CN101222540A - Multimedia service implementing method for IP multimedia subsystem - Google Patents

Abstract

The invention provides a multimedia service realization method for an IP multimedia subsystem, which comprises the following steps: when a call party initiates a call process to a called party, a PSS AS initiates a call to a multimedia AS; the multimedia AS plays a multimedia before the call party or the called party enters the call state; and when the call party or the called party enters the call state, the PSS AS requests the multimedia AS to stop playing the multimedia.

Description

The multimedia service implementation method that is used for IP Multimedia System

Technical field

The present invention relates to the communications field, more specifically, relate to multimedia service (for example, Ring Back Tone service and the color image service) implementation method that is used for IP Multimedia System.

Background technology

Along with networks development, people are more and more to the demand of communication, wish to have in communication colourful user experience.

Traditional communication network: as fixed telephone network (PSTN), mobile telephone network (PLMN), and emerging NGN network in, when calling is called, the whether ring of callee's terminal equipment is judged in caller, by hear one section repetition " too ... pout " ring-back tone judge.And the callee can be by the caller rs number that shows on the terminal equipment, judges calling party's identity, Here it is CLIP service.

New network technology, the ring-back tone that can allow the calling party hear, no longer be simple, machine-made " too ... pout " sound, but can allow the user hear various sound, comprise melodious music, interesting message etc., company and government organs can allow ring-back tone become the exploitation of this mechanism.This is called Ring Back Tone service (or personalized ring back tone service).If calling terminal is supported video capability, Ring Back Tone service also can be put one section video image to caller.This business is provided with by the called subscriber, and CRBT is used for playing to the calling party.Can play corresponding CRBT file to the calling subscriber according to the prior preset condition of called subscriber.For example, can play different CRBT files according to calling subscriber's difference, the different CRBT file of playing in the different time periods.

Callee's terminal can no longer be play simple ring back tone when receiving when incoming call, and network can be to one section sound of callee's terminal plays or video image (this sound/image be that the broadcast of the media file that set in advance by the calling subscriber produces); This is called color image service.Color image service is provided with by the calling subscriber, shows to callee user.Color image service can be play corresponding polychrome file to the called subscriber according to the prior preset condition of user.For example, can play different polychrome files according to called subscriber's difference, the different polychrome file of playing in the different time periods.

In order to satisfy the needs of multimedia communication, 3GPP has introduced IP Multimedia System (IMS on the basis of original packet carrying network, IP Multimedia Subsystem), IMS can not only provide traditional voice service to the user, also can provide abundant multimedia to experience to the user.Fig. 1 has described the basic framework of IMS network.

The main network element of IMS comprises: controlling call entity (CSCF, Call SessionControl Function), home subscriber server (HSS, Home Subscriber Server), application server (AS, Application Server).

CSCF divides three types: S-CSCF (Serving-Call Session ControlFunction, serving CSCF), I-CSCF (Interrogating CSCF, inquiry CSCF), P-CSCF (Prxy-Call Session Control Function, proxy CSCF).P-CSCF can be in the Access Network of the current location of user, insert first contact network element of IMS network as the user, user's SIP call signaling is forwarded to the IMS core net (signaling protocol of controlling as calling with the SIP signaling in the IMS network, SIP is Session InitiationProtocol, initial session protocol).I-CSCF can finish the function of network internal Information hiding, network enabled safety.S-CSCF finishes basic CCF as the controlling call entity of core, and the interface with application server is provided.

Application server provides professional to the user, has a plurality of application servers in the network, and different business is provided respectively.Relate to three kinds of AS:PSS AS (PSTN/ISDN Simulation Service, PSTN/ISDN artificial service), CRBT AS, polychrome AS among the present invention.PSS AS provides the basic service and the supplementary service of traditional PSTN/isdn network to IMS user, as call blocking, Call Forwarding, Call Waiting etc.CRBT AS provide customized ring back tone to the user.Polychrome AS provides the polychrome of expression caller feature to the user.

HSS writes down each IMS user's user profile and business datum, cooperates CSCF to finish routing function, and authentication, authorization function are provided.User contracting data is kept at HSS, and is downloaded to S-CSCF when the user registers.Preserved the address information of user's service trigger criteria with the AS that business is provided in the user contracting data.When a plurality of business of user are provided by a plurality of AS respectively, have a plurality of AS address informations in the user contracting data.

