route header field, insertion will be got in touch AS URI, transmit this and ask that application server.If do not match, S-CSCF then checks the match condition of the filtering rule of remaining lower priority, has checked until all initial filter criteria, handles the destination address of request message then; Before the processing intent address, S-CSCF may get in touch one or more application servers;
If the highest item does not have the original dialogue sign in the 4 Route header fields, S-CSCF preserves icid parameter that receives from the P-Charging-Vector header field and the icid parameter that keeps the P-Charging-Vector header field.
If 5 these requests are INVITE requests, S-CSC preserve the Contact, the Cseq that from request, receive and Record-Route header field numerical value so that when needing S-CSCF can discharge this dialogue.
Three, serviced user discharges the session processing procedure:
When the inner indication of S-CSCF session discharges (for example registration timer is overtime, management logging off users etc.), S-CSCF sends the relevant dialogue that the CANCEL cancellation is being set up according to RFC3261, perhaps sends BYE and discharges the session of having set up.
The method that sends BYE is as follows:
1, according to the dialog information of preserving, for the called subscriber constructs first BYE request;
2, according to the dialog information of preserving, for the calling subscriber constructs second BYE request;
If 3 S-CSCF at Calling Side, are used as first BYE message as the Message Processing that receives from the calling subscriber, send to professional control, further be forwarded to the called subscriber according to the result.
If 4 S-CSCF at Calling Side, directly are dealt into the calling subscriber with second BYE message.
If 5 S-CSCF at callee side, directly are dealt into the called subscriber with first BYE message.
If 6 S-CSCF at callee side, are used as second BYE message as the Message Processing that receives from the called subscriber, send to professional control, further be forwarded to the calling subscriber according to the result.
There is following problem in the prior art:
1, during the network logging off users, S-CSCF can not discharge all dialogues of this user's current business control.
2, after S-CSCF receives the release message of application server, can't judge whether that needs discharge the dialogue of all application servers that are triggered of this business control.
For example, the control of the business of a conversation request is triggered to three application servers at S-CSCF, and wherein first application server is the IP multimedia service handover (mih) functions, and the with good grounds session release message of this user triggers the business of a new session; Second application server is IMS-GWF (online charging gateway), need can discharge all dialogues of current business control at any time according to user's charge information; The 3rd is a back-to-back user agent role's application server, and this user has called control professional.After all session establishments of business control are finished:
If home subscriber server management logging off users, S-CSCF discharges session according to existing standard, because there is service logic in application server, can not discharge all dialogues.
If owing to the charging reason, online charging gateway IMS-GWF need discharge session, sends BYE message to the session both sides.S-CSCF sends to first application server and the 3rd application server according to existing standard to describe with release message BYE, and then first application server and the 3rd application server are carried out business according to the service logic continuation of oneself, can not be released.Obviously, this can't satisfy the requirement that IMS-GWF discharges all dialogues of current business control.
Summary of the invention
The object of the present invention is to provide a kind of call session control device and method, can discharge the requirement of all dialogues of current business control.
This device comprises: module is set up in session, according to the initial filter criteria in the user contracting data session request is triggered to one or more application servers, and stores all through call conversation control function entity and the dialog information relevant with conversation request; And the session release module, be used for when discharging session, according to the dialog information release dialogue relevant of storage with conversation request.
The session release module comprises: first discharges the request structural unit, is used to the server end structure first of each dialogue to discharge request, and discharges request is sent to dialogue along the path of session establishment server end with first; And second discharge the request structural unit, is used to the client structure second of each dialogue to discharge request, and discharges request is sent to dialogue along the path of session establishment client with second.
Dialog information is for discharging the necessary information of dialogue, and dialog information comprises: the Call-ID header field in the session request, From header field, To header field, Contact header field, Cseq header field and Record-Route header field.
This method comprises: step 702 is triggered to one or more application servers according to the initial filter criteria in the user contracting data with the session request, and stores all through call conversation control function entity and the dialog information relevant with conversation request; And step 704, when discharging session, according to all dialog information relevant release dialogues of storage with conversation request.
