CN101282574A

CN101282574A - Communication system, equipment and multimedia calling method

Info

Publication number: CN101282574A
Application number: CNA2007100937067A
Authority: CN
Inventors: 郭晓龙
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-04-05
Filing date: 2007-04-05
Publication date: 2008-10-08
Also published as: WO2008122228A1

Abstract

The invention discloses a communication system, a communication device and a multimedia calling method. The communication system comprises service switching points, a first substance and a second substance. The service switching points are separately started to two sections multimedia calling based on calling and called terminals of USSD call back. The first substance comprises a calling multimedia negotiation unit used for responding to the calling on the calling terminal and then completing multimedia negotiation with the calling terminal to gain a first negotiation result. The second substance comprises a multimedia negotiation device used for responding to the calling on the called terminal and then completing the multimedia negotiation with the called terminal according to the first negotiation result to gain a second negotiation result. The invention can realize multimedia services under UCB calling.

Description

Communication system, equipment and multimedia calling method

Technical field

The present invention relates to the communications field, particularly relate to a kind of communication system, equipment and multimedia calling method.

Background technology

Present 3G (Third Generation) Moblie (3G, Third Generation Mobile Communication) multimedia service requires the calling and called terminal to carry out multimedia negotiation when call answering, calling both sides just can be conversed after consulting successfully, mobile services switching centre/Visited Location Registor/Service Switching Point (MSC/VLR/SSP, Mobile Service Switching Center/Visit Location Register/Service Switch Point) is responsible for the foundation of bearer path in this process.

Multimedia negotiation between the general multimedia service calling and called terminal (H.324 multiplex stream) in band is finished, promptly directly hold consultation by the calling and called terminal, MSC/VLR/SSP just is responsible for the foundation of bearer path in this process, do not participate in negotiations process.(LC: logical channel) H.245 carrying controls signaling to LC0 in the described H.324 multiplex stream, and other logical channels then are used to transmit the Media Stream that comprises Voice ﹠ Video.H.245 signaling is used for finishing the interactive terminal capability set and opening process such as Media Stream logical channel at negotiation phase.Consult Fig. 1, described multimedia service calling flow process specifically comprises:

Step 101: caller makes a call;

Step 102: the caller MSC/VLR of Calling Side obtains called MSRN from attaching position register (HLR, HomeLocation Register), and routing call is to the called MS C/VLR of callee side then;

Step 103: carry out terminal capabilities set (TCS behind the call answering between calling terminal UEa and the terminal called, Terminal Capability Set), the principal and subordinate determines (MSD, Master Slave Determination), local multi-meter sends (LMS, Local Muxtable Send) and open logical channel negotiations processes such as (OLC, OpenLogic Channel):

1) TCS process: obtain the various H.245 abilities of middle definition in opposite end, comprise multiplexing capacity, receive the ability of the various code/decode type medium of transmission etc., so that when opening logical channel, select suitable encoding and decoding, multiplexing parameters etc.;

2) MSD process: determine that an end is Master, an end is Slave.When clashing in the calling procedure, be as the criterion, selected different encoding and decoding then to be as the criterion with the selection of Master such as Master when opening logical channel and Slave with the selection of Master;

3) LMS process: send local multi-meter;

4) OLC process: the logical channel of opening Media Stream.

Step 104: both sides begin conversation after consulting to finish

For special multimedia service, such as prepayment service (PPS, Prepaid Paid Services) user, user profile is to leave on the home service control point (SCP, Service Control Point).When international roaming takes place in PPS user, because the on-site network of roaming is not connected with the intelligent network that belongs to state's network or can't be mutual, therefore can't directly trigger international roaming PPS user's intelligent dialing flow process in the roaming place, cause international roaming PPS user to make a call.Propose to replenish (adding) business datum (USSD based on destructuring for this reason, Unstructured Supplementary Service Data) callback (UCB, USSD Call Back) scheme, this scheme are only required the network support USSD function in roaming country/area.