The user is when application is professional, need increase corresponding CAMEL-Subscription-Information among the HSS under the user, emphasis is a professional pairing initial filter criteria (IFC) in the CAMEL-Subscription-Information, has comprised the address of certain professional trigger condition and service server/application server that business is provided among the IFC.Each PUI (Public User Id, public user identity) can corresponding several IFC.S-CSCF must check corresponding IFC according to PUI, and call request is forwarded to certain application server receiving that initial call asks.

PSI (Public Service Identities, public service identity), it is the same with PUI, all is the form of SIP URI, i.e. the form of Sip:username@domain_name.But PSI is mainly used in identification service and group data.AS can carry out the corresponding service logic according to PSI.PSI is configurable in subscription data.PSI also can be used to carry out addressing for IMS message.

Media Stream in the IMS network and signaling flow all carry by Packet Based Network.Media Stream not only comprises voice, also can comprise data, image, video, other acoustic medium etc.(be also referred to as: media characteristic is described for call control information and media characteristic information, the participant of allow calling out uses this information to remove to set up media channel and transmits Content of Communication, as the sound of proper communication, ring back tone, CRBT, polychrome etc.) all pass through the transmission of SIP signaling.Use SDP (Session Description Protocol, Session Description Protocol) to describe media characteristic information in the SIP signaling.Media characteristic information comprises type (audio frequency, video, image etc.), media coding type, host-host protocol, transmit port, sample rate of communication medium etc.

Though the IMS network has the ability to provide multimedia service to the user, but traditional basic service and supplementary service (being provided by PSS AS) do not comprise multimedia service, PSS AS provide routine ring back tone to the calling party, provide the number (if caller permission) of caller to the callee, thereby can not make full use of the multimedia capabilities of IMS network.

In view of this, the invention provides for example a kind of implementation method of Ring Back Tone service and color image service of multimedia service, make the user can enjoy Ring Back Tone service and color image service, these two kinds of business are provided by CRBT AS and polychrome AS respectively.

Existing Ring Back Tone service and color image service flow process based on the IMS network can be described as unification pattern and clastotype.

Under the unification pattern, PSS AS and CRBT AS or polychrome AS unification, an independent AS can provide PSS business, Ring Back Tone service and color image service.

Fig. 2 is the Ring Back Tone service flow process (the color image service flow process under the unification pattern is similar with it) under the unification pattern after simplifying, and the PSS AS among the figure not only provides the PSS business, and Ring Back Tone service also is provided.Among the figure, user A is caller, and user B is called.Because P-CSCF just transmits signaling.So the P-CSCF of user A and the local Access Network of A is drawn in the frame, the P-CSCF of user B and the local Access Network of B is drawn in the frame.

The flow process of Fig. 2 is described below:

Step S201: user A initiates an initial call request, and this call request is forwarded to S-CSCF by P-CSCF.

Step S202:S-CSCF downloads to local CAMEL-Subscription-Information according to when registration from HSS, and call request is forwarded to PSS AS.After PSS AS receives call request,, do after certain Business Processing S-CSCF to be beamed back in call request again according to the interior business logic.

Step S203:S-CSCF searches out the route of called B, and call request is transmitted to the P-CSCF of called place Access Network, and P-CSCF is transmitted to called B again.The terminal of user B is received call request, will produce ring response (or calling procedure indication response), and beam back S-CSCF.

The path that step S204:S-CSCF sets up when being forwarded to PSS AS last time is transmitted to PSS AS to the ring response.

Step S205:PSS AS retrieval user subscription data finds that called B has disposed Ring Back Tone service, then connects with media server (server of playback and multimedia resource is provided), and the media characteristic that obtains the CRBT sound is described.

Step S206:PSS AS responds ring (wherein having been added the media characteristic description of CRBT sound by PSS AS) and goes back to S-CSCF.

Step S207:S-CSCF responds ring, by P-CSCF, is given to calling subscriber A.

Step S208: calling subscriber A describes with the media characteristic in the ring response, and sets up a media channel on the IP between media server, and this moment, media server was put the CRBT sound to user A.