Dialog information is for discharging the necessary information of dialogue, and dialog information comprises: the Call-ID header field in the session request, From header field, To header field, Contact header field, Cseq header field and Record-Route header field.
Step 704 comprises: when call conversation control function entity itself or external entity indication release session, discharge all dialogues according to all dialog information relevant with conversation request of storing.
Discharging all dialogues according to all dialog information relevant with conversation request of storing comprises: the server end structure first that is each dialogue discharges request, and discharges the server end of asking to be sent to along the path of session establishment dialogue with described first; And be the client structure second release request of each dialogue, and discharge request is sent to dialogue along the path of session establishment client with described second.
Step 704 comprises: when application server discharges session, handle indication according to the dialog information relevant with conversation request and the release of storage, discharge all dialogues or subdialogue.
Wherein, discharging the processing indication is: the default process indication in user contracting data in the initial filter criteria of application server correspondence; Indication is handled in the release of adding in the initial filter criteria of user contracting data; Indication is handled in the release of perhaps disposing in call conversation control function entity.
Discharge to handle to indicate and comprise: session continues indication and session stops indication.Do not exist if discharge to handle to indicate, then continue indication and handle according to session.
When being designated as session continuation indication, transmit the request of release along the path of session establishment, the release dialogue; And when being designated as session termination indication, transmit the request of release along the path of session establishment, the while discharges all dialogues of release request place one side of application server according to all dialog information relevant with conversation request of storage.
The process of all dialogues of release request place one side of release application server comprises: the server end structure first that is dialogue discharges request, and the first release request is sent to the server end of dialogue along the path of session establishment; And for the client structure second of dialogue discharges request, and discharge the client that request is sent to dialogue with second along the path of session establishment.
Call session control device that the application of the invention provides and method, can be after receiving the release solicited message of application server, according to the dialog information of storage with discharge to handle indication and judge whether that needs discharge all that be triggered and dialogues application server, and when needed, discharge all that be triggered and dialogues application server.
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 illustrates the block diagram according to IM CN subsystem of the present invention;
Fig. 2 illustrates the Organization Chart that IM CN subsystem Network according to the present invention provides;
Fig. 3 illustrates the schematic diagram of carrying out termination user agent or Redirect Server role according to application server of the present invention;
Fig. 4 illustrates the schematic diagram of carrying out the Session initiation Protocol proxy role according to application server of the present invention;
Fig. 5 illustrates application server according to the present invention is carried out third party call control as the route back-to-back user agent schematic diagram;
Fig. 6 illustrates the block diagram according to call session control device of the present invention;
Fig. 7 illustrates the flow chart according to call session control method of the present invention;
S-CSCF discharged schematic diagrames of the process of all professional control sessions when Fig. 8 illustrated network logging off users according to an embodiment of the invention; And
S-CSCF discharged schematic diagrames of the process of all professional control sessions when Fig. 9 illustrated application server initiation session release according to an embodiment of the invention.
Embodiment
Describe the present invention below with reference to the accompanying drawings in detail.
Fig. 6 illustrates the block diagram according to call session control device of the present invention.As shown in Figure 6, this device 600 comprises: module 602 is set up in session, according to the initial filter criteria in the user contracting data session request is triggered to one or more application servers, and stores all through call conversation control function entity and the dialog information relevant with conversation request; And session release module 604, be used for when discharging session, according to the dialog information release dialogue relevant of storage with conversation request.
Session release module 604 comprises: first discharges request structural unit 604-2, is used to server end (UAS) structure first of each dialogue to discharge request, and discharges request is sent to dialogue along the path of session establishment server end with first; And second discharge request structural unit 604-4, and second discharges the request structural unit, is used to client (UAC) structure second of each dialogue to discharge request, and discharges request is sent to dialogue along the path of session establishment client with second.
Dialog information is for discharging the necessary information of dialogue, and dialog information comprises: the Call-ID header field in the session request, From header field, To header field, Contact header field, Cseq header field and Record-Route header field.
Fig. 7 illustrates the flow chart according to call session control method of the present invention.As shown in Figure 7, the call session control method may further comprise the steps: step 702, according to the initial filter criteria in the user contracting data session request is triggered to one or more application servers, and stores all through call conversation control function entity and the dialog information relevant with conversation request; And step 704, when discharging session, according to all dialog information relevant release dialogues of storage with conversation request.