Fig. 2 is the flow chart that prior art UCB calls out, for convenience, hereinafter all schemes that relate to are that example describes with the UCB that the CAMEL4 agreement realizes all, A is the international roaming PPS user who makes a call in the related procedure, B is the domestic consumer of call accepted, and MSC/VLR/SSP is MSC Server+MGW under the carrying of 3GPP R4 and framework that control separates.Described UCB call flow is as follows:

Step 201: caller initiates to carry the USSD request of specific USSD sign indicating number and called number, and this request arrives the caller HLR of caller ownership through international gateway;

Step 202: caller HLR transmits the USSD carry numbers of calling and called parties and asks service control point (SCP, Service Control Point) to USSD center-caller ownership;

Step 203: caller SCP triggers the UCB flow process according to the USSD sign indicating number, and the Service Switching Point (SSP, Service Switch Point) of handling UCB is given in the indication that issues the caller that continues;

Step 204: calling SSP starts the calling network to caller, reports to caller SCP behind the call answering and replys indication;

Step 205: caller SCP issues and gives calling SSP to the calling audio playback and the called indication that continues;

Step 206: calling SSP is play " it is called to continue, and please wait a moment " similarly prompt tone to caller, starts simultaneously called calling network, reports to caller SCP behind the call answering and replys indication;

Here the calling of finishing caller connects.

Step 207: caller SCP issues and stops to give calling SSP to calling audio playback and connection caller and called indication, and calling SSP stops playback, and connects caller and two sections called callings, and caller and called the beginning are conversed.

Here finish called calling is connected, and at network side above-mentioned caller is connected with called calling and carries out bridge joint, finish caller and called call path.

As mentioned above, call out for UCB, SSP need be established to the calling network of calling and called respectively, carries out bridge joint after two sections callings are all replied again, connects calling and called.UCB calls out does not have specific (special) requirements to speech business, but if the support multimedia service then needs SSP to realize and the multimedia negotiation of portable terminal that this is not also having feasible scheme at present.

Summary of the invention

The technical problem that embodiment of the present invention will solve is to provide a kind of UCB to call out communication system, communication equipment and the multimedia calling method of realizing multimedia service down respectively.

For solving above-mentioned first technical problem, the invention provides a kind of communication system execution mode, comprise Service Switching Point, first entity and second entity, described Service Switching Point starts to two sections multimedia calls based on the caller of USSD callback and terminal called respectively, described first entity comprises caller multimedia negotiation unit, be used for after described calling terminal is to above-mentioned call answering finishing multimedia negotiation and obtain first negotiation result with it, described second entity comprises called multimedia negotiation device, be used for after described terminal called is to above-mentioned call answering, finish multimedia negotiation and obtain second negotiation result according to described first negotiation result and terminal called.

For solving above-mentioned second technical problem, the invention provides a kind of communication equipment, comprise call answering receiving element and multimedia negotiation unit, described call answering receiving element is used to receive the call answering based on the USSD callback; Described multimedia negotiation unit is used for describedly finishing multimedia negotiation with answer party after based on the call answering of USSD callback receiving.

For solving above-mentioned the 3rd technical problem, the invention provides a kind of multimedia calling method execution mode, comprising: the callback based on USSD that starts to caller is called out; After described caller is replied, carry out the multimedia negotiation first time with described caller; Starting to the called callback based on USSD calls out; Behind described called party answer, according to the result and the described called multimedia negotiation second time of carrying out of described first time of multimedia negotiation; After consulting successfully, connect caller and callee's calling.

More than first technical scheme as can be seen, since caller and terminal called respectively UCB is called out reply after, adopt calling and called multimedia negotiation unit to finish multimedia negotiation with calling terminal and terminal called respectively, promptly between two sections callings of calling and called that UCB calls out, set up network agent, finish multimedia negotiation with caller and terminal called, relatively prior art is called out the technological deficiency that can't support multimedia service under the sight at UCB, the function of the multimedia service that the present invention obviously can realize supporting that UCB calls out.