Under the disjunctive model, PSS AS, CRBT AS, polychrome AS are independent AS, the user can dispose supplementary service, Ring Back Tone service and color image service when signatory, and respectively mix the corresponding application server address, S-CSCF can be forwarded to PSS AS, CRBT AS or polychrome AS to call request respectively according to the order of sequence according to user signing contract information after receiving the initial call request, after a plurality of AS had returned response, S-CSCF arrived the called subscriber to call forward.The called subscriber can return ring response (or calling procedure indication response), and this ring response arrives after the S-CSCF, also as the initial call request, is forwarded to PSS AS, CRBT AS or polychrome AS according to the order of sequence respectively, and a plurality of AS still can return the ring response.Afterwards, S-CSCF is forwarded to calling subscriber A to ring response, and then, caller can be heard the CRBT sound, calledly can see polychrome.

Fig. 3 is the Ring Back Tone service flow process (the color image service flow process under the clastotype is similar with it) under the clastotype after simplifying, and the PSS AS among the figure only provides the PSS business.Independent CRBT AS is arranged in the network, Ring Back Tone service is provided.Among the figure, user A is caller, and user B is called.Because P-CSCF just transmits signaling.So the P-CSCF of user A and the local Access Network of A is drawn in the frame, the P-CSCF of user B and the local Access Network of B is drawn in the frame.

Under this pattern, the user had both disposed the address information of PSS AS in subscription data, had also disposed the address information of CRBT AS.

The flow process of Fig. 3 is described below:

Step S301: user A initiates an initial call request, and this call request is forwarded to S-CSCF by P-CSCF.

Step S302:S-CSCF downloads to local CAMEL-Subscription-Information according to when registration from HSS, earlier call request is forwarded to PSS AS.After PSS AS receives call request,, do after certain Business Processing S-CSCF to be beamed back in call request again according to the interior business logic.

Step S303:S-CSCF continues to check CAMEL-Subscription-Information, finds to also have a CRBT AS, just CRBT AS is given in call request, and CRBT AS does after professional the processing S-CSCF to be beamed back in call request again.

Step S304:S-CSCF searches out the route of called B, and call request is transmitted to the P-CSCF of called place Access Network, and P-CSCF is transmitted to called B again.The terminal of user B is received call request, will produce the ring response, and beam back S-CSCF.

Step S305:S-CSCF when checking CAMEL-Subscription-Information with a plurality of AS between the path set up, ring responded is transmitted to CRBT AS.CRBT AS describes to the media characteristic that media server is obtained the CRBT sound.Ring being responded (wherein having been added the media characteristic description of CRBT sound by CRBT AS) goes back to S-CSCF.

Step S306:S-CSCF is given to PSS AS to this ring response, after PSS AS handles the business of oneself, the ring response is gone back to S-CSCF again.

Step S307:S-CSCF responds ring, by P-CSCF, is given to calling subscriber A.

Step S308: calling subscriber A describes with the media characteristic in the ring response, and sets up a media channel on the IP between media server, and this moment, media server was put the CRBT sound to user A.

By above flow process as can be seen:

Under the unification pattern, professional autgmentability is relatively poor, and basic supplementary service AS need merge the logic of CRBT AS and polychrome AS, logic control complexity.The trend of network development is the miscellaneous service independent development, and the unification pattern does not meet network development trend.

Under the clastotype, basic supplementary service separates with CRBT and color image AS, makes that professional autgmentability is better, and business network is disposed more flexible.The logic control of basic supplementary service AS becomes simple.The network capacity extension is convenient.But under the clastotype, after call setup was finished, CRBT AS and polychrome AS still were among the call path, participate in whole calling procedure, and the signaling that produces in the communication process still can be passed through CRBT AS and polychrome AS, had taken the ample resources of CRBT AS and polychrome AS.

The target of Ring Back Tone service and color image service is to be used in call establishment stage, provides colourful ring-back tone to the calling subscriber, to the image information of called subscriber's display of calling appointment.The user up to end of calling, no longer needs Ring Back Tone service and color image service behind call setup.Therefore the scheme of clastotype has been wasted the ample resources of CRBT AS and polychrome AS, is unfavorable for the deployment of jumbo commercial network.

Summary of the invention

The present invention aims to provide a kind of new multimedia service implementation, to solve the problem of the wasting of resources in the existing multimedia service scheme.

The invention provides a kind of multimedia service implementation method of IP Multimedia System, may further comprise the steps: when caller makes a call during process to called, PSS AS makes a call to multimedia AS; Multimedia AS caller or called enter talking state before play multimedia; And when caller or called when entering talking state, PSS AS requires multimedia AS to stop play multimedia.

In above-mentioned multimedia service implementation method, caller and called user when signatory, only signatory PSS AS.

