CN102202042B - A kind of IMS system realizes the method and system of color image service - Google Patents

A kind of IMS system realizes the method and system of color image service Download PDF

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CN102202042B
CN102202042B CN201010140729.0A CN201010140729A CN102202042B CN 102202042 B CN102202042 B CN 102202042B CN 201010140729 A CN201010140729 A CN 201010140729A CN 102202042 B CN102202042 B CN 102202042B
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polychrome
called subscriber
calling subscribe
response
caller
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CN102202042A (en
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李世涛
丁欣
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ZTE Corp
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ZTE Corp
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Abstract

The invention discloses the method and system realizing color image service in a kind of IMS system: called subscriber responds the conversation request that calling subscribe sends, calling polychrome application server (CRS? AS) according to conversation request in response to determining that called subscriber support early conversational mode time, caller CRS? polychrome early session Session Description Protocol (SDP) request is sent to called subscriber by more newly requested by AS; The information of the polychrome media that the calling subscribe that called subscriber comprises according to polychrome early session SDP Request provides, it is determined that when self supporting polychrome early session SDP Request, by updating response to caller CRS? AS returns polychrome early session SDP response; Caller CRS? AS controls the broadcasting of polychrome media according to polychrome early session SDP response. By means of the invention it is possible to solve the problem that called subscriber does not support the caller caused during the polychrome media that calling subscribe provides and called subscriber cannot set up session.

Description

A kind of IMS system realizes the method and system of color image service
Technical field
The present invention relates to the communications field, particularly relate to a kind of IP Multimedia System (IMS) realizes the method and system of color image service
Background technology
In prior art, at IP Multimedia System (IMS, IPMultimediaCoreNetworkSubsystem) network can have been implemented color image service: during calling subscriber calls called subscriber, it is possible to display or playing and calling user pre-set in the terminal of called subscriber word, picture, audio frequency, the media file such as video.
It it is the Organization Chart disposing color image service in a kind of IMS network shown in Fig. 1, including calling subscribe 101, called subscriber 106, for performing the calling service conversation control function entity (S-CSCF, ServingCallSessionControlFunction) 102 of service call conversation control function and terminating S-CSCF 104, the polychrome application server of color image service is provided: caller CRSAS (CustomizedRingingSignalApplicationServer) 103 and called CRSAS105.
Based on the framework shown in Fig. 1, existing employing early conversational mode plays the flow process of polychrome as in figure 2 it is shown, include:
Step 201, calling subscribe is initiated a session request by IMS network;
Step 202, when originating S-CSCF receives conversation request, according to calling subscribe contract color image service time the strategy that specifies this conversation request is sent on caller CRSAS;
Step 203, calling subscribe is supported that the ability label of early conversational mode is inserted in conversation request and returns again to originating S-CSCF by caller CRSAS;
Step 204, conversation request is sent to terminating S-CSCF by originating S-CSCF;
Step 205, conversation request is sent to called subscriber by terminating S-CSCF;
Step 206, after called subscriber receives conversation request, replys reliability 180 to terminating S-CSCF and responds, wherein comprise called subscriber and support the ability label of early conversational mode, now, according to 3GPPts24.183 protocol requirement, called subscriber wouldn't start local incoming call prompting;
Step 207, reliability 180 response is sent to originating S-CSCF by terminating S-CSCF;
Step 208, reliability 180 response is sent to caller CRSAS by originating S-CSCF again, and thus, caller CRSAS determines that called subscriber also supports early conversational mode;
Step 209, reliability 180 response is returned to originating S-CSCF by caller CRSAS again;
Step 210, reliability 180 response is transmitted to calling subscribe by originating S-CSCF;
Step 211, after calling subscribe receives reliability 180 response, sends Temporary Response (PRACK) to originating S-CSCF;
Step 212, Temporary Response is sent to caller CRSAS by originating S-CSCF;
Step 213, after caller CRSAS receives Temporary Response, insert polychrome early session Session Description Protocol (SDP wherein, SessionDescriptionProtocol) request (wherein comprises the information of the polychrome media that calling subscribe provides, for carrying out the negotiation of polychrome media with called subscriber), and it is sent to originating S-CSCF;
Step 214��step 215, the Temporary Response carrying polychrome early session SDP Request is sent to called subscriber by terminating S-CSCF by originating S-CSCF;
Step 216��step 217, during the polychrome media that called subscriber supports the polychrome media in polychrome early session SDP Request, namely calling subscribe provides, give response to Temporary Response, the Temporary Response response carrying polychrome early session SDP response is sent to originating S-CSCF by terminating S-CSCF.