More than second technical scheme as can be seen, owing to adopt the call answering receiving element to receive replying of UCB calling, trigger multimedia negotiation unit and answer party and finish multimedia negotiation, promptly between two sections callings of calling and called that UCB calls out, set up network agent, finish multimedia negotiation, relatively prior art is called out the technological deficiency that can't support multimedia service under the sight at UCB, the function of the multimedia service that the present invention obviously can realize supporting that UCB calls out.

More than the 3rd technical scheme as can be seen, since caller and terminal called respectively UCB is called out reply after, finish multimedia negotiation with calling terminal and terminal called respectively, promptly between two sections callings of calling and called that UCB calls out, set up network agent, finish multimedia negotiation with caller and terminal called, relatively prior art is called out the technological deficiency that can't support multimedia service under the sight at UCB, the function of the multimedia service that the present invention obviously can realize supporting that UCB calls out.

Description of drawings

Fig. 1 is the call flow diagram of prior art multimedia service;

Fig. 2 is the flow chart that prior art UCB calls out;

Fig. 3 is the flow chart of multimedia calling method first execution mode of the present invention;

Fig. 4 is the flow chart of multimedia calling method second execution mode of the present invention;

Fig. 5 is the flow chart of multimedia calling method the 3rd execution mode of the present invention;

Fig. 6 is the theory diagram of communication equipment second execution mode of the present invention;

Fig. 7 is the theory diagram of communication system second execution mode of the present invention;

Fig. 8 is the theory diagram of communication system the 3rd execution mode of the present invention;

Fig. 9 is the theory diagram of communication equipment the 3rd execution mode of the present invention;

Figure 10 is the theory diagram of communication equipment the 4th execution mode of the present invention.

Embodiment

The invention provides communication system first execution mode, it comprises SSP, first entity and second entity, described SSP starts to two sections multimedia calls based on the caller of USSD callback and terminal called respectively, described first entity comprises caller multimedia negotiation unit, be used for after described calling terminal is to above-mentioned call answering finishing multimedia negotiation and obtain first negotiation result with it, described second entity comprises called multimedia negotiation unit, be used for after described terminal called is to above-mentioned call answering, finish multimedia negotiation and obtain second negotiation result according to described first negotiation result and terminal called.

Below as can be seen, present embodiment caller and terminal called respectively UCB is called out reply after, adopt calling and called multimedia negotiation unit to finish multimedia negotiation with calling terminal and terminal called respectively, promptly between two sections callings of calling and called that UCB calls out, set up network agent, finish the multimedia negotiation with caller and terminal called, can realize the multimedia service of supporting that UCB calls out.

The present invention also provides communication equipment first execution mode, and it comprises call answering receiving element and multimedia negotiation unit, and described call answering receiving element is used to receive the call answering based on the USSD callback; Described multimedia negotiation unit is used for describedly finishing multimedia negotiation with answer party after based on the call answering of USSD callback receiving.

In like manner, the present embodiment communication equipment adopts multimedia negotiation unit and answer party to finish multimedia negotiation, can realize the multimedia service of supporting that UCB calls out.

The present invention also provides multimedia calling method first execution mode, comprises step:

Steps A: the multimedia call that starts to the UCB caller;

Step B: after this caller is replied, carry out the multimedia negotiation first time with this caller;

Step C: start to the called multimedia call of UCB;

Step D: behind this called party answer, according to the result and this called multimedia negotiation second time of carrying out of this of multimedia negotiation first time;

Step e: after consulting successfully, connect caller and callee's calling.

Below as can be seen, present embodiment increases the multimedia negotiation step respectively behind caller/called party answer in starting to the multimedia call process of UCB caller/called, can realize the multimedia service of supporting that UCB calls out.