Wherein, dialog information is for discharging the necessary information of dialogue, and dialog information comprises: the Call-ID header field in the session request, From header field, To header field, Contact header field, Cseq header field and Record-Route header field.
Step 704 comprises: when call conversation control function entity itself or external entity indication release session, discharge all dialogues according to all dialog information relevant with conversation request of storing.
Discharging all dialogues according to all dialog information relevant with conversation request of storing comprises: server end (UAS) structure first that is each dialogue discharges request, and discharges the server end of asking to be sent to along the path of session establishment dialogue with described first; And be client (UAC) the structure second release request of each dialogue, and discharge request is sent to dialogue along the path of session establishment client with described second.
Step 704 comprises: when application server discharges session, handle indication according to the dialog information relevant with conversation request and the release of storage, discharge all dialogues or subdialogue.
Wherein, discharging the processing indication is: the default process indication in user contracting data in the initial filter criteria of application server correspondence; Indication is handled in the release of adding in the initial filter criteria of user contracting data; Indication is handled in the release of perhaps disposing in call conversation control function entity.
Discharge to handle to indicate and comprise: session continues indication and session stops indication.
When being designated as session continuation indication, transmit the request of release along the path of session establishment, the release dialogue; And when being designated as session termination indication, transmit the request of release along the path of session establishment, the while discharges all dialogues of release request place one side of application server according to all dialog information relevant with conversation request of storage.
The process of all dialogues of release request place one side of release application server comprises: server end (UAS) structure first that is dialogue discharges request, and the first release request is sent to the server end of dialogue along the path of session establishment; And for client (UAC) structure second of dialogue discharges request, and discharge the client that request is sent to dialogue with second along the path of session establishment.
S-CSCF carries out the session triggering of Network control and the process that discharges is:
A. the professional session trigger process of controlling:
When S-CSCF receives conversation request message, check that the original dialogue that S-CSCF was placed in the Route header field in the past identifies the highest item that whether is present in Route header field in the request message.
1, if there is no, it represents that this request is to visit this S-CSCF for the first time.If this request is the INVITE request, at this moment S-CSCF preserves the Call-ID header field that receives, the tag parameter of From header field, tag parameter, Contact header field, Cseq header field and the Record-Route header field value of To header field from request, can discharge this dialogue with S-CSCF when needed.
If 2 exist, it has represented and the getting in touch of an existing dialogue that this request is the response for previous transmission request of sending from application server.If this request is the INVITE request, at this moment S-CSCF judges whether this request message and the request of oneself mailing to this application server are that same dialogue is (with the Call-ID header field in the request message that receives, the tag of From header field, the tag of To header field and mail to Call-ID header field in the request message that is associated of this application server, the tag of From header field, the tag of To header field compares), if find it is not same dialogue, then S-CSCF preserves the Call-ID header field that receives from request, the tag of From header field, the tag of To header field, Contact header field, Cseq header field and Record-Route header field value can discharge this dialogue with S-CSCF when needed.
The existing session processing mode of as described above is handled then.
The business control session dispose procedure that B.S-CSCF initiates:
When inner or outside indication session discharges as S-CSCF (for example registration timer is overtime, management logging off users etc.), S-CSCF sends the relevant dialogue that the CANCEL cancellation is being set up according to RFC3261 to each affairs of this business control, perhaps sends BYE to each dialogue both sides of this business control and discharges the dialogue of having set up.
The method that S-CSCF sends BYE is as follows:
1, each dialog information of preserving according to S-CSCF is constructed first BYE request for the callee side of each dialogue, sends the subscriber proxy server end (UserAgent Server is called for short UAS) of this dialogue then.
2, each dialog information of preserving according to S-CSCF is second BYE request of Calling Side structure of each dialogue, sends the User Agent Client (User AgentClient is called for short UAC) of this dialogue then.
