CN101155173A

CN101155173A - Method and system for circuit field sensing IMS field multimedia conversation media information

Info

Publication number: CN101155173A
Application number: CN 200610152690
Authority: CN
Inventors: 李岩; 朱东铭
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-09-25
Filing date: 2006-09-25
Publication date: 2008-04-02
Anticipated expiration: 2026-09-25
Also published as: WO2008040171A1; CN101155173B

Abstract

The present invention discloses a method as well as a system for apperceiving IMS field multimedia conversation medium information of circuit field, for solving the problem that the existing circuit field intelligent business control entity can not apperceive IMS field multimedia conversation medium information. The method includes: a business exchanging function entity (IM-SSF) obtains multimedia conversation medium information from the received IMS field conversation control signalling; and IM-SSF report the obtained multimedia conversation medium information to the intelligent business control entity (SCP). The system of the present invention comprises: HSS, SCP and S-CSCF, IM-SSF which connects with the HSS, SCP and S-CSCF separately; interfaces between the IM-SSF and the SCP. The present invention ensures the circuit field intelligent business control entity apperceive IMS field multimedia conversation medium information.

Description

The method and system of circuit field sensing IMS field multimedia conversation media information

Technical field

The present invention relates to the communications field, particularly relate to a kind of method and system of circuit field sensing IMS field multimedia conversation media information.

Background technology

The carrying of next generation communication network has begun to use instead IP comprehensively.From the development of communication network,, all experienced from the legacy circuit-switched networks network to control and carried the IP packet network of separation again to the such evolution process of the multi-media network of all-IP no matter be CDMA or GSM/WCDMA.The example that is evolved to CDMA: the cdma network carrying to having defined two evolution stages of LMSD and MMD, select IP to select as the carrying of core net and Access Network, and the A interface is selected IP from initial TDM carrying on bearer types; CDMA LMSD stage circuit domain has realized separating of carrying and control, supports IP on bearer types; The MMD version is then introduced IMS territory, interface signaling IPization (SIP) in core net.Final goal in this evolution process is to provide professional by unified IMS network.

On the other hand, U.S. Bel communication common carrier in 1984 and American Technology Corporation (AMTECH) have proposed the notion of intelligent network, it be one can be fast, convenient, flexibly, economical, generate and realize the system of various new business to have the design feature that Business Processing and call treatment are separated effectively.Because intelligent network has above advantage, traditional circuit domain has been introduced the intelligent network framework rapidly, wherein fixed network has defined Intelligent Network Application Protocol (INAP, Intelligent Network Application Protocol), GSM/WCDMA is for realizing IN service, introduce mobile network and strengthened logical client application (CAMEL, Customised Application forMobile network Enhanced Logic), CDMA mobile communication system has defined a series of wireless intelligent networks (WIN, Wireless Intelligent Network) agreement.More than these intelligent network frameworks all be based on traditional circuit domain, after traditional circuit domain carries out the transition to the IMS network, still be necessary intelligent network is incorporated into the IMS territory, GSM/WCDMA is incorporated into the IMS territory to the CAMEL function structure, and defined relevant criterion (TS23.278), and also having relevant criterion to define at present, CDMA how the intelligent network based on WIN is not incorporated into the IMS territory.

One, the IN service realization flow of existing CDMA traditional circuit domain.

The CDMA traditional circuit domain provides a variety of IN services to the user, as PPC (pre-payment), and FPH (by being added payings), business such as ICS (going into to exhale screening) below is an example with the PPC business, and the realization mechanism of CDMA traditional circuit area intelligent service is described.

● the flow process that the signatory PPC service concurrence of traditional circuit domain user plays caller comprises the following steps: referring to shown in Figure 1

1. the user sends to MSC/SSF by BSC and begins to call for to ask, and carries called number and calling subscriber identification.

The Origination_Attempt_Authorized trigger 2.MSC/SSF the judgement calling subscriber has contracted according to the SCP address of this recording trigger, sends ORREQ message to SCP, carries calling subscriber identification.

3.SCP check that the user has activated PPC business and user and had enough account balances and then return orreq to MSC/SSF, indicating call continues.

The Calling_Routing_Address_Available trigger 4.MSC/SSF the judgement calling subscriber has contracted sends ANLYZD according to this trigger corresponding address to SCP, carries the called routing iinformation that obtains according to called number.

5.SCP according to the called routing iinformation in the ANLYZD, the rate of decision calling subscriber conversation is returned anlyzd to MSC/SSF, indicating call continues.

6.MSC/SSF, send initial call message (by interoffice control signaling) to called subscriber's home network according to routing iinformation.

7. called network returns called terminal ringing message, sends ring-back tone to the calling subscriber.

8. called network returns user answer.

The O_Answer trigger 9.MSC/SSF the judgement calling subscriber has contracted sends OANSWER message according to this trigger corresponding address to SCP, carries answering time of called subscriber, and SCP began to charge according to this time.

● the signatory PPC business of traditional circuit domain user, comprises the following steps: referring to shown in Figure 2 as called flow process

Begin to call for to ask 1.MSC/SSF receive.

2.MSC/SSF judging the called subscriber is the mobile subscriber, obtains called routing iinformation to the HLR of called ownership.

The PPC business 3.HLR the judgement user has contracted is then returned corresponding intelligent contactor tabulation and CSI called subscriber identification.

4.MSC/SSF the information of returning according to HLR is judged user's Initial_Termination trigger of having contracted, and according to the SCP address of this recording trigger, sends ANLYZD message to SCP, carries CSI called subscriber identification.

5.SCP check that the called subscriber has activated PPC business and user and had enough account balances and then return anlyzd to MSC/SSF, indicating call continues.

6.MSC/SSF obtain called routing iinformation to HLR once more, carry the trigtype parameter, get route for the first time to distinguish.

7.HLR return termlist, in the current MSC/SSF of the being in compass of competency of indication called subscriber (if the user roams into other MSC, then HLR can return the routing iinformation that can be routed to other MSC).

The Called_Routing_Address_Available trigger 8.MSC/SSF the judgement called subscriber has contracted sends ANLYZD according to this trigger corresponding address to SCP, carries the called routing iinformation that obtains according to the HLR return messages.

9.SCP according to the called routing iinformation in the ANLYZD, the rate of decision called subscriber conversation is returned anlyzd to MSC/SSF, indicating call continues.