Embodiment of the present invention can be applied to the multimedia call of UCB or other need carry out all technology of multimedia negotiation in the UCB business, the entity that wherein carries out multimedia negotiation can be Video Interworking Gateway (VIG, Video Interworking Gateway) or other entities identical or similar functions.The effect of VIG can be simple multimedia negotiation, also can from the H.324 multiplex stream of mutual with it caller/terminal called, go out H.245 to control signaling, audio frequency and video by demultiplexing, and with portable terminal consult this H.245 the signaling encoding and decoding of carrying to finish multimedia negotiation.After the negotiation, H.324 H.245 control signaling, the Voice ﹠ Video that demultiplexing is gone out be multiplexed into again that multiplex stream sends distant terminal to.

Two kinds of selections are arranged: be built among the SSP, or be configured during the VIG concrete configuration as external stand-alone network elements.Embodiment of the present invention divides built-in VIG and two kinds of schemes of external VIG to be described.The formation of SSP includes but not limited to the framework that the carrying of 3GPP R4 separates with control.

Below in conjunction with execution mode and accompanying drawing, describe the present invention.

Consulting Fig. 3, is multimedia calling method second execution mode of the present invention, and this execution mode is the UCB scheme of built-in VIG.In simple terms, VIG is arranged in the SSP.When being applied to the multimedia call of UCB, this multimedia calling method mainly divides two sections processes: when SSP sets up A section calling network, VIG replys the back at calling terminal and carries out multimedia negotiation with it, by SSP calling terminal is play one section audio/video prompting after consulting to finish and is continuing called; When SSP sets up B section calling network and terminal called and replys, VIG carries out multimedia negotiation according to negotiation result and the terminal called that the A section is called out once more, stop to point out the broadcast of audio/video after negotiation is finished by SSP, and finish the bridge joint of two sections callings, connect calling and called.

Particularly, the multimedia calling method handling process of this built-in VIG scheme is as follows:

Step 301: calling terminal initiates to carry the USSD sign indicating number of multimedia service correspondence and the USSD of called terminal number asks, and this request arrives the caller HLR of calling terminal ownership through international gateway.

Step 302: caller HLR transmits the USSD carry the calling and called termination number and asks caller SCP to USSD center-calling terminal ownership.

Step 303: caller SCP triggers the UCB flow process according to the USSD sign indicating number, and the calling SSP of handling UCB is given in the indication that issues the calling terminal that continues.

Step 304: the multimedia call that starts to the UCB caller;

Calling SSP sends IAM message to caller MSC/VLR, starts to the multimedia call of UCB calling terminal.This caller MSC/VLR returns call answered signal ANM to calling SSP, triggers the following multimedia negotiation process first time.

Step 305: after this caller is replied, carry out the multimedia negotiation first time with this caller.

Negotiations processes such as TCS, MSD, LMS and OLC between the VIG in calling terminal initiation and the calling SSP behind the call answering.

The concrete multimedia negotiation process first time is as follows:

1) calling SSP receives the multiplex stream of calling terminal after calling terminal is replied;

2) call the demultiplexing resource and from this multiplex stream, parse the encoding and decoding that calling terminal is supported;

3) VIG in this calling SSP negotiates consistent encoding and decoding with calling terminal, draws negotiation result.

After VIG in the calling SSP and calling terminal are finished negotiation, calling terminal is play one section audio/video prompting continuing called.This audio/video resource can be local resource, also can be provided by the multimedia resource platform of outside.Simultaneously report calling terminal to reply indication to caller SCP; Terminated call when consulting failure.

Step 306: caller SCP issues the indication of switching called terminal and gives calling SSP.

Step 307: calling SSP starts to the multimedia call of UCB terminal called.

Calling SSP sends IAM message to called MS C/VLR, starts to the multimedia call of UCB terminal called.This called MS C/VLR returns call answered signal ANM to calling SSP, triggers the following multimedia negotiation process second time.

Step 308: behind this called party answer, with this called multimedia negotiation second time of carrying out.