Step 218, Temporary Response response is transmitted to caller CRSAS by originating S-CSCF, now caller and called between the negotiation of polychrome media just complete, caller CRSAS notifies that polychrome is play WMG and is prepared as the polychrome media that called subscriber playing and calling user provides;
Step 219��step 220, the early session SDP response of the polychrome in Temporary Response response is deleted by caller CRSAS, and is transmitted to calling subscribe by originating S-CSCF;
Now, called subscriber just can receive the polychrome media that calling subscribe provides.
Step 221, when called subscriber receives polychrome media, it is possible to starting local incoming call prompting, now, current calling is carried out response by called subscriber, sends 200OK response to terminating S-CSCF;
Step 222,200OK response is sent to originating S-CSCF by terminating S-CSCF;
Step 223,200OK response is sent to caller CRSAS by originating S-CSCF again, according to 200OK response, caller CRSAS determines that called subscriber has carried out response, and according to calling subscribe contract color image service time the strategy notice polychrome that specifies play WMG and stop playing, to called subscriber, the polychrome media that described calling subscribe provides;
Step 224,200OK response is transmitted to originating S-CSCF by caller CRSAS, in this step and step 223 caller CRSAS receive 200OK after operation can carry out simultaneously;
Step 225,200OK response is transmitted to calling subscribe by originating S-CSCF;
Step 226, after calling subscribe receives 200OK response, returns ACK to called subscriber and confirms, then calling subscribe and called subscriber can converse.
In above-mentioned flow process, Internet Engineering Task group (IETF, TheInternetEngineeringTaskForce) calling subscribe is carried SDP Request in Temporary Response and has carried out specification by agreement: only when the other user (called subscriber) will not refuse the SDP Request self initiated to active user (calling subscribe) certainly, active user could carry this SDP Request in Temporary Response. But, in the practical application of color image service, calling subscribe can not determine that called subscriber can refuse SDP Request that calling subscribe initiates scarcely, namely not can determine that the polychrome media that called subscriber is bound to support self to provide; If called subscriber cannot support the polychrome media that calling subscribe provides, when but receiving SDP Request (comprising the information of the polychrome media that calling subscribe provides) in the Temporary Response that calling subscribe sends, called subscriber needs to refuse this SDP Request, but for this situation, existing SDP agreement does not have how regulation called subscriber should refuse this SDP Request, in actual application, generally can adopt the mode as shown in Fig. 3 step 316��321 (realizing of step 301��315 and step 201��215 is identical):
Step 316, after called subscriber receives Temporary Response, the information of the polychrome media that the calling subscribe in wherein polychrome early session SDP Request provides is analyzed, when called subscriber determine can not support these polychrome media time, to calling subscribe return 488 refusals response (to terminating S-CSCF send 488 refusal response).
Step 317��320, terminating S-CSCF is refused response by 488 and is sent to calling subscribe;
Step 321, when caller receives 488 refusal response, it is believed that called subscriber have rejected this conversation request, thus terminating this conversation request, then the session connection failure between calling subscribe and called subscriber.
Can be seen that, when called subscriber does not simply support the polychrome media that calling subscribe provides, according to the response that called subscriber returns, calling subscribe will be considered that called subscriber have rejected this conversation request, then calling subscribe can directly terminate the foundation of conversation request, namely between calling and called, normal session all cannot be set up, both sides cannot be carried out call, obviously, this result be not called subscriber and calling subscribe desired.
Summary of the invention
In view of this, present invention is primarily targeted at the method and system realizing color image service is provided in a kind of IMS system, it is possible to the problem that the caller caused when solving the polychrome media that called subscriber do not support calling subscribe to provide and called subscriber cannot set up session.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
The invention provides a kind of method realizing color image service in IMS system, the method includes:
Called subscriber responds the conversation request that calling subscribe sends, calling polychrome application server (CRSAS) according to described conversation request in response to determining that called subscriber support early conversational mode time, polychrome early session SDP Request is sent to called subscriber by more newly requested by described caller CRSAS;
The information of the polychrome media that the calling subscribe that described called subscriber comprises according to early session Session Description Protocol (SDP) request of described polychrome provides, when determining self the described polychrome of support early session SDP Request, return polychrome early session SDP response by updating response to described caller CRSAS; Described caller CRSAS controls the broadcasting of polychrome media according to the early session SDP response of described polychrome.