10～11. because the called subscriber just at this MSC/SSF, MSC/SSF sends paging request message to subordinate BSC, BSC returns page response (if the called subscriber roams into other MSC, the routing iinformation that returns according to HLR of MSC/SSF then, MSC to correspondence sends initial call message, and called number is a routing number).

12～13.MSC/SSF sends assignment message to subordinate BSC, distributes and calls out resource requirement, and BSC returns assignment and finishes, and this moment, the called subscriber began ring.

14.MSC/SSF return called terminal ringing to Calling Side.

15. called subscriber's echo reply message.

The T_Answer trigger 16.MSC/SSF the judgement called subscriber has contracted sends TANSWER message according to this trigger corresponding address to SCP, carries answering time of called subscriber, and SCP began to charge according to this time.

17.MSC/SSF return called party answer to Calling Side.

From above CDMA traditional circuit area intelligent service flow process as can be seen, for intelligent network business, the major function of MSC/SSF (can come from Access Network after receiving call control signalling exactly, also can be and come from other MSC), according to the information that this call control signalling comprises, judge whether to satisfy the intelligent contactor condition that the user contracts, if satisfy, then mutual with SCP, provide calling relevant information to SCP, SCP finishes relevant IN service according to this information.What need explanation a bit is, the MSC/SSF of CDMA traditional circuit domain is a kind of business of conduct voice calls only, thus with all intelligent interactions of SCP in, do not carry type of service (acquiescence is exactly voice).

Two, the Multimedia session in IMS territory.

IMS territory user can carry out Multimedia session (promptly comprising voice, the session of multiple Media Stream such as video), and these media stream bearing are on IP.When calling and called are set up conversation, because the difference of calling and called terminal capability difference or calling and called network condition needs the calling and called user that Multimedia session is held consultation, to set up the session that both sides approve.

● the common call setup flow process in IMS territory comprises the following steps: referring to shown in Figure 3

1.UE1 sending the beginning by P_CSCF to the S_CSCF of calling subscriber registration calls for and asks (for the purpose of omitting among the figure, P_CSCF does not draw), comprise the voice that calling will be set up in the request message, medium stream informations such as video (medium stream information comprises the encoding scheme of every kind of Media Stream that Calling Side is supported and is the information such as bandwidth of every kind of allocated for media streams).

2.S_CSCF according to the called party information in the initial call message (request url carries), find called home network, to the I_CSCF of called ownership forwarded call request (other business if the calling subscriber has contracted, the S_CSCF iFC that can contract according to the user then, beginning called for to ask be forwarded to AS, after AS handles, return to S_CSCF again, proceed route) by S_CSCF.

3. the I_CSCF of called home network learns the S_CSCF that the called subscriber registers by mutual with the HSS of called subscriber's ownership, call request is forwarded to the S_CSCF (for the purpose of omitting among the figure, the mutual process of I_CSCF and HSS of not drawing) of called subscriber's registration.

4. the station address of record when the S_CSCF of called subscriber registration is according to registration sends the beginning by P_CSCF to the called subscriber and calls for and ask (for the purpose of omitting among the figure, P_CSCF does not draw).Annotate: the iFC of the pact that also can contract according to the called subscriber with the same S_CSCF of caller, the beginning called for to ask be forwarded to AS, after AS handles, return to S_CSCF again, continue to send the beginning by S_CSCF and call for and ask to the called subscriber.

5. the called subscriber returns 183 message, the called subscriber is current only can receive the voice medium composition in indication, and voice medium becomes the encoding scheme (can have multiple) that branch supports and be the bandwidth of voice medium flow distribution, and this message calls for according to the beginning that the path Yuan Lu of foundation returns the calling subscriber when asking.

6. the calling subscriber returns the affirmation message (PRACK) of 183 responses, carry the final speech coding scheme of selecting (only a kind of) of calling subscriber, according to receiving the routed path that writes down in 183 response messages, send to called subscriber's (I_CSCF only is used for the route of initial request, and subsequent request is not via I_CSCF).

7. the called subscriber returns the response message of PRACK, the media information that carries and consistent (negotiation of media streams is finished) that receive.

8. after the calling subscriber finishes the Calling Side resource reservation, send UPDATE message to callee side, indication Calling Side resource reservation is finished.

9. the called subscriber returns the response message of UPDATE.

10. after the called subscriber finishes resource reservation, return 180 ALERTING messages.

11. the calling subscriber returns the affirmation message (PRACK) of 180 responses.

12. the called subscriber returns the response message of PRACK.

13. the called subscriber returns the 200OK response message.

14. the affirmation message (ACK) of calling subscriber's echo reply message.

After conversation was set up, the calling and called user still can initiate media consultation process again according to user's needs, can increase, reduces or revise the Media Stream of current talking.Media re-negotiation process in the session of IMS territory comprises the following steps: referring to shown in Figure 4

1.UE1 send session change request, requirement becomes the multimedia conversation from voice call, comprise the voice that will rebulid in the request message, medium stream informations such as video (medium stream information comprises the encoding scheme of every kind of Media Stream that UE1 supports and is the information such as bandwidth of every kind of allocated for media streams), because session change request is the message that sends in current sessions, the routing iinformation that inserts when setting up according to session directly sends to UE2 (during omitting among the figure, P_CSCF does not draw).Annotate: the UE1 here promptly can be the calling subscriber and also can be the called subscriber.

2.UE2 return 183 message, the indication UE2 current multimedia call that receives comprises the encoding scheme (can have multiple) that every kind of Media Stream supports and is the bandwidth of every kind of allocated for media streams in the message, this message returns to UE1.

3.UE1 the affirmation message (PRACK) of 183 responses is returned at the family, carries the encoding scheme (only a kind of) of the final every kind of Media Stream selecting of UE1, sends to UE2.

4.UE2 return the response message of PRACK, the media information that carries and consistent (negotiation of media streams is finished) that receive.

5.UE1 after finishing the Calling Side resource reservation, send UPDATE message to callee side, indication UE1 resource reservation is finished.

6.UE2 return the response message of UPDATE.

7.UE2 after finishing resource reservation, return 180 ALERTING messages.

8.UE1 return the affirmation message (PRACK) of 180 responses.

9.UE2 return the response message of PRACK.

Finish message 10.UE2 return 200OK session change request.

11.UE1 the affirmation message (ACK) of echo reply message.

From above two IMS territory flow processs as can be seen, the IMS field multimedia is called out and is compared with the audio call of traditional circuit domain, media consultation process when many sessions are set up and the media consultation process in the session, and the audio call of traditional circuit domain this medium of support voice only, and its coded format also is (the narrowband speech code/decode format) fixed, so do not need this media consultation process.