Terminal called is initiated the negotiations process of TCS, MSD, LMS and OLC etc. behind the call answering, after negotiation result that calling SSP/VIG calls out according to the A section and terminal called are finished negotiation, and reports to caller SCP and to reply indication; Terminated call when consulting failure.

The concrete multimedia negotiation process second time is as follows:

1) calling SSP receives the multiplex stream of terminal called after terminal called is replied;

2) call the demultiplexing resource and from this multiplex stream, parse the encoding and decoding that terminal called is supported;

3) judge whether calling terminal can negotiate consistent encoding and decoding with terminal called, judge promptly whether the encoding and decoding among above-mentioned first time of the multimedia negotiation result and the encoding and decoding of terminal called support have common factor;

4) when judged result when being, discharge this demultiplexing resource, directly between the calling and called terminal by calling SSP transmission multiplex stream; In judged result for not the time, adopt encoding and decoding conversion resource will convert the consistent demux stream of supporting with terminal called of encoding and decoding to from the demux stream of caller terminal, or will convert the consistent demux stream of supporting with calling terminal of encoding and decoding to from the demux stream of terminal called, and multiplexing should be through demux stream of conversion encoding and decoding so that above-mentioned calling and called terminal can be transmitted caller respectively to data flow called, that be called into calling terminal when connecting.

Wherein, if two sections callings of calling and called and network can be gone up by TrFO (encode/decode-free converter operation) end to end at the various Media Streams (comprising Voice ﹠ Video) of transmission and all be negotiated consistent encoding and decoding, then can discharge this additional demultiplexing resource, directly between the calling and called terminal, transmit multiplex stream by calling SSP, otherwise also need outer TC (encoding and decoding converter) resource of occupying volume, this resource is conciliate multiplexed resource and just can be released when end of calling.

Step 309: caller SCP issues the indication of connecting calling terminal and terminal called and gives calling SSP, and calling SSP stops to point out the broadcast of audio/video, and connects two sections callings of caller and terminal called, and caller and terminal called begin conversation.

More than describe and can know, present embodiment behind caller/called party answer, is finished multimedia negotiation respectively in step 305,308 in step 304,307 in starting to the multimedia call process of UCB caller/called.In step 309, connect the calling and called terminal after finishing multimedia negotiation, can realize the multimedia service of supporting that UCB calls out.

Fig. 4 and Fig. 5 are respectively third and fourth execution modes of multimedia calling method of the present invention, the UCB scheme that this two execution mode is external VIG.In simple terms, VIG is arranged in other network elements except the SSP, realizes same multimedia negotiation function.Wherein, external VIG can be divided into caller VIG and called VIG.When being applied to the multimedia call of UCB, this multimedia calling method still mainly divides two sections processes: when SSP sets up A section calling network, caller VIG replys the back at calling terminal and carries out multimedia negotiation with it, by SSP calling terminal is play one section audio/video prompting after consulting to finish and is continuing called; When SSP set up B section calling network and terminal called and replys, negotiation result and terminal called that called VIG calls out according to the A section carried out multimedia negotiation, are stopped to point out the broadcast of audio/video after negotiation is finished by SSP.Finish the bridge joint of two sections callings at last, connect calling and called.

The carrying whether the UCB scheme of external VIG takies between SSP and the VIG after according to A/B section call through can be subdivided into two kinds of schemes again:

Scheme one: exist carrying to be connected behind the A/B section call through between calling SSP and the VIG;

Scheme two: do not exist carrying to be connected behind the A/B section call through between calling SSP and the VIG.

Below introduce respectively.

Consult Fig. 4, it is multimedia calling method the 3rd execution mode of the present invention, VIG comprises the caller VIG and the called VIG of physical separation in this execution mode, calling and called VIG is positioned at outside the SSP, and exist carrying to be connected between SSP behind A, the B section call through and VIG, specifically the multimedia calling method handling process is as follows:

Step 401: calling terminal initiates to carry the USSD sign indicating number of multimedia service correspondence and the USSD of called terminal number asks, and this request arrives the caller HLR of calling terminal ownership through international gateway.