Further, when described called subscriber has the resource that can be used for session establishment and supports conversational mode morning, the response to described conversation request is that reliability 180 responds;
When described called subscriber not can be used for the resource of session establishment and supports conversational mode morning, the response to described conversation request is 183 responses.
Further, described reliability 180 responds or carries called subscriber in 183 responses supports the ability label of early conversational mode, according to described ability label, described caller CRSAS determines that called subscriber supports early conversational mode.
Further, described called subscriber determines self the described polychrome of support early session SDP Request, particularly as follows:
The information of the polychrome media that described called subscriber provides according to described calling subscribe, it is determined that when self supports the polychrome media that described calling subscribe provides, it is determined that self support described polychrome early session SDP Request.
Further, when described called subscriber determines self the described polychrome of support early session SDP Request, described caller CRSAS controls the broadcasting of polychrome media, particularly as follows: described caller CRSAS notifies that the polychrome media that described calling subscribe is provided by polychrome broadcasting WMG play out to described called subscriber.
Further, the information of the polychrome media that described called subscriber provides according to described calling subscribe, it is determined that when self not supporting described polychrome early session SDP Request, the method farther includes:
The port numbers that in the information of the polychrome media that described calling subscribe is provided by described called subscriber, all media are corresponding is set to 0, and returns to described caller CRSAS by updating response.
Further, when described called subscriber receives the polychrome media that described calling subscribe provides, or described called subscriber determines that when self not supporting described polychrome early session SDP Request, the method farther includes:
The session that described calling subscribe is initiated by described called subscriber carries out response, and sends 200OK response by described caller CRSAS to described calling subscribe;
When described calling subscribe receives described 200OK response, return ACK to described called subscriber and confirm, the session establishment between described calling subscribe and called subscriber.
Further, described called subscriber receives the polychrome media that described calling subscribe provides, by described caller CRSAS to calling subscribe send 200OK response time, the method farther includes: after described caller CRSAS receives 200OK response, according to described calling subscribe contract color image service time specify strategy notice polychrome play WMG stop to called subscriber play described calling subscribe provide polychrome media.
Present invention also offers the system realizing color image service in a kind of IMS system, this system includes: calling subscribe, called subscriber and caller CRSAS;
Described calling subscribe, for sending conversation request to described called subscriber;
Described called subscriber, for responding described conversation request; What be additionally operable to reception caller CRSAS transmission carries the more newly requested of polychrome early session SDP Request the information of the polychrome media of calling subscribe's offer that early session SDP Request comprises according to described polychrome, it is determined that self support described polychrome session SDP Request morning;
Described caller CRSAS, for according to described called subscriber to described conversation request in response to determining that described called subscriber support early conversational mode time, polychrome early session SDP Request is sent to called subscriber by more newly requested; It is additionally operable to, when described called subscriber supports described polychrome early session SDP Request, control the broadcasting of polychrome media.
Described called subscriber is further used for, information according to the polychrome media that described calling subscribe provides, determine when self not supporting described polychrome early session SDP Request, the port numbers that in the information of the polychrome media described calling subscribe provided, all media are corresponding is set to 0, and returns to described caller CRSAS by updating response.
Described called subscriber is further used for, when receiving the polychrome media that described calling subscribe provides, or determine when self not supporting described polychrome early session SDP Request, the session that described calling subscribe is initiated carries out response, and sends 200OK response by described caller CRSAS to described calling subscribe;
Described calling subscribe is further used for, and when receiving described 200OK response, returns ACK to described called subscriber and confirms, the session establishment between described calling subscribe and called subscriber.
The method and system of color image service is realized based on the present invention, when called subscriber supports early conversational mode, directly by caller CRSAS, polychrome early session SDP Request more newly requested is sent to called subscriber by one, more newly requested exclusively carries out the negotiation of polychrome media between calling subscribe and called subscriber by this; So, when called subscriber does not support polychrome early session SDP Request, called subscriber can refuse polychrome early session SDP Request for more newly requested to caller CRSAS, so, calling subscribe still can be carried out normal session response by called subscriber, without influence on the normal session establishment of both sides.