C. the business of application server initiation is controlled the session dispose procedure:
After certain application server in the professional control flow discharged dialogue, S-CSCF need judge whether only to discharge current dialogue, still discharges all dialogues in this business control flow.Method is as follows:
Method one:
When S-CSCF receives session that application server initiates when discharging request from ISC interface, S-CSCF checks the default process indication of the initial filter criteria of this application server correspondence:
If the value of the default process in 1 filtering rule is " SESSION_CONTINUED ", perhaps there is not the default process indication, S-CSCF directly transmits release message according to the path of this session establishment.
If the value of the default process in 2 filtering rules is " SESSION_TERMINATED ", then S-CSCF directly transmits release message according to the path of this session establishment, and discharges all professional control dialogues of a side at this application server release message place according to the method that B describes.
Method two:
Increase by one in the initial filter criteria in user's subscription data and discharge the processing indication, perhaps dispose to discharge to handle in call conversation control function entity and indicate, its value is:
SESSION_CONTINUED: show that the dialogue of the application server controls that is triggered in other initial filter criteria is if not same dialogue if the application server in the initial filter criteria discharges dialogue, S-CSCF does not discharge these dialogues.
SESSION_TERMINATED: show that S-CSCF must discharge the dialogue of the application server controls that is triggered in other initial filter criteria simultaneously if the application server in the initial filter criteria discharges dialogue.
When S-CSCF receives dialogue that this application server initiates when discharging request from ISC interface, S-CSCF checks that the release of the initial filter criteria that triggers this application server correspondence handles indication:
If it is " SESSION_CONTINUED " that the value of indication is handled in the release in 1 filtering rule, perhaps there is not the default process indication, S-CSCF directly transmits release message according to the path of this session establishment.
If it is " SESSION_TERMINATED " that the value of indication is handled in the release in 2 filtering rules, then S-CSCF directly transmits release message according to the path of this session establishment, and discharges all professional control dialogues of a side at this application server release message place according to the method that B describes.
Do not handle indication if discharge, then handle according to SESSION_CONTINUED.
S-CSCF 304 discharged schematic diagrames of the process of all professional control dialogues when Fig. 8 illustrated network logging off users according to an embodiment of the invention.As shown in Figure 8, S-CSCF discharges all professional control dialogues and may further comprise the steps during the network logging off users:
Step 1, S-CSCF 304 receive conversation request from Mw, and the dialogue identifier in the request message is Call-ID1, From tag1 and To tag1.
Dialogue identifier Call-ID1, From tag1 in step 2, the S-CSCF 304 preservation message and the dialog information of To tag1, take out user's subscription data then, the processing initial filter criteria checks, mate certain bar rule after, forward the request to corresponding application server 1.
Step 3, application server 1 are back-to-back user agent, and after the logic of managing business, the dialogue identifier in the request message of beaming back is Call-ID2, From tag2 and To tag2.
Dialogue identifier in dialogue identifier in the transmission message that step 4, S-CSCF 304 relatively preserve and the reception message, find the two difference, the dialogue identifier of then preserving in the message is the dialog information of Call-ID2, From tag2 and To tag2, S-CSCF continues the initial filter criteria inspection of low priority then, after mating certain bar rule, forward the request to corresponding application server 2.
Step 5, application server 2 are Proxy, and after the logic of managing business, the dialogue identifier in the request message of beaming back is Call-ID2, From tag2 and To tag2.
Dialogue identifier in dialogue identifier in the transmission message that step 6, S-CSCF 304 relatively preserve and the reception message, find that the two is identical, then S-CSCF continues the initial filter criteria inspection of low priority, mate certain bar rule after, forward the request to corresponding application server 3.
Step 7, application server 3 are back-to-back user agent, and after the logic of managing business, the dialogue identifier in the request message of beaming back is Call-ID3, From tag3 and To tag3.
Dialogue identifier in dialogue identifier in the transmission message that step 8, S-CSCF 304 relatively preserve and the reception message, find the two difference, the dialogue identifier of then preserving in the message is the dialog information of Call-ID3, From tag3 and to tag3, S-CSCF continues the initial filter criteria inspection of low priority then, do not find the rule of coupling, transmit and ask away Mw.
After session was set up, network logging off users, S-CSCF discharged this user's session.