Three,, defined a kind of framework that the traditional circuit area intelligent service is provided to IMS territory user 23.278 li of 3GPP standards referring to shown in Figure 5.

This standard has been introduced the functional entity of IM-SSF in the IMS territory, IM-SSF is as an AS on the one hand, receive the sip message that S-CSCF sends by ISC interface, relevant signaling is called out in perception, IM-SSF is as a SSF on the other hand, and it detects the user needs to be triggered to SCP and go to carry out business control behind the bid of IMS territory.IM-SSF downloads intelligent subscription data by the Si interface, and according to this subscription data or network configuration cases, calling is triggered to corresponding SCP, carries out IN service and handles.Have the MAP interface in the GSM network between the functional entity of gsmSCP and the HSS/HLR, can obtain the positional information (roaming information) of user in circuit domain by this interface, signatory situation of IN service and calling locking, preceding commentaries on classics waits other circuit domain supplementary service information.Between 23.278 li IM-SSF of 3GPP standard and gsmSCP, CAMEL Application Part (being used for the GSM network) can be used alternately, similarly the ANSI41 agreement can be used alternately between IM-SSF and the CDMA intelligent business control entity (winSCP), referring to shown in Figure 6.

Mentioned IM-SSF in the prior art and had the ability that is triggered to CDMA intelligent business control entity (winSCP), but its interface protocol (the T1 interface among Fig. 6) still uses the ANSI41 agreement of traditional circuit domain.The T1 interface protocol of traditional circuit domain is only held audio call, uses this interface protocol, and winSCP is the process of the media negotiation of Multimedia session that can not the sensing IMS field user, so winSCP can not obtain user's multimedia messages.With the PPC business is example, and winSCP, can only charge to the user with identical standard so these two kinds of callings can't be distinguished to Client-initiated because can not know Client-initiated is multimedia call or audio call only.If the user increases or reduced medium stream information in communication process in addition, winSCP also can't perception, charges for the standard of this conversation can only be with initial call the time.Above defective makes that the IN service of traditional circuit domain can't be perfect offers IMS territory user.

Summary of the invention

The invention provides a kind of method and system of circuit field sensing IMS field multimedia conversation media information, in order to solve the problem that circuit domain intelligent business control entity in the prior art can't sensing IMS field multimedia conversation media information.

Further, the circuit domain intelligent business control entity can't be according to the multimedia conversation media information adjustment rate in IMS territory or selection called subscriber's problem in the solution prior art.

The inventive method comprises the following steps:

Service Switching Function entity IM-SSF obtains multimedia conversation media information from the IMS territory session control signaling of receiving; And IM-SSF reports intelligent business control entity SCP with the multimedia conversation media information that obtains.

Wherein, described multimedia conversation media information comprises: the media negotiation information the when session of IMS territory is set up, and the media negotiation information in the session of IMS territory.

Further, described media negotiation information comprises one of following at least: medium type, the required bandwidth of medium, media transmission protocol and medium code/decode format.

In sum, described SCP adjusts rate according to the current multimedia conversation media information of receiving, and IMS territory user is chargeed.

Further again, set up in the process in the calling and called session, comprise the following steps:

A1, finish media negotiation after, S-CSCF informs IM-SSF with the media negotiation object information;

The SCP address that writes down in the trigger that B1, IM-SSF contract according to the user is carrying described media negotiation object information in the message that sends to this SCP.

Further, also comprise step before the described steps A 1:

C11, S-CSCF be according to initial filter criteria iFC, calls for to ask in the beginning of transmitting to IM-SSF and carry initial multimedia conversation media information in the message;

The SCP address that writes down in the trigger that D11, IM-SSF contract according to the user carries described initial multimedia conversation media information, so that this SCP determines initial rate in the message that sends to this SCP.

Further, Calling Side or callee side initiated to increase the process of Media Stream before described steps A 1.

Further again, before the described steps A 1, if after described SCP is known initial multimedia conversation media information, increase medium type again, then comprise the SCP address that writes down in the trigger that step: E11, IM-SSF contract according to the user, in the message that sends to this SCP, carry the medium type of described increase and the direction of medium change at least.

Further again, if IMS territory user provides multimedia conversation media information as the called subscriber, also comprise step: C12, S-CSCF according to initial filter criteria iFC before the then described steps A 1, call for to ask in the beginning of transmitting and do not carry multimedia conversation media information in the message to IM-SSF; The SCP address that writes down in the trigger that D12, IM-SSF contract according to the user is not carrying multimedia conversation media information in the message that sends to this SCP; After E12, callee side selected multimedia conversation media information, the SCP address that writes down in the trigger that IM-SSF contracts according to the user was carrying the multimedia conversation media information that callee side is selected in the message that sends to this SCP, and the direction of medium change.Before the described steps A 1, if increase medium type, also comprise the SCP address that writes down in the trigger that step: F12, IM-SSF contract according to the user after the then described step e 12, in the message that sends to this SCP, carry the medium type of increase and the direction of medium change at least.

Further again, if in the conversation procedure media re-negotiation takes place, after then comprising the following steps: A2, finishing media re-negotiation, S-CSCF informs IM-SSF with the media re-negotiation object information; The SCP address that writes down in the trigger that B2, IM-SSF contract according to the user is carrying described media re-negotiation object information in the message that sends to this SCP.

Further, also comprise step: S-CSCF according to initial filter criteria iFC before the described steps A 2, in the session change request message of transmitting to IM-SSF, carry the multimedia conversation media information of desire change; The SCP address that writes down in the trigger that IM-SSF contracts according to the user is carrying the multimedia conversation media information of desire change in the message that sends to this SCP, and the direction of session change.

In sum, if SCP initiation session status poll, after comprising the following steps: that then IM-SSF receives query messages, the session status corresponding with it according to the session information inspection of carrying in the query messages, if this session is not released, then IM-SSF carries the employed multimedia conversation media information of current sessions in the query response message that reports to described SCP; Otherwise, return error message.

In sum, described SCP selects the called subscriber according to the current multimedia conversation media information of receiving, sets up to finish session.Further, go into to exhale in the screening process, comprise the following steps: S-CSCF, call for to ask in the beginning of transmitting and carry initial multimedia conversation media information in the message to IM-SSF according to initial filter criteria iFC what session was set up; The SCP address that writes down in the trigger that IM-SSF contracts according to the user is carrying described initial multimedia conversation media information in the message that sends to this SCP; SCP judges medium type according to described initial multimedia conversation media information, and corresponding with it called user information is returned, and sets up to finish session.