Accompanying drawing explanation
Fig. 1 is the Organization Chart disposing color image service in IMS network;
Fig. 2 adopts early conversational mode to play the schematic flow sheet of polychrome in prior art;
Fig. 3 is that under existing polychrome broadcast mode, called subscriber refuses the flow chart of polychrome;
Fig. 4 is that the present invention adopts early conversational mode to play the schematic flow sheet of polychrome;
Fig. 5 is that under polychrome broadcast mode of the present invention, called subscriber refuses the flow chart of polychrome;
Fig. 6 is the system structure schematic diagram that the present invention realizes color image service.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.
In the present invention, when called subscriber supports early conversational mode, directly by caller CRSAS, polychrome early session SDP Request more newly requested is sent to called subscriber by one, more newly requested exclusively carries out the negotiation of polychrome media between calling subscribe and called subscriber by this. Wherein, the negotiation of polychrome media is based in polychrome early session SDP Request the information of the polychrome media that the calling subscribe comprised provides.
The playing flow of polychrome media of the present invention as shown in Figure 4, comprises the following steps:
Realizing of step 401��410 and step 201��210 is identical, repeats no more herein.
Step 411, in a step 408, the called subscriber that caller CRSAS carries in responding according to reliability 180 supports the ability label of early conversational mode, may determine that called subscriber supports early conversational mode, now, polychrome early session SDP Request (information comprising the polychrome media that calling subscribe provides) is sent to originating S-CSCF by more newly requested by caller CRSAS, and this step can carry out with step 409��410 simultaneously.
Step 412��413, originating S-CSCF is sent to called subscriber by terminating S-CSCF by more newly requested.
Step 414, called subscriber analyzes the information of the polychrome media that the calling subscribe in polychrome early session SDP Request provides, when being determined to support these polychrome media, return polychrome session SDP response (send to terminating S-CSCF and update response) by updating response to calling subscribe.
Step 415��416, the renewal response carrying polychrome session SDP response is sent to caller CRSAS by originating S-CSCF by terminating S-CSCF, now caller and called between the negotiation of polychrome media just complete, caller CRSAS notifies that polychrome is play WMG and is prepared as the polychrome media that called subscriber playing and calling user provides.
It should be noted that now caller CRSAS is without returning again to renewal response to calling subscribe.
Step 417, while called subscriber receives polychrome media, it is possible to start local incoming call prompting, current conversation request carries out response, return 200OK response.
Realizing of the realization of step 418��422 and step 222��226 is identical, repeats no more herein.
The realization of this flow process is based on calling subscribe and called subscriber have resource can situation, wherein resource can with referring to that reserved resource may be used for the foundation of session. In the flow process of Fig. 4, after called subscriber receives conversation request, this conversation request is responded, when determine self have resource can use time, returning 180 responses (Fig. 4 is that reliability 180 responds), wherein reliability 180 response refers to that also carrying called subscriber in this 180 response supports the ability label of early conversational mode; When called subscriber determine self do not have resource can use time, return 183 responses, in this 183 response, also portability called subscriber supports the ability label of early conversational mode, represents called and supports early conversational mode. In the flow process of Fig. 4, when calling subscribe receives 183 response, calling subscribe sends a Temporary Response to called subscriber, negotiation for available resources, it should be noted that when caller CRSAS receives this Temporary Response, it is not necessary to insert polychrome early session SDP Request. Wherein, the negotiation of available resources can carry out with the negotiation of step 411��416 polychrome media simultaneously.
Based on the polychrome broadcast mode of the present invention, called subscriber refuses the flow process of polychrome as it is shown in figure 5, include:
The realization of step 501��513, with step 401��413, repeats no more herein.
Step 514, when the information of the polychrome media that called subscriber provides according to more newly requested middle calling subscribe determine self do not support these polychrome media time, the port numbers that in the information of polychrome media calling subscribe provided, all media are corresponding is set to 0, and returns to caller CRSAS by updating response. Wherein, calling subscribe provide polychrome media be likely to comprise media, such as audio frequency, video, image etc., in the information of the polychrome media carried in polychrome early session SDP Request, a port numbers that every kind of media are all corresponding, when any media therein are not supported by called subscriber, just port corresponding for all media is all set to 0, it was shown that self do not support the polychrome media that calling subscribe provides.