Step 9, S-CSCF 304 at first discharge dialogue 3, send BYE message to Mw and discharge callee side.
Step 10, S-CSCF 304 send BYE message to application server 3 and discharge callee side, discharge dialogue 3 opposite sides.
Step 11, S-CSCF 304 discharge dialogue 2, send BYE message to application server 3 interfaces and discharge dialogue 2 one sides.
Step 12, S-CSCF 304 send BYE message to application server 2 and discharge callee side, discharge dialogue 2 opposite sides.
Step 13, application server 2304 are transmitted the BYE release message along the path of dialogue 2.
Step 14, S-CSCF 304 transmit the BYE release message to application server 1 along the path of dialogue 2.
Step 15, S-CSCF 304 send BYE message to application server 1 and discharge callee side, discharge dialogue 1 one sides.
Step 16, S-CSCF 304 send BYE message to Mw and discharge Calling Side.
S-CSCF discharged schematic diagrames of the process of all professional control dialogues when Fig. 9 illustrated application server initiation session release according to an embodiment of the invention.S-CSCF discharged all professional control dialogues and may further comprise the steps when as shown in Figure 9, the application server initiation session discharged:
Step 1, S-CSCF 304 receive conversation request from Mw, and the dialogue identifier in the request message is Call-ID1, From tag1 and To tag1.
Dialogue identifier Call-ID1, From tag1 in step 2, the S-CSCF 304 preservation message and the dialog information of To tag1, take out user's subscription data then, the processing initial filter criteria checks, mate certain bar rule after, forward the request to corresponding application server 1.
Step 3, application server 1 are back-to-back user agent, and after the logic of managing business, the dialogue identifier in the request message of beaming back is Call-ID2, From tag2 and To tag2.
Dialogue identifier in dialogue identifier in the transmission message that step 4, S-CSCF 304 relatively preserve and the reception message, find the two difference, the dialogue identifier of then preserving in the message is the dialog information of Call-ID2, From tag2 and To tag2, S-CSCF continues the initial filter criteria inspection of low priority then, after mating certain bar rule, forward the request to corresponding application server 2.
Step 5, application server 1 are Proxy, and after the logic of managing business, the dialogue identifier in the request message of beaming back is Call-ID2, From tag2 and To tag2.
Dialogue identifier in dialogue identifier in the transmission message that step 6, S-CSCF 304 relatively preserve and the reception message, find that the two is identical, then S-CSCF continues the initial filter criteria inspection of low priority, mate certain bar rule after, forward the request to corresponding application server 3.
Step 7, application server 3 are back-to-back user agent, and after the logic of managing business, the dialogue identifier in the request message of beaming back is Call-ID3, From tag3 and To tag3.
Dialogue identifier in dialogue identifier in the transmission message that step 8, S-CSCF 304 relatively preserve and the reception message, find the two difference, the dialogue identifier of then preserving in the message is the dialog information of Call-ID3, From tag3 and To tag3, S-CSCF continues the initial filter criteria inspection of low priority then, do not find the rule of coupling, transmit and ask away Mw.
After session was set up, application server 3 initiation session discharged request.
Step 9, application server 3 at first discharge dialogue 2, send BYE message by ISC interface to S-CSCF.
After step 10, S-CSCF 304 receive the release message of dialogue 2, check that the release processing in the application server 3 corresponding initial filter criteria is designated as SESSION_TERMINATED, discharge the dialogue 1 of dialogue 2 one sides simultaneously.
Step 11, S-CSCF 304 transmit the release message BYE of dialogue 2 to application server 2.
Step 12, S-CSCF 304 receive the BYE release message of the dialogue 2 of application server 2 forwardings.
Step 13, S-CSCF 304 transmit the release message BYE of dialogue 2 to application server 1.
Step 14, S-CSCF 304 send BYE message to application server 1 interface and discharge dialogue 1.
Step 15, S-CSCF 304 send BYE message to Mw and discharge Calling Side dialogue 1.
Step 16, application server 3 discharge dialogue 3, send BYE message by ISC interface to S-CSCF.
Step 17, S-CSCF 304 send BYE message to callee side and discharge dialogue 3.