In above-mentioned multimedia service implementation method, PSS AS is that every kind of multimedia AS disposes an independent PSI, specifies the routing iinformation of multimedia AS in the information of PSI, is used for S-CSCF when receiving that target is the calling of PSI, according to the information among the PSI, calling is forwarded to multimedia AS.

In above-mentioned multimedia service implementation method, configuration caller and called user's multimedia service attribute among the PSS AS, the multimedia service attribute is when the user registers, PSSAS downloads from HSS and obtains, or on PSS AS local static configuration.

In above-mentioned multimedia service implementation method, PSS AS makes a call to multimedia AS and may further comprise the steps: when called when receiving the initial call request and returning the calling procedure Indication message, PSS AS judges called or caller has been contracted multimedia service, call out multimedia AS by S-CSCF, require multimedia AS to caller or called play multimedia.

In above-mentioned multimedia service implementation method, PSS AS uses the call request message of band PSI, makes S-CSCF can call out multimedia AS.

In above-mentioned multimedia service implementation method, when caller or called when entering talking state, PSS AS requirement multimedia AS stops play multimedia and may further comprise the steps: PSS AS is after receiving by the machine offhook message, be initiated to the cancellation call command of multimedia AS, and the linking of release and multimedia AS, stop and multimedia AS between calling.

In above-mentioned multimedia service implementation method, the request row of cancellation call command is PSI.

In above-mentioned multimedia service implementation method, multimedia service comprises following at least a: Ring Back Tone service, color image service, multimedia AS comprise corresponding CRBT AS and polychrome AS.

By technique scheme, the present invention has realized following technique effect:

Ring Back Tone service and color image service flow process that the present invention realizes, the service server that is beneficial to extensive IMS commercial network is disposed, and can save the multimedia resource of server of color ring back tone service and server of color ring back tone service to greatest extent.

Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 shows the basic framework according to the IMS network of prior art;

Fig. 2 shows according to the Ring Back Tone service flow process under the unification pattern of prior art;

Fig. 3 shows according to the Ring Back Tone service flow process under the clastotype of prior art;

Fig. 4 shows the Ring Back Tone service flow process of a preferred embodiment of the invention;

Fig. 5 shows the color image service flow process of a preferred embodiment of the invention; And

Fig. 6 shows the flow chart according to the multimedia service implementation method of the embodiment of the invention.

Embodiment

Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.In the following description, will illustrate multimedia service, but obviously, the scheme that describes below can also be applied in other multimedia services, and this can not break away from spiritual scope of the present invention with Ring Back Tone service and color image service.

Fig. 6 shows the flow chart according to the multimedia service implementation method of the embodiment of the invention, may further comprise the steps:

Step S10, when caller makes a call during process to called, PSS AS makes a call to multimedia AS;

Step S20, multimedia AS caller or called enter talking state before play multimedia; And

Step S30, when caller or called when entering talking state, PSS AS requires multimedia AS to stop play multimedia.

By scheme provided by the invention, CRBT AS/ polychrome AS only is used for playback stage and call establishment stage, behind called off-hook, no longer participates in follow-up calling procedure, therefore, does not need to take the resource of CRBT AS and polychrome AS after conversation.

Alternatively, CRBT AS/ polychrome AS can be used by a plurality of PSS AS, a plurality of S-CSCF; Therefore, dispose flexibly, dilatation is convenient, professional favorable expandability.

Need to dispose the PSI of CRBT AS/ polychrome AS among the PSS AS.If there are a plurality of CRBT AS/ polychrome AS in the network, different user may belong to different CRBT AS/ polychrome AS, and the CRBT AS/ polychrome AS that then disposes among the PSS AS has a plurality of.

When receiving call request, can return the calling procedure Indication message when called.After this message of PSS AS, can be initiated to the new call request of CRBT AS or polychrome AS.In the signaling of this new call request, request row (being the targeted customer of this request) is a PSI (it has identified the address information of CRBT AS or polychrome AS), and S-CSCF is routed to CRBT AS to this new call request according to PSI.

PSS AS can be initiated to the cancellation call command of CRBT AS or polychrome AS after receiving by the machine offhook message.Request row in this message also is the PSI of CRBT AS or polychrome AS.