Step 515��516, this renewal should be sent to caller CRSAS by band by originating S-CSCF by terminating S-CSCF. Caller CRSAS is according to updating the situation that port numbers is 0 that in response, media are corresponding, it is determined that when called subscriber does not support the polychrome media that calling subscribe provides, and does not notify that polychrome is play WMG and play polychrome, also this renewal response is not sent to calling subscribe.
Step 517, when called determine self do not support polychrome media that caller provides time, it is possible to start local incoming call prompting, current conversation request carried out response, namely returns 200OK response.
Step 518��522,200OK response is sent to calling subscribe by terminating S-CSCF, and calling subscribe, according to 200OK response, returns ACK to called subscriber and confirms, then the session establishment between calling subscribe and called subscriber, it is possible to converse. Wherein, when caller CRSAS receives 200OK response, owing to not carrying out the broadcasting of polychrome, so caller CRSAS does not carry out any operation about polychrome, directly 200OK response is passed through originating S-CSCF.
From the flow process of Fig. 5 it can be seen that when the polychrome media that called subscriber does not support caller to provide, it is possible to be directed to more newly requested, refuse polychrome early session SDP Request to caller CRSAS, and the foundation of normal conversation between calling subscribe and called subscriber is not affected.
For realizing the method that above-mentioned polychrome is play, the invention provides the system realizing color image service in a kind of IMS system, this system includes as shown in Figure 6: calling subscribe 10, called subscriber 20 and caller CRSAS30;
Calling subscribe 10, for sending conversation request to called subscriber 20;
Called subscriber 20, for conversation request is responded; What be additionally operable to reception caller CRSAS30 transmission carries the more newly requested of polychrome early session SDP Request the information of the polychrome media of calling subscribe 10 offer that early session SDP Request comprises according to polychrome, it is determined that self support polychrome session SDP Request morning;
Caller CRSAS30, for according to called subscriber 20 to conversation request in response to determining that called subscriber support early conversational mode time, polychrome early session SDP Request is sent to called subscriber 20 by more newly requested; It is additionally operable to, when called subscriber 20 supports polychrome early session SDP Request, control the broadcasting of polychrome media.
Called subscriber 20 is further used for, information according to the polychrome media that calling subscribe 10 provides, determine when self not supporting polychrome early session SDP Request, the port numbers that in the information of polychrome media calling subscribe 10 provided, all media are corresponding is set to 0, and returns to caller CRSAS30 by updating response.
Called subscriber 20 is further used for, when receiving the polychrome media that calling subscribe 10 provides, or determine that when self not supporting polychrome early session SDP Request, the session that calling subscribe 10 is initiated carries out response, and sends 200OK response by caller CRSAS30 to calling subscribe 10;
Calling subscribe 10 is further used for, and when receiving 200OK response, returns ACK to called subscriber 20 and confirms, the session establishment between calling subscribe 10 and called subscriber 30.
It addition, based on the framework of Fig. 1 and the flow process of Fig. 4 and Fig. 5 it can be seen that when carrying out color image service, need through originating S-CSCF, caller CRSAS30 and terminating S-CSCF alternately between calling subscribe and called subscriber; When calling subscribe 10 and caller CRSAS30 interact, it is necessary to need through terminating S-CSCF when interacting through originating S-CSCF, caller CRSAS30 and called subscriber 20.
The above, be only presently preferred embodiments of the present invention, is not intended to limit protection scope of the present invention.

Claims (8)

1. the method realizing color image service in an IMS system, it is characterised in that the method includes:
Called subscriber responds the conversation request that calling subscribe sends, calling polychrome application server (CRSAS) according to described conversation request in response to determining that called subscriber support early conversational mode time, polychrome early session SDP Request is sent to called subscriber by more newly requested by described caller CRSAS;
The information of the polychrome media that the calling subscribe that described called subscriber comprises according to early session Session Description Protocol (SDP) request of described polychrome provides, when determining self support described polychrome early session SDP Request, return polychrome early session SDP response by updating response to described caller CRSAS; Described caller CRSAS controls the broadcasting of polychrome media according to the early session SDP response of described polychrome;
Information when the polychrome media that described called subscriber provides according to described calling subscribe, determine when self not supporting described polychrome early session SDP Request, the port numbers that in the information of the polychrome media that described calling subscribe is provided by described called subscriber, all media are corresponding is set to 0, and returns to described caller CRSAS by updating response;
Wherein, when described called subscriber has the resource that can be used for session establishment and supports conversational mode morning, the response to described conversation request is that reliability 180 responds;
When described called subscriber not can be used for the resource of session establishment and supports conversational mode morning, the response to described conversation request is 183 responses;
Described reliability 180 responds or carries called subscriber in 183 responses supports the ability label of early conversational mode.