In sum, carry described multimedia conversation media information by the parameter in the interface protocol message between expansion IM-SSF and the SCP; The message of perhaps expanding in the interface protocol between IM-SSF and the SCP is carried described multimedia conversation media information.Further, described interface protocol is the employed ANSI41 agreement of CDMA intelligent network.

Described SCP is the winSCP in the CDMA intelligent network.

System of the present invention, comprise: home subscribed services device HSS, intelligent business control entity SCP and S-CSCF, described system also comprises: with the Service Switching Function entity IM-SSF that HSS, SCP and S-CSCF link to each other respectively, be used for obtaining multimedia conversation media information from the IMS territory session control signaling of receiving; Interface between IM-SSF and the SCP is used for reporting the described multimedia conversation media information that obtains by IM-SSF to SCP.

Wherein, described SCP is the winSCP in the CDMA intelligent network.

Wherein, described multimedia conversation media information comprises one of following at least: medium type, the required bandwidth of medium, media transmission protocol and medium code/decode format.

Beneficial effect of the present invention is as follows:

The inventive method is IM-SSF obtains multimedia conversation media information from the IMS territory session control signaling of receiving after, carry multimedia conversation media information by the parameter in the T1 interface protocol message between expansion IM-SSF and the SCP (winSCP in the CDMA intelligent network), the message of perhaps expanding in the T1 interface protocol is carried multimedia conversation media information, multimedia conversation media information is reported corresponding SCP, thereby make this SCP can the perception multimedia conversation media information.

Further, behind described SCP sensing IMS field multimedia conversation media information, can adjust rate according to current multimedia conversation media information, and IMS territory user is chargeed; Perhaps select the called subscriber, set up to finish session.And then provide perfect IN service to IMS territory user, and reach the purpose of the winSCP that reuses original circuit domain, reduce the investment of Virtual network operator.

Description of drawings

Fig. 1 plays the flow chart of caller for the signatory PPC service concurrence of traditional circuit domain user;

Fig. 2 contracts the PPC business as called flow chart for the traditional circuit domain user;

Fig. 3 is the common call setup flow chart in IMS territory;

Fig. 4 is the media re-negotiation flow chart in the session of IMS territory;

Fig. 5 is the existing system architecture schematic diagram that the traditional circuit area intelligent service is provided to IMS territory user;

Fig. 6 for existing comprise winSCP provide the system architecture schematic diagram of traditional circuit area intelligent service to IMS territory user;

Fig. 7 is a system configuration schematic diagram of the present invention;

Fig. 8 is the inventive method flow chart of steps;

Fig. 9 is the inventive method example one flow chart;

Figure 10 is the inventive method example two flow charts;

Figure 11 is the inventive method example three flow charts;

Figure 12 is the inventive method example four flow charts;

Figure 13 is the inventive method example five flow charts;

Figure 14 is the inventive method example six flow charts;

Figure 15 is the inventive method example seven flow charts;

Figure 16 is the inventive method example eight flow charts.

Embodiment

In order to make the circuit domain intelligent business control entity can't sensing IMS field multimedia conversation media information, the invention provides a kind of system of circuit field sensing IMS field multimedia conversation media information, referring to shown in Figure 7, comprise IM-SSF, and the HSS that links to each other with described IM-SSF by the Si/Sh interface, by ISC interface and the S-CSCF that described IM-SSF links to each other, pass through the SCP (in the CDMA intelligent network, being winSCP) that T1 ' interface links to each other with described IM-SSF.

Described S-CSCF (serving session control function entity) is for IMS territory user carries out session control and registration service.When the user is in the session, S-CSCF peace preservation association speech phase, and according to the needs of Virtual network operator to service support, undertaken providing corresponding service by IM-SSF alternately by ISC interface and IM-SSF.

Described HSS deposits the data relevant with service with the user, comprising intelligent subscription data.Described intelligent subscription data can download to IM-SSF by Si interface (using the ANSI41 agreement) or Sh interface (using the diameter agreement), so that IM-SSF is mutual with corresponding SCP according to these data.

Described SCP (the intelligent business control entity winSCP in the cdma network), the session information that this entity reports according to IM-SSF provides corresponding IN service.

Described IM-SSF on the one hand as service platform (AS), receives the session control signaling of sending from S-CSCF, and obtain multimedia conversation media information from the session control signaling of receiving; On the other hand as the Service Switching Function entity, according to user's intelligence subscription data (downloading from HSS) by the Si/Sh interface, T1 interface (T1 ') by expansion, the i.e. employed ANSI41 agreement of Kuo Zhan CDMA intelligent network, provide business information (this information is extracted) to the SCP of correspondence from session control signaling, provide corresponding IN service by this SCP.And IM-SSF also needs to pass through T1 ' interface and reports the IMS field multimedia conversation media information (to comprise: the media negotiation information the when session of IMS territory is set up, and the media negotiation information in the session of IMS territory; It is one of following that described media negotiation information further comprises at least: medium type, the required bandwidth of medium, media transmission protocol and medium code/decode format), make the feature that SCP can sensing IMS field multimedia conversation, thereby perfect IN service is provided.

Use said system, the present invention also provides a kind of method of circuit field sensing IMS field multimedia conversation media information, referring to shown in Figure 8, comprises following key step:

S1, IM-SSF receive IMS territory session control signaling.

Session set up in the process or the session persistence process in, IM-SSF can receive the IMS territory session control signaling that S-CSCF sends.

S2, IM-SSF obtain multimedia conversation media information from the IMS territory session control signaling of receiving.

Described multimedia conversation media information comprises: the media negotiation information the when session of IMS territory is set up, and the media negotiation information in the session of IMS territory.Further, described media negotiation information comprises one of following at least: medium type, the required bandwidth of medium, media transmission protocol and medium code/decode format.

S3, IM-SSF report intelligent business control entity SCP with the multimedia conversation media information that obtains.

IM-SSF reports corresponding SCP at every turn after obtaining new multimedia conversation media information; Perhaps only after media negotiation finishes, directly final media negotiation object information is reported the SCP of correspondence.Described IM-SSF obtains the process of multimedia conversation media information one by one, includes but not limited to: the process of obtaining initial multimedia conversation media information (can be sky) in setting up conversation procedure; Before setting up session, increase Media Stream, and obtain the process of corresponding multimedia conversation media information; In setting up conversation procedure, after media negotiation finishes, obtain the process of corresponding multimedia conversation media information; When session persistence, in the media re-negotiation process, obtain the process of corresponding multimedia conversation media information; And during the status poll of SCP initiation session, obtain the process of current multimedia session information.