The above-mentioned scheme of the present invention can be called two patterns of exhaling.Two exhaling in the pattern in that the present invention proposes do not need the user to dispose CRBT or color image service attribute in subscription data, do not need S-CSCF according to signatory rule request to be triggered (route) to CRBT AS or polychrome AS when receiving the initial call request.But need the Ring Back Tone service attribute or the color image service attribute of configure user among the PSS AS, these information may be when the user registers, and PSS AS downloads from HSS and obtains, and also may be local static configuration on the PSS AS.

Further, the present invention has defined three kinds of AS:PSS AS, CRBT AS and the polychrome AS in the IMS network.Wherein, PSS AS provides the basic service and the supplementary service of traditional PSTN/isdn network, follows the professional use habit of getting off to satisfy the user from legacy network.CRBT AS provides the sound/image of called custom-made to the calling subscriber, as the replacement of ring-back tone.Polychrome AS provides calling customized sound/image to the called subscriber, as the replacement of ring back tone.

Situation when further, only having described CRBT AS and polychrome AS in the flow process among the present invention and respectively have one to appear at operation flow.When the caller color image service of having contracted, and during called signatory Ring Back Tone service, has only the participation of PSS AS and polychrome AS in the operation flow.When the called Ring Back Tone service of having contracted, and during the signatory color image service of caller, has only the participation of PSS AS and CRBT AS in the operation flow.But the caller of the color image service of having contracted also can be called out the called of Ring Back Tone service of having contracted, and at this moment, the fellowship of PSS AS, polychrome AS, CRBT AS is arranged in the operation flow.

Further, by two flow processs of exhaling, the independent deployment of PSS AS, CRBT AS, polychrome AS is beneficial to service billing.After CRBT AS, polychrome AS break down, do not influence the user and use basic supplementary service to finish basic call.

Ring Back Tone service flow process, color image service flow process that this programme proposes are called as two patterns of exhaling." two exhaling " is meant: in the calling procedure, except caller A to the calling that called B initiates, PSS AS can initiate once newly to call out to CRBT AS/ polychrome AS.When caller or called subscriber entered talking state, PSS AS can require CRBT AS/ polychrome AS to stop play multimedia, and the linking of release and CRBT AS/ polychrome AS, stop and CRBT AS/ polychrome AS between calling.

When the called subscriber received the initial call request and returns the calling procedure Indication message, PSS AS judged called subscriber's Ring Back Tone service of having contracted, and calls out CRBT AS by S-CSCF, and CRBT AS is put the CRBT sound to caller.When called subscriber's off-hook, PSS AS can be discharged into the calling of CRBT AS, the calling and called normal talking.

When PSS AS receives the called calling procedure Indication message that returns, judge calling subscriber's color image service of having contracted, call out polychrome AS by S-CSCF, polychrome AS is put polychrome to the called subscriber.When called subscriber's off-hook, PSS AS can be discharged into the calling of polychrome AS, the calling and called normal talking.

The user is when signatory, and only signatory PSS AS is responsible for triggering CRBT/polychrome function by PSS AS.For CRBT AS, polychrome AS respectively dispose an independent PSI, can specify the routing iinformation of CRBT AS or polychrome AS in the information of this PSI, when receiving that target is the calling of PSI,, calling is forwarded to CRBT AS or polychrome AS for S-CSCF according to the information among the PSI.

Below in conjunction with Fig. 4 and Fig. 5 Ring Back Tone service flow process and the color image service flow process that realizes according to a preferred embodiment of the invention described.

Fig. 4 is two to exhale the Ring Back Tone service flow process under the pattern to be described below: (omitted calling terminal in the normal talking and the exchange of media process between terminal called, and with the two process simplifications that trigger between S-CSCF and the PSSAS be single triggering.Two triggerings refer to that S-CSCF is the once corresponding signatory rule of each inspection of calling and called user, and call request respectively is forwarded to caller AS and called AS)

Step S401: the user A request of making a call, P-CSCF is forwarded to call request the S-CSCF of core net.

Step S402-3:S-CSCF arrives PSS AS to call request triggers (promptly transmitting) according to the signatory rule of user A.

PSS AS handles the call request of receiving, sets up user's call state, and call request is gone back to S-CSCF.

Step S404-5:S-CSCF is transmitted to targeted customer B to call request

User B returns calling procedure indication response (183 responses of SIP) and gives S-CSCF.

Step S406:S-CSCF is transmitted to PSS AS to calling procedure indication response.