S-CSCF preserves all dialog information through S-CSCF, and when network initiated to discharge all dialogues of user's current business control, S-CSCF can discharge the dialogue of all application servers that are triggered according to the dialog information of preserving.
S-CSCF preserves all dialog information through S-CSCF, when application server initiates to discharge the dialogue of customer service control, S-CSCF can be according to the dialog information of preserving, and the release that triggers in the initial filter criteria of this application server handles indication, judges whether to discharge all dialogues of current business control.
After the present invention has realized that S-CSCF is triggered to application server according to initial filter criteria, when network initiates to discharge all dialogues of current business control, when perhaps application server initiates to discharge the dialogue of customer service control, S-CSCF can discharge all dialogues of current business control according to the dialog information of preserving.
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 (12)

1. a call session control device is characterized in that, described device comprises:
Module is set up in session, according to the initial filter criteria in the user contracting data session request is triggered to one or more application servers, and stores all through call conversation control function entity and the dialog information relevant with described conversation request; And
The session release module is used for when discharging session, according to all dialog information relevant with described conversation request release dialogues of storage.
2. call session control device according to claim 1 is characterized in that, described session release module comprises:
First discharges the request structural unit, is used to the server end structure first of each dialogue to discharge request, and discharges request is sent to described dialogue along the path of described session establishment server end with described first; And
Second discharges the request structural unit, is used to the client structure second of each dialogue to discharge request, and discharges request is sent to described dialogue along the path of described session establishment client with described second.
3. call session control device according to claim 1 and 2, it is characterized in that, described dialog information is for discharging the necessary information of dialogue, and described dialog information comprises: the Call-ID header field in the session request, From header field, To header field, Contact header field, Cseq header field and Record-Route header field.
4. a call session control method is characterized in that, described method comprises:
Step 702 is triggered to one or more application servers according to the initial filter criteria in the user contracting data with the session request, and stores all through call conversation control function entity and the dialog information relevant with described conversation request; And
Step 704 is when discharging session, according to the dialog information release dialogue relevant with described conversation request of storage.
5. call session control method according to claim 4, it is characterized in that, described dialog information is for discharging the necessary information of dialogue, and described dialog information comprises: the Call-ID header field in the session request, From header field, To header field, Contact header field, Cseq header field and Record-Route header field.
6. call session control method according to claim 4 is characterized in that, described step 704 comprises:
When call conversation control function entity itself or external entity indication release session, discharge all dialogues according to all dialog information relevant of storing with described conversation request.
7. call session control method according to claim 6 is characterized in that, discharges all dialogues according to all dialog information relevant with described conversation request of storing and comprises:
Be the server end structure first release request of each dialogue, and discharge request is sent to described dialogue along the path of described session establishment server end described first; And
Be the client structure second release request of each dialogue, and discharge request is sent to described dialogue along the path of described session establishment client described second.
8. call session control method according to claim 4 is characterized in that, described step 704 comprises:
When described application server discharges session, handle indication according to the dialog information relevant and the release of storage with described conversation request, discharge all dialogues or subdialogue.
9. call session control method according to claim 8, it is characterized in that described release is handled indication and is: the default process indication in user contracting data in the initial filter criteria of application server correspondence, the release of adding in the initial filter criteria of user contracting data are handled the release of indicating or disposing and are handled indication in call conversation control function entity.
10. call session control method according to claim 9 is characterized in that, described release is handled indication and comprised: session continues indication and session stops indication.
11. each described call session control method in 10 according to Claim 8 is characterized in that:
When being designated as session and continuing indication or indication and do not exist, transmit the request of release along the path of session establishment, discharge described dialogue; And
When being designated as session termination indication, transmit the request of release along the path of session establishment, the while discharges all dialogues of release request place one side of described application server according to all dialog information relevant with described conversation request of storage.
12. call session control method according to claim 11 is characterized in that, the process of all dialogues that discharges release request place one side of described application server comprises:
Be the server end structure first release request of described dialogue, and discharge the server end that request is sent to described dialogue with described first along the path of described session establishment; And
Be the client structure second release request of described dialogue, and discharge the client that request is sent to described dialogue with described second along the path of described session establishment.
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