IM-SSF carries described multimedia conversation media information by the parameter in T1 ' the interface protocol message between IM-SSF after expanding and the SCP (being winSCP in the CDMA intelligent network); Perhaps IM-SSF carries described multimedia conversation media information by the message (i.e. Xin Zeng message) in the T1 ' interface protocol between IM-SSF after expanding and the SCP (being winSCP in the CDMA intelligent network), reports corresponding SCP.The described agreement that is expanded is the employed ANSI41 agreement of CDMA intelligent network.

Afterwards, described SCP adjusts rate according to the current multimedia conversation media information of receiving, and IMS territory user is chargeed; Perhaps select the called subscriber, set up to finish session.Thereby provide perfect IN service to IMS territory user.

Below specifically describe the inventive method by 8 examples.

Method example one, IMS territory user initiate caller, provide PPC (pre-payment) business by SCP to it.Referring to shown in Figure 9, comprise following concrete steps:

1.UE1 sending the beginning by P_CSCF to the S_CSCF of calling subscriber registration calls for and asks (for the purpose of omitting among the figure, P_CSCF does not draw), comprise the voice that calling will be set up in the request message, medium stream informations such as video (medium stream information comprises the encoding scheme of every kind of Media Stream that Calling Side is supported and is the information such as bandwidth of every kind of allocated for media streams), the iFC that S_CSCF contracts according to the user calls for the beginning to ask and is forwarded to IM-SSF.

The Origination_Attempt_Authorized trigger 2.IM-SSF the judgement calling subscriber has contracted, SCP address according to this recording trigger, send ORREQ (Original Request) message to SCP, except that carrying the required session information of former IN service, also need carry the medialist parameter, this parameter has comprised the beginning and has called for and ask the medium stream information that will set up in the message, these information comprise can comprise that medium type is (as voice, video etc.), host-host protocol (as RTP etc.), media formats (is the coded format of Media Stream, as the AMR of voice, EVRC coding etc.), any one or combination such as the bandwidth of Media Stream application.

3.SCP check that the calling subscriber has activated PPC business and the enough current multimedia calls of account balance support of user, then return orreq to MSC/SSF, indicating call continues.

The Calling_Routing_Address_Available trigger 4.IM-SSF the judgement calling subscriber has contracted according to the SCP address of this recording trigger, sends ANLYZD to SCP, carries the called routing iinformation that obtains according to CSI called subscriber identification.

5.SCP according to the medium stream information that carries in called routing iinformation in the ANLYZD and the ORREQ, the initial rate of decision calling subscriber conversation (is not also finished media negotiation this moment, this rate is follow-up may to change), return anlyzd to IM-SSF, indicating call continues.

6.IM-SSF handle IN service mutual after, return the beginning to S_CSCF and call for and ask message, and self is inserted in the call path.

7.S_CSCF call request is routed to callee side.

8. callee side returns 183 message to S_CSCF, the called subscriber is current only can receive the voice medium composition in indication, and voice medium the encoding scheme that branch supports (can have multiple, as to be the subclass of the encoding scheme that provides of Calling Side) is provided and is the bandwidth of voice medium flow distribution.

9. because IM-SSF has been inserted in the call path, S_CSCF gives IM-SSF with 183 forwards.

10.IM-SSF behind the medium stream information in the recording messages, by S_CSCF, P_CSCF gives the calling subscriber with this forwards.

11. the calling subscriber returns the affirmation message (PRACK) of 183 responses, carry the final speech coding scheme of selecting (only a kind of) of calling subscriber, according to receiving the routed path that writes down in 183 response messages, send to IM-SSF by S_CSCF, IM-SSF writes down this media information.

12.IM-SSF PRACK message is returned to S_CSCF.

13.S_CSCF PRACK message is mail to callee side.

14. the called subscriber returns the response message of PRACK, the media information that carries consistent with the PRACK that receives (negotiation of media streams is finished).

15. because IM-SSF has been inserted in the call path, S_CSCF is transmitted to IM-SSF with response message.

16.IM-SSF the medium stream information in the recording messages, and the medium stream information after this information set up consulted as session, by S_CSCF, P_CSCF gives the calling subscriber with this forwards.

17. the calling and called user finishes resource reservation process (concrete steps are referring to background technology 2), because IM-SSF has been inserted in the call path, if the medium stream information after having caused in the resource reservation process consulting changes, IM-SSF also can this information of perception (ordinary circumstance, resource reservation can be finished according to the medium stream information of session negotiation).

18. the called subscriber returns session response message.

19. because IM-SSF has been inserted in the call path, S_CSCF is transmitted to IM-SSF with the session response message.

The O_Answer trigger 20.IM-SSF the judgement calling subscriber has contracted, SCP address according to this recording trigger, send OANSWER message to SCP, except that carrying the required session information of former IN service, also need carry the medialist parameter, the medium stream information (behind media negotiation and resource reservation, the medium stream information of IM-SSF final entry) that this parameter will comprise session when finally setting up; After SCP received this message, the medium stream information when setting up according to final session was readjusted rate, and began the calling subscriber is chargeed.

21.IM-SSF by S_CSCF, P_CSCF gives the calling subscriber with the called subscriber answer forwards.

22～24. calling subscriber's echo reply acknowledge messages (ACK).

Annotate 1: the medium stream information of initial request also can carry in the ANLYZD message that Calling_Routing_Address_Available triggers.

Annotate 2: the medium stream information of initial request also can not report SCP, only the media information after the OANSWER information reporting is consulted to finish.

Annotate 3: though be exemplified as the PPC business, this mechanism is equally applicable to other IN services.

Method example two, IMS territory user provide PPC (pre-payment) business by SCP to it as called.Referring to shown in Figure 10, comprise following concrete steps:

1. Calling Side is called for the beginning and is asked message to be routed to the I_CSCF of called subscriber's home network, I_CSCF sends to begin to call for to the S_CSCF of called subscriber's registration and asks (for the purpose of omitting among the figure, I_CSCF does not draw), comprise the voice that calling will be set up in the request message, medium stream informations such as video (medium stream information comprises the encoding scheme of every kind of Media Stream that Calling Side is supported and is the information such as bandwidth of every kind of allocated for media streams), the iFC that S_CSCF contracts according to the called subscriber calls for the beginning to ask and is forwarded to IM-SSF.