Step 402: caller HLR transmits the USSD carry the calling and called termination number and asks caller SCP to USSD center-calling terminal ownership.

Step 403: caller SCP triggers the UCB flow process according to the USSD sign indicating number, and the calling SSP of handling UCB is given in the indication that issues the calling terminal that continues.

Step 404: the multimedia call that starts to the UCB caller;

Calling SSP starts the calling network to calling terminal, and the SRI ACK way of escape of receiving caller HLR is by calling out to caller VIG.Wherein, calling SSP employing Session Initiation Protocol and caller VIG are mutual, and in the INVITE that sends to caller VIG, carry SDP information, comprise that encoding and decoding and calling SSP call out in the relevant information of calling SSP bearing resource of distributing between calling SSP and the caller VIG for the A section, such as IP address and udp port number etc.

Caller VIG routing call specifically is that caller VIG sends IAM message to caller MSC/VLR to the caller MSC/VLR at calling terminal place, starts to the multimedia call of UCB calling terminal.This caller MSC/VLR returns call answered signal ANM to caller VIG, triggers the following multimedia negotiation process first time.

Step 405: after this caller is replied, carry out the multimedia negotiation first time with this caller.

Negotiations processes such as TCS, MSD, LMS and OLC behind the call answering between calling terminal initiation and the caller VIG.Terminated call when consulting failure.

The concrete multimedia negotiation process first time is as follows:

1) caller VIG receives the multiplex stream of calling terminal after calling terminal is replied;

3) this caller VIG negotiates consistent encoding and decoding with calling terminal, draws negotiation result.

4) caller VIG and calling terminal send 200 OK INVITE to calling SSP after finishing and consulting.Wherein this 200 OK INVITE carries SDP information, comprises that negotiation result that the A section is called out and caller VIG call out the relevant information of bearing resource at the caller VIG place entity that distributes between caller VIG and the calling SSP for the A section, as IP address and udp port number etc.;

This calling SSP is connected with the carrying of this calling SSP according to setting up caller VIG place entity from the carrying address of this caller VIG place entity, and this carrying connects and is used to play the audio/video prompting.

Step 406: calling SSP is continuing called to one section audio/video prompting of calling terminal broadcast, this audio/video resource can be local resource, also can be provided by the multimedia resource platform of outside.And return ACK message for caller VIG, report to caller SCP simultaneously and reply indication.

Step 407: caller SCP issues the indication of switching called terminal and gives calling SSP.

Step 408: calling SSP starts to the multimedia call of UCB terminal called.

Calling SSP receives that the SRI ACK way of escape of called HLR is by calling out to called VIG.Specifically be that this calling SSP employing Session Initiation Protocol and called VIG are mutual, in sending to the INVITE of called VIG, carry SDP information, comprise that negotiation result that the A section is called out and calling SSP call out in the relevant information of calling SSP bearing resource of distributing between calling SSP and the called VIG for the B section, as IP address and udp port number etc.

Step 409: called VIG routing call is to the called MS C/VLR at terminal called place.

Called VIG sends IAM message to called MS C/VLR, starts to the multimedia call of UCB terminal called.This called MS C/VLR returns call answered signal ANM to called VIG, triggers the following multimedia negotiation process second time.

Step 410: behind this called party answer, with this called multimedia negotiation second time of carrying out.

Terminal called is initiated negotiations processes such as TCS, MSD, LMS and OLC behind the call answering, and called VIG encoding and decoding that call negotiation goes out according to the A section and terminal called are finished negotiation; Terminated call when consulting failure.