Step S407:PSS AS checks user's service attribute, finds that the user has Ring Back Tone service, just generates a new call request, and the targeted customer of signaling (representing with PSI) is CRBT AS.This call request is sent to S-CSCF earlier.(annotate: this is two peculiar flow processs in the pattern of exhaling)

Step S408-9:S-CSCF is given to CRBT AS to this new call request according to the PSI in the call request.

CRBT AS generates calling procedure indication response, issues S-CSCF, has wherein carried the media description of CRBT.

Step S410-11:S-CSCF indicates calling procedure, issues PSS AS.

PSS AS goes back to the calling procedure indication to S-CSCF.

Step S412-13:S-CSCF issues calling subscriber A to the calling procedure indication, and A obtains the media description of CRBT medium.

User A returns reliable affirmation (the PRACK order of SIP) and gives S-CSCF.

Step S414-15:S-CSCF is transmitted to PSS AS to reliable affirmation.

PSS AS returns reliable affirmation.

Step S416-17:S-CSCF confirms to issue CRBT AS reliable, and CRBT AS returns success response.

Step S418-19:S-CSCF issues PSS AS to success response, and PSS returns success response.

Step S420-21:S-CSCF confirms to issue called subscriber B reliable, and B returns success response.

Step S422-23:S-CSCF issues PSSAS to success response (No. 200 responses of SIP), and PSS returns success response.

Step S424:S-CSCF issues calling subscriber A to success response.

Step S425: called subscriber B returns ring response (No. 180 responses of SIP), represents called positive ring.

Step S426-27:S-CSCF issues PSS AS to the ring response, after PSS carries out Business Processing, returns the ring response.

Step S428-31:PSS AS photos and sending messages notification message (the Info order of SIP signaling) is given S-CSCF, and the target of this message is CRBT AS.

S-CSCF issues caller A to the ring response, the information notification message is issued CRBT AS, and receive the success response that CRBT AS returns.

Step S432: CRBT AS is to the caller coloring ring back tone playing.

Step S433: called subscriber B off-hook, send out success response and give S-CSCF.

Step S434-39:S-CSCF issues PSS AS to success response, and PSS returns success response, and this success response is transmitted to caller A by S-CSCF.Because this moment, CRBT AS should stop to put the CRBT sound, then PSS AS sends out mandatum cassatorium (the Cancel message of SIP) and gives S-CSCF, and target is CRBT AS.S-CSCF issues CRBT AS to mandatum cassatorium, and CRBT AS should discharge medium, stops playback, and returns success response and give S-CSCF.(annotate: this is two peculiar flow processs in the pattern of exhaling)

Step S440-43: CRBT AS returns and please ask termination response (No. 487 responses of SIP) to give PSS AS, and this response is transmitted by S-CSCF.PSS returns acknowledge message (the ACK order of SIP) and gives CRBT AS, still transmits by S-CSCF.

Step S444: enter the normal talking state this moment.Call establishment stage finishes.

Fig. 5 is two color image service flow processs of exhaling under the pattern, is described below: (omitted calling terminal in the normal talking and the exchange of media process between terminal called, and with the two process simplifications that trigger between S-CSCF and the PSS AS be the list triggering.Two triggerings refer to that S-CSCF is the once corresponding signatory rule of each inspection of calling and called user, and call request respectively is forwarded to caller AS and called AS)

Step S501: the user A request of making a call, P-CSCF is forwarded to call request the S-CSCF of core net.

Step S502-3:S-CSCF arrives PSS AS to call request triggers (promptly transmitting) according to the signatory rule of user A.

PSS AS handles the call request of receiving, sets up user's call state, and call request is gone back to S-CSCF.

Step S504-5:S-CSCF is transmitted to targeted customer B to call request

User B returns calling procedure indication response and gives S-CSCF.

Step S506-7:S-CSCF is transmitted to PSS AS to calling procedure indication response.

PSS AS checks user's service attribute, finds that the user has color image service, and the recording user state goes back to the calling procedure indication to S-CSCF.

Step S508-9:S-CSCF is transmitted to caller A to the calling procedure indication, and user A returns reliable acknowledge message.

Step S510: reliable acknowledge message is transmitted to PSS AS by S-CSCF.

Step S511:PSS finds that the user has color image service, just generates a new call request, and targeted customer's (representing with PSI) is polychrome AS.This call request is sent to S-CSCF earlier.(annotate: this is two peculiar flow processs in the pattern of exhaling)

Step S512-13:S-CSCF is given to polychrome AS to this new call request according to the PSI in the call request.