The Initial_Termination trigger 2.IM-SSF the judgement called subscriber has contracted, SCP address according to this recording trigger, send ANLYZD (Analyzed Information) message to SCP, except that carrying the required session information of former IN service, also need carry the medialist parameter, this parameter has comprised the beginning and has called for and ask the medium stream information that will set up in the message, these information comprise that medium type is (as voice, video etc.), host-host protocol (as RTP etc.), media formats (is the coded format of Media Stream, as the AMR coding of voice, EVRC coding etc.), the bandwidth of Media Stream application etc.

3.SCP check that the called subscriber has activated the PPC business and the user has enough current multimedia calls of account balance support, then return anlyzd to IM-SSF, indicating call continues.

The Called_Routing_Address_Available trigger 4.IM-SSF the judgement called subscriber has contracted according to the SCP address of this recording trigger, sends ANLYZD message to SCP, carries the current roaming information of called subscriber.

5.SCP according to called roaming information and the medium stream information in the ANLYZD, the initial rate (also do not finish media negotiation this moment, and this rate is follow-up may to change) of decision called subscriber conversation is returned anlyzd to IM-SSF, indicating call continues.

7.S_CSCF, send the beginning by P_CSCF to the called subscriber and call for and ask message according to the address of called subscriber registration.

8～17. follow-up media negotiation and resource reservation processes are similar with the caller process, because IM-SSF is inserted in the call path, thus the media consultation process that IM-SSF can the perception session, and write down corresponding medium stream information.

18. the called subscriber returns session response message.

The T_Answer trigger 20.IM-SSF the judgement called subscriber has contracted, SCP address according to this recording trigger, send TANSWER message to SCP, except that carrying the required session information of former IN service, also need carry the medialist parameter, the medium stream information (behind media negotiation and resource reservation, the medium stream information of IM-SSF final entry) that this parameter will comprise session when finally setting up; After SCP received this message, the medium stream information when setting up according to final session was readjusted rate, and began the called subscriber is chargeed.

21.IM-SSF, send called party answer message to Calling Side by S_CSCF.

22～24. calling subscriber's echo reply acknowledge messages (ACK).

Annotate 1: the medium stream information of initial request also can carry in the ANLYZD message that Called_Routing_Address_Available triggers.

Annotate 2: the medium stream information of initial request also can not report SCP, only the media information after the TANSWER information reporting is consulted to finish.

Method example three, IMS territory user have set up voice call.In the communication process, this end subscriber has been initiated the media re-negotiation process, sets up video calling.SCP need readjust rate according to the media information after consulting.Referring to shown in Figure 11, comprise following concrete steps:

1. the calling and called both sides have set up voice call.

2. this end subscriber initiation session change wishes to increase the video media composition.Annotate: this end subscriber can also can be the called subscriber for the calling subscriber.

3. because IM-SSF has been inserted in the call path, so IM-SSF can receive this session change request message, IM-SSF detects the O/TService_Change_Request trigger, and (for the calling subscriber is O, called is T), send O/TSCR message according to this trigger corresponding address to SCP, carry the medium stream information in the current sessions change request message, current session identification (BILLINGID), user ID (MSID), and the direction of session change is initiated (direct=local) by local terminal.Annotate: the O/TService_Change_Request trigger is the intelligent contactor (not having media consultation process in the session in the traditional circuit domain) that increases newly, and O/TSCR message is the ANSI41 protocol message that increases newly; Except that medium stream information and session change direction, other parameters are the parameter of existing ANSI41 protocol definition.

There are enough remaining sum supports to increase the video composition 4.SCP judge this end subscriber, then return sky scr (otherwise can be with Reason For Denial in the scr).

5.IM-SSF the session change request message is transmitted to S_CSCF.

6.S_CSCF the session change request message is sent to the opposite end.

7. carry out media negotiation and resource reservation process (referring to background technology 2) because IM-SSF is inserted in the call path, so IM-SSF can the perception session media consultation process of change, and write down corresponding medium stream information.

8. the opposite end is returned the session change and is finished message.

9.S_CSCF this message is sent to IM-SSF.

10.IM-SSF detect (O/T) Service_Change_Complish trigger, send (O/T) SCC according to this trigger corresponding address to SCP, carry session change result (result=Success), and the media information after consulting is (if consult failure, then to carry the preceding media information of change), current session identification (BILLINGID), user ID (MSID) and consult the deadline (TOD, information such as TDO).Annotate: (O/T) SCC also is the ANSI41 message that increases newly.

11.SCP readjust rate after receiving this message, return response message.

12.IM-SSF returning renewal to this end subscriber finishes.

Annotate 1: the direction of the multimedia conversation media information of desire change and session change also can not report SCP, only the media information after (O/T) SCC information reporting is heavily consulted to finish.

Method example four, IMS territory user have set up voice call.In the communication process, end subscriber has been initiated the media re-negotiation process, set up video calling, SCP need readjust rate according to the media information after consulting.Referring to shown in Figure 12, comprise following concrete steps:

1. the calling and called both sides have set up voice call.

2. opposite end initiation session change is wished to increase the video media composition, and the session change request message sends to the S_CSCF of local terminal user attaching.

3.S_CSCF the session change request message is sent to IM-SSF.

4.IM-SSF after receiving the session change request message, IM-SSF detects (O/T) Service_Change_Request trigger, and (for the calling subscriber is O, called is T), send (O/T) SCR message according to this trigger corresponding address to SCP, carry the medium stream information in the current sessions change request message, current session identification (BILLINGID), user ID (MSID), and the direction of session change is initiated (direct=reomote) by the opposite end.

There are enough remaining sums to support the receiver, video composition 5.SCP judge this end subscriber, then return sky scr (otherwise can be with Reason For Denial in the scr).

6.IM-SSF the session change request message is sent to this end subscriber.

7. carry out media negotiation and resource reservation process.

8. local terminal returns the session change and finishes message.

9.IM-SSF detect (O/T) Service_Change_Complish trigger, send (O/T) SCC according to this trigger corresponding address to SCP, carry session change result (result=Success), and the media information after consulting is (if consult failure, then to carry the preceding media information of change), current session identification (BILLINGID), user ID (MSID) and consult the deadline (TOD, information such as TDO).

10.SCP after receiving this message, readjust rate, return response message.