The concrete multimedia negotiation process second time is as follows:

1) called VIG receives the multiplex stream of terminal called after terminal called is replied;

4) when judged result when being, multiplexing data flow through demultiplexing is so that following calling and called terminal can be transmitted caller respectively to data flow called, that be called into calling terminal when connecting; In judged result for not the time, adopt encoding and decoding conversion resource will convert the consistent demux stream of supporting with terminal called of encoding and decoding to from the demux stream of caller terminal, or will convert the consistent demux stream of supporting with calling terminal of encoding and decoding to from the demux stream of terminal called, and multiplexing should be through demux stream of conversion encoding and decoding so that following calling and called terminal can be transmitted caller respectively to data flow called, that be called into calling terminal when connecting.

If two sections callings can not be gone up by TrFO end to end at the various Media Streams (comprising Voice ﹠ Video) of transmission and all be negotiated consistent encoding and decoding, then need the outer TC resource of occupying volume, this resource just is released when end of calling.

Called VIG sent 200 OK INVITE to calling SSP after negotiation was finished.This INVITE carries SDP information, comprises that negotiation result that the B section is called out and called VIG call out in the relevant information of called VIG place entity bearing resource of distributing between called VIG and the calling SSP for the B section, as IP address and udp port number etc.

So far, calling SSP has obtained the carrying address of caller VIG and called VIG place entity respectively in above-mentioned steps 405 and this step, has set up the data channel between caller VIG and the called VIG place entity respectively, connects for calling and called and prepares.

Step 411: calling SSP returns ACK message for called VIG, and reports to caller SCP and to reply indication.

Step 412: caller SCP issues the indication of connecting calling terminal and terminal called and gives calling SSP, calling SSP stops to point out the broadcast of audio/video, and, be established to the data channel between caller VIG and the called VIG place entity respectively according to the carrying address of the calling and called VIG place entity that obtains in step 405 and the step 410.Last calling SSP is connected calling terminal and terminal called on this data channel two sections callings, calling terminal and terminal called begin conversation.

Consult Fig. 5, it is multimedia calling method the 4th execution mode of the present invention, VIG comprises the caller VIG and the called VIG of separation in this execution mode, calling and called VIG is positioned at outside the SSP, and do not exist carrying to be connected between SSP behind A, the B section call through and calling and called VIG, specifically the multimedia calling method handling process is as follows:

Step 501: calling terminal initiates to carry the USSD sign indicating number of multimedia service correspondence and the USSD of called terminal number asks, and this request arrives the caller HLR of calling terminal ownership through international gateway.

Step 502: caller HLR transmits the USSD carry the calling and called termination number and asks caller SCP to USSD center-calling terminal ownership.

Step 503: caller SCP triggers the UCB flow process according to the USSD sign indicating number, and the calling SSP of handling UCB is given in the indication that issues the calling terminal that continues.

Step 504: the multimedia call that starts to the UCB caller;

Calling SSP starts the calling network to calling terminal, and the SRI ACK way of escape of receiving caller HLR is by calling out to caller VIG.Wherein, calling SSP employing Session Initiation Protocol and caller VIG are mutual, and in the INVITE that sends to caller VIG, carry SDP information, comprise that encoding and decoding and calling SSP call out in the relevant information of local terminal bearing resource of distributing between calling SSP and the caller VIG for the A section, such as IP address and udp port number etc.

Step 505: after this caller is replied, carry out the multimedia negotiation first time with this caller.

The concrete multimedia negotiation process first time is as follows:

Step 506: calling SSP is continuing called to one section audio/video prompting of calling terminal broadcast, this audio/video resource can be local resource, also can be provided by the multimedia resource platform of outside.And return ACK message for caller VIG, report to caller SCP simultaneously and reply indication.

Step 507: caller SCP issues the indication of switching called terminal and gives calling SSP.

Step 508: calling SSP starts to the multimedia call of UCB terminal called.

Calling SSP receives that the SRI ACK way of escape of called HLR is by calling out to called VIG.Specifically be that this calling SSP employing Session Initiation Protocol and called VIG are mutual, in sending to the INVITE of called VIG, carry SDP information, comprise that negotiation result that the A section is called out and caller VIG call out the relevant information of bearing resource at the caller VIG place entity that distributes between caller VIG and the calling SSP for the A section, as IP address and udp port number etc.