Polychrome AS generates calling procedure indication response, issues S-CSCF, has wherein carried the media description of polychrome.

Step S514-15:S-CSCF indicates calling procedure, issues PSS AS.

PSS AS returns reliable affirmation (wherein wounded picture media description) and gives S-CSCF.

Step S516-17:S-CSCF confirms that reliable (wherein wounded picture media description) give called subscriber B, calledly returns success response.

Step S518-20:S-CSCF issues PSS AS to success response, after PSS AS manages business, returns success response and gives PSS AS.

S-CSCF is transmitted to caller A to success response.

Step S521: called subscriber B returns ring and responds to S-CSCF.

Step S522-27:S-CSCF issues PSS AS to the ring response, and PSS AS returns the ring response, and S-CSCF is given to caller A to the ring response again.

After PSS AS receives the ring response, generate an information notification message and give polychrome AS (transmitting) by S-CSCF, AS begins to play polychrome with the notice polychrome.Polychrome AS returns success response.

Step S528: polychrome AS is put polychrome to called B.

Step S529: called subscriber B off-hook, send out success response and give S-CSCF.

Step S530-35: success response is issued PSS AS by S-CSCF earlier, and PSS AS recording user call state is issued S-CSCF to success response, sends out mandatum cassatorium simultaneously and gives S-CSCF, and target is polychrome AS, and AS stops to play polychrome with the notice polychrome.

S-CSCF is given to caller A to success response.

S-CSCF is given to polychrome AS to mandatum cassatorium, after polychrome AS receives orders, returns success response.And the operation that begins to stop to play polychrome.(annotate: this is two peculiar flow processs in the pattern of exhaling)

Step S536-29: polychrome AS sends out request and stops response to PSS AS (transmitting by S-CSCF), and PSS AS returns acknowledge message (being transmitted to polychrome AS by S-CSCF).

Step S540: this moment, call establishment stage was finished, and entered talking state.

As can be seen from the above description, Ring Back Tone service and color image service flow process that the present invention realizes, the service server that is beneficial to extensive IMS commercial network is disposed, and can save the sound resource of CRBT and the image resource of polychrome to greatest extent.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. the multimedia service implementation method of an IP Multimedia System is characterized in that, may further comprise the steps:

When caller makes a call during process to called, the PSS application server makes a call to the multimedia application server;

The multimedia application server caller or called enter talking state before play multimedia; And

When caller or called when entering talking state, the PSS application server requires the multimedia application server to stop play multimedia.

2. multimedia service implementation method according to claim 1 is characterized in that, caller and called user when signatory, only signatory PSS application server.

3. multimedia service implementation method according to claim 2, it is characterized in that, described PSS application server is that every kind of multimedia application server disposes an independent public service identity, specify the routing iinformation of multimedia application server in the information of described public service identity, be used for the service call controlled entity when receiving that target is the calling of public service identity, according to the information in the public service identity, calling is forwarded to described multimedia application server.

4. multimedia service implementation method according to claim 1, it is characterized in that, configuration caller and called user's multimedia service attribute in the PSS application server, described multimedia service attribute is when the user registers, the PSS application server downloads from HSS and obtains, or on the PSS application server local static configuration.

5. multimedia service implementation method according to claim 3 is characterized in that, the PSS application server makes a call to the multimedia application server and may further comprise the steps:

When called when receiving the initial call request and returning the calling procedure Indication message, the PSS application server is judged called or caller has been contracted multimedia service, call out the multimedia application server by the service call controlled entity, require the multimedia application server to caller or called play multimedia.

6. multimedia service implementation method according to claim 5 is characterized in that, the PSS application server uses the call request message with described public service identity, makes the service call controlled entity can call out the multimedia application server.

7. multimedia service implementation method according to claim 3 is characterized in that, when caller or called when entering talking state, the PSS application server requires the multimedia application server to stop play multimedia may further comprise the steps:

The PSS application server is initiated to the cancellation call command of multimedia application server after receiving by the machine offhook message, and the linking of release and multimedia application server, stop and the multimedia application server between calling.

8. multimedia service implementation method according to claim 7 is characterized in that, the request row of described cancellation call command is described public service identity.

9. according to each described multimedia service implementation method in the claim 1 to 8, it is characterized in that, described multimedia service comprises following at least a: Ring Back Tone service, color image service, described multimedia application server comprise corresponding CRBT application server and polychrome application server.

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