11.IM-SSF returning renewal to S_CSCF finishes.

12.S_CSCF finish to end subscriber being returned upgrade.

Method example five, IMS territory calling subscriber require to set up audio call in the initial session request, require to increase Media Stream in negotiations process, become multimedia call.Referring to shown in Figure 13, comprise following concrete steps:

1～10. with method example one.

11. the calling subscriber returns the affirmation message (PRACK) of 183 responses, except that the speech coding scheme of carrying selection, also carries newly-increased video media message, promptly has audio call to become multimedia call.According to receiving the routed path that writes down in 183 response messages, send to IM-SSF by S_CSCF.

12.IM-SSF after receiving PRACK message, IM-SSF detects the O_Service_Change_Request trigger, and satisfy the condition that this trigger sets (as impose a condition be that Media Stream increases), then send OSCR message to SCP according to this trigger corresponding address, carry the medium stream information in the PRACK message, current session identification (BILLINGID), user ID (MSID), and the direction of medium change is initiated (direct=LOCAL) by local terminal.

There are enough remaining sum supports to initiate Multimedia session 13.SCP judge this end subscriber, then return sky scr (otherwise can be with Reason For Denial in the scr).

14～26. subsequent processes are with method example one.

Annotate 1: if SCP does not pay close attention to the medium change procedure, only pay close attention to final media negotiation result, then 11～13 is optional step.

Annotate 2: similar with this flow process for called flow, what difference was to trigger is the T_Service_Change_Request trigger, and in the TSCR message that reports, the medium change direction of carrying is the opposite end.

Method example six, calling subscriber do not carry media information in the initial session request, the called subscriber provides media information by the IMS territory, the calling subscriber is according to the media information that the called subscriber provides hold consultation (having only non-IMS domain user to call IMS domain user just this situation can occur, so called process only is provided).Referring to shown in Figure 14, comprise following concrete steps:

1. Calling Side is called for the beginning and is asked message to be routed to the I_CSCF of called subscriber's home network, I_CSCF sends to begin to call for to the S_CSCF of called subscriber's registration and asks (for the purpose of omitting among the figure, I_CSCF does not draw), do not comprise in the request message and exhale media information, the iFC that S_CSCF contracts according to the called subscriber calls for the beginning to ask and is forwarded to IM-SSF.

The Initial_Termination trigger 2.IM-SSF the judgement called subscriber has contracted, SCP address according to this recording trigger, send ANLYZD (Analyzed Information) message to SCP, except that carrying the required session information of former IN service, optionally carry the medialist parameter, its content is empty.Annotate: also can not carry the medialist parameter.

3.SCP check that the called subscriber has activated the PPC business and the user has enough account balances, then return anlyzd to IM-SSF, indicating call continues.

5.SCP, determine called initial rate (also do not have media information this moment, and this rate is follow-up may to change) of being user's communication according to the called roaming information in the ANLYZD, return anlyzd to IM-SSF, indicating call continues.

8. the called subscriber returns 183 message to S_CSCF, and the media information of the current selection of indication called subscriber comprises the voice that calling will be set up, medium stream informations such as video.

10.IM-SSF after receiving 183 message, IM-SSF detects the T-Service_Change_Request trigger, and satisfy the condition that this trigger sets (as impose a condition be that Media Stream increases), then send TSCR message to SCP according to this trigger corresponding address, carry the medium stream information in 183 message, current session identification (BILLINGID), user ID (MSID), and the direction of medium change is initiated (direct=LOCAL) by local terminal.

There are enough remaining sums to receive Multimedia session 11.SCP judge this end subscriber, then return sky scr (otherwise can be with Reason For Denial in the scr).

12.IM-SSF give the calling subscriber with this forwards by S_CSCF.

13. the calling subscriber returns the affirmation message (PRACK) of 183 responses, carry the media information (audio frequency) that the calling subscriber selects, according to receiving the routed path that writes down in 183 response messages, send to IM-SSF by S_CSCF, IM-SSF writes down this media information (because this media information is the subclass of the media information that comprises of 183 message, so can not trigger the T_Service_Change_Request trigger).

14.IM-SSF PRACK message is returned to S_CSCF.

15～26. subsequent processes are with method example two.

Annotate 1: the multimedia conversation media information that callee side is selected also can not report SCP, only the media information after the TANSWER information reporting is consulted to finish.

Annotate 2: in this method example, also can add the flow process that increases Media Stream.The SCP address that writes down in the trigger that to be IM-SSF contract according to the user is carrying the multimedia conversation media information that callee side is selected, the multimedia conversation media information of the medium type correspondence of increase, and the direction of medium change in the message that sends to this SCP.

Method example seven, SCP initiatively inquire about the state of current sessions to IM-SSF.Referring to shown in Figure 15, comprise following concrete steps:

1. the calling and called both sides have set up the multimedia conversation.

2.SCP session status detect timer expiry after, need the inspection user state, send CCDIR message to IM-SSF, comprise current session identification (BILLINGID), user ID (MSID), SCP and identify information such as (MSCID).Annotate: the purpose of SCP check session status is to solve SCP and the inconsistent problem of IM-SSF both sides session status, after IM-SSF transmission (O/T) ANSWER message, enter session and set up state, but SCP also is not in the user answer state of waiting for because fault is received this message.

3.IM-SSF after receiving this message, IM-SSF checks corresponding session status according to BILLID and MSID, does not discharge if call out, then returns ccdir, carries the medialist parameter in the message, indicates the current media information that carries out session; Otherwise, return error message.

More than seven method examples all be to be example with the PPC IN service, but this mechanism is not limited only to the PPC IN service, other IN services also can be used this mechanism and come to provide IN service to IMS territory user.

Method example eight, IMS territory user's ICS have contracted (going into to exhale screening) IN service can be selected different processing according to the medium type of going into to exhale, if audio call then handle by this user, if multimedia call then before forwards another user to.Referring to shown in Figure 16, comprise following concrete steps:

1. Calling Side is called for the beginning and is asked message to be routed to the I_CSCF of called subscriber B home network, I_CSCF sends to begin to call for to the S_CSCF of called subscriber's registration and asks (for the purpose of omitting among the figure, I_CSCF does not draw), comprise the sign (request_url carries) of called subscriber B in the request message and call out the voice that to set up, medium stream informations such as video (medium stream information comprises the encoding scheme of every kind of Media Stream that Calling Side is supported and is the information such as bandwidth of every kind of allocated for media streams), the iFC that S_CSCF contracts according to the called subscriber calls for the beginning to ask and is forwarded to IM-SSF.