2. the method realizing color image service according to claim 1 in IMS system, it is characterised in that according to described ability label, described caller CRSAS determines that called subscriber supports early conversational mode.
3. the method realizing color image service according to claim 1 in IMS system, it is characterised in that described called subscriber determines and self supports described polychrome early session SDP Request, particularly as follows:
The information of the polychrome media that described called subscriber provides according to described calling subscribe, it is determined that when self supports the polychrome media that described calling subscribe provides, it is determined that self support described polychrome early session SDP Request.
4. the method realizing color image service according to claim 3 in IMS system, it is characterized in that, when described called subscriber determines self the described polychrome of support early session SDP Request, described caller CRSAS controls the broadcasting of polychrome media, particularly as follows: described caller CRSAS notifies that the polychrome media that described calling subscribe is provided by polychrome broadcasting WMG play out to described called subscriber.
5. the method realizing color image service according to claim 4 in IMS system, it is characterized in that, when described called subscriber receives the polychrome media that described calling subscribe provides, or described called subscriber determines that when self not supporting described polychrome early session SDP Request, the method farther includes:
The session that described calling subscribe is initiated by described called subscriber carries out response, and sends 200OK response by described caller CRSAS to described calling subscribe;
When described calling subscribe receives described 200OK response, return ACK to described called subscriber and confirm, the session establishment between described calling subscribe and called subscriber.
6. the method realizing color image service according to claim 5 in IMS system, it is characterized in that, described called subscriber receives the polychrome media that described calling subscribe provides, by described caller CRSAS to calling subscribe send 200OK response time, the method farther includes: after described caller CRSAS receives 200OK response, according to described calling subscribe contract color image service time specify strategy notice polychrome play WMG stop to called subscriber play described calling subscribe provide polychrome media.
7. an IMS system realizes the system of color image service, it is characterised in that this system includes: calling subscribe, called subscriber and caller CRSAS;
Described calling subscribe, for sending conversation request to described called subscriber;
Described called subscriber, for responding described conversation request; What be additionally operable to reception caller CRSAS transmission carries the more newly requested of polychrome early session SDP Request the information of the polychrome media of calling subscribe's offer that early session SDP Request comprises according to described polychrome, when determining self support described polychrome session SDP Request morning;
Described caller CRSAS, for according to described called subscriber to described conversation request in response to determining that described called subscriber support early conversational mode time, polychrome early session SDP Request is sent to called subscriber by more newly requested; It is additionally operable to, when described called subscriber supports described polychrome early session SDP Request, control the broadcasting of polychrome media;
Described called subscriber, the information of the polychrome media for providing as described calling subscribe, determine when self not supporting described polychrome early session SDP Request, the port numbers that in the information of the polychrome media described calling subscribe provided, all media are corresponding is set to 0, and returns to described caller CRSAS by updating response;
When described called subscriber has the resource that can be used for session establishment and supports conversational mode morning, the response to described conversation request is that reliability 180 responds;
When described called subscriber not can be used for the resource of session establishment and supports conversational mode morning, the response to described conversation request is 183 responses;
Described reliability 180 responds or carries called subscriber in 183 responses supports the ability label of early conversational mode.
8. IMS system realizes the system of color image service according to claim 7, it is characterised in that
Described called subscriber is further used for, when receiving the polychrome media that described calling subscribe provides, or determine when self not supporting described polychrome early session SDP Request, the session that described calling subscribe is initiated carries out response, and sends 200OK response by described caller CRSAS to described calling subscribe;
Described calling subscribe is further used for, and when receiving described 200OK response, returns ACK to described called subscriber and confirms, the session establishment between described calling subscribe and called subscriber.
CN201010140729.0A 2010-03-24 2010-03-24 A kind of IMS system realizes the method and system of color image service Expired - Fee Related CN102202042B (en)

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