2.IM-SSF receive the beginning call for ask after, judge called subscriber's Advance_Termination trigger of having contracted, SCP address according to this recording trigger, send ANLYZD message to SCP, except that carrying the required session information of former ICS IN service, also need carry the medialist parameter, this parameter has comprised the beginning and has called for and ask the medium stream information that will set up in the message.

3.SCP judge that according to the medialist parameter this calling is multimedia call, need Call Forwarding to arrive user C, then return anlyzd message to IM-SSF, comprise the termlist parameter, comprise the information of forwarding subscriber C.

4.IM-SSF after receiving this message,, re-construct the beginning to call for and ask message, change called party information into user C (revising request_url), and the amended beginning called for ask message to return S_CSCF according to the termlist parameter.

5.S_CSCF this beginning called for asks message to be routed to the network that user C is belonged to.

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

Claims

1. the method for a circuit field sensing IMS field multimedia conversation media information is characterized in that, comprises the following steps:

Service Switching Function entity IM-SSF obtains multimedia conversation media information from the IMS territory session control signaling of receiving; And

IM-SSF reports intelligent business control entity SCP with the multimedia conversation media information that obtains.

2. the method for claim 1 is characterized in that, described multimedia conversation media information comprises: the media negotiation information the when session of IMS territory is set up, and the media negotiation information in the session of IMS territory.

3. method as claimed in claim 2 is characterized in that, it is one of following that described media negotiation information comprises at least: medium type, the required bandwidth of medium, media transmission protocol and medium code/decode format.

4. as each described method of claim 1 to 3, it is characterized in that described SCP adjusts rate according to the current multimedia conversation media information of receiving, and IMS territory user is chargeed.

5. method as claimed in claim 4 is characterized in that, sets up in the process in the calling and called session, comprises the following steps:

6. method as claimed in claim 5 is characterized in that, also comprises step before the described steps A 1:

7. method as claimed in claim 5 is characterized in that, Calling Side or callee side initiated to increase the process of Media Stream before described steps A 1.

8. method as claimed in claim 7 is characterized in that, before the described steps A 1, if after described SCP is known initial multimedia conversation media information, increases medium type again, then comprises step:

The SCP address that writes down in the trigger that E11, IM-SSF contract according to the user carries the medium type of described increase and the direction of medium change at least in the message that sends to this SCP.

9. method as claimed in claim 7 is characterized in that, if IMS territory user provides multimedia conversation media information as the called subscriber, also comprises step before the then described steps A 1:

C12, S-CSCF be according to initial filter criteria iFC, calls for to ask in the beginning of transmitting to IM-SSF and do not carry multimedia conversation media information in the message;

The SCP address that writes down in the trigger that D12, IM-SSF contract according to the user is not carrying multimedia conversation media information in the message that sends to this SCP;

After E12, callee side selected multimedia conversation media information, the SCP address that writes down in the trigger that IM-SSF contracts according to the user was carrying the multimedia conversation media information that callee side is selected in the message that sends to this SCP, and the direction of medium change.

10. method as claimed in claim 9 is characterized in that, before the described steps A 1, if increase medium type, also comprises step after the then described step e 12:

The SCP address that writes down in the trigger that F12, IM-SSF contract according to the user carries the medium type of increase and the direction of medium change at least in the message that sends to this SCP.

11. method as claimed in claim 4 is characterized in that, if in the conversation procedure media re-negotiation takes place, then comprises the following steps:

A2, finish media re-negotiation after, S-CSCF informs IM-SSF with the media re-negotiation object information;

The SCP address that writes down in the trigger that B2, IM-SSF contract according to the user is carrying described media re-negotiation object information in the message that sends to this SCP.

12. method as claimed in claim 11 is characterized in that, also comprises step: S-CSCF according to initial filter criteria iFC before the described steps A 2, carries the multimedia conversation media information of desire change in the session change request message of transmitting to IM-SSF;

The SCP address that writes down in the trigger that IM-SSF contracts according to the user is carrying the multimedia conversation media information of desire change in the message that sends to this SCP, and the direction of session change.

13. as each described method of claim 1 to 3, it is characterized in that, if the status poll of SCP initiation session then comprises the following steps:

After IM-SSF receives query messages, the session status corresponding with it according to the session information inspection of carrying in the query messages, if this session is not released, then IM-SSF carries the employed multimedia conversation media information of current sessions in the query response message that reports to described SCP; Otherwise, return error message.

14., it is characterized in that described SCP selects the called subscriber according to the current multimedia conversation media information of receiving as each described method of claim 1 to 3, set up to finish session.

15. method as claimed in claim 14 is characterized in that, goes into to exhale in the screening process what session was set up, comprises the following steps:

S-CSCF is according to initial filter criteria iFC, calls for to ask in the beginning of transmitting to IM-SSF and carries initial multimedia conversation media information in the message;

The SCP address that writes down in the trigger that IM-SSF contracts according to the user is carrying described initial multimedia conversation media information in the message that sends to this SCP;

SCP judges medium type according to described initial multimedia conversation media information, and corresponding with it called user information is returned, and sets up to finish session.

16. as each described method of claim 1 to 3, it is characterized in that, carry described multimedia conversation media information by the parameter in the interface protocol message between expansion IM-SSF and the SCP; The message of perhaps expanding in the interface protocol between IM-SSF and the SCP is carried described multimedia conversation media information.

17. method as claimed in claim 16 is characterized in that, described interface protocol is the employed ANSI41 agreement of CDMA intelligent network.

18. the method for claim 1 is characterized in that, described SCP is the winSCP in the CDMA intelligent network.

19. the system of a circuit field sensing IMS field multimedia conversation media information comprises: home subscribed services device HSS, intelligent business control entity SCP and S-CSCF is characterized in that described system also comprises:

With the Service Switching Function entity IM-SSF that HSS, SCP and S-CSCF link to each other respectively, be used for obtaining multimedia conversation media information from the IMS territory session control signaling of receiving;

Interface between IM-SSF and the SCP is used for reporting the described multimedia conversation media information that obtains by IM-SSF to SCP.

20. system as claimed in claim 19 is characterized in that, described SCP is the winSCP in the CDMA intelligent network.

21. system as claimed in claim 19 is characterized in that, it is one of following that described multimedia conversation media information comprises at least: medium type, the required bandwidth of medium, media transmission protocol and medium code/decode format.