Step 509: called VIG routing call is to the called MS C/VLR at terminal called place.

Step 510: behind this called party answer, with this called multimedia negotiation second time of carrying out.

The concrete multimedia negotiation process second time is as follows:

4) when judged result when being, multiplexing data flow through demultiplexing is so that described calling and called terminal can be transmitted caller respectively to data flow called, that be called into calling terminal when connecting; In judged result for not the time, adopt encoding and decoding conversion resource will convert the consistent demux stream of supporting with terminal called of encoding and decoding to from the demux stream of caller terminal, or will convert the consistent demux stream of supporting with calling terminal of encoding and decoding to from the demux stream of terminal called, and multiplexing should be through demux stream of conversion encoding and decoding so that following calling and called terminal can be transmitted caller respectively to data flow called, that be called into calling terminal when connecting.

Called VIG sent 200 OK INVITE to calling SSP after negotiation was finished.This INVITE carries SDP information, comprises that negotiation result that the B section is called out and called VIG call out the relevant information of bearing resource at the called VIG place entity that distributes between called VIG and the calling SSP for the B section, as IP address and udp port number etc.

Step 511: calling SSP returns ACK message for called VIG, and reports to caller SCP and to reply indication.

Step 512: caller SCP issues the indication of connecting calling terminal and terminal called and gives calling SSP, calling SSP stops the broadcast to the prompting audio/video, the local terminal carrying connection resource that distributes is called out in deletion between calling SSP and caller VIG for the A section, and send to caller VIG and to carry the INVITE of SDP information, described SDP information comprises the negotiation result of called VIG and the carrying address related content of called VIG place entity.Caller VIG receives that the back obtains the beared information of called VIG place entity from this SDP information, directly sets up to be connected with the carrying of called VIG, begins conversation by calling and called VIG between calling terminal and the terminal called.

In another execution mode of external VIG, caller VIG and called VIG are same VIG, and two sections callings can be gone up by TrFO end to end at the various Media Streams (comprising Voice ﹠ Video) of transmission and all be negotiated consistent encoding and decoding, then can be released to the A/B section and call out the demultiplexing resource of distributing separately, directly between the calling and called terminal, transmit multiplex stream by VIG.

Consulting Fig. 6, is the theory diagram of communication equipment second execution mode of the present invention.This communication equipment comprises multimedia negotiation unit 660.In the present embodiment, this communication equipment can be SSP 610.This SSP 610 can also comprise call answering receiving element (figure does not show) and bridge-jointing unit.Described call answering receiving element receives described UCB call answering after starting to two sections multimedia calls of the caller of UCB and terminal called respectively at SSP 610.

This multimedia negotiation unit 660 is built in this SSP 610, is used for finishing multimedia negotiation with it after this calling terminal is to above-mentioned UCB call answering, finishes multimedia negotiation after this terminal called is to above-mentioned UCB call answering with it.Specifically be used for finishing multimedia negotiation and obtaining first negotiation result, adopt this first negotiation result and terminal called to finish multimedia negotiation and obtain second negotiation result, judge whether the calling and called terminal can negotiate consistent encoding and decoding with calling terminal.

This communication system also comprises demultiplexing unit 630, encoding and decoding converter 640, Multiplexing Unit and the multimedia Tip element of integrating with this SSP 610 620.H.245, this demultiplexing unit 630 is used for parsing from the multiplex stream from this caller or terminal called controls signaling, Voice ﹠ Video data flow, and H.245 this is controlled signaling import this multimedia negotiation unit 660.This encoding and decoding converter 640 is used to change the encoding and decoding of audio frequency and/or video data stream.This Multiplexing Unit is used for multiplexing signaling, the Voice ﹠ Video data flow H.245 controlled.This multimedia Tip element 620 is used for finishing calling terminal in this multimedia negotiation unit 660 and consults the audio/video prompting that the back is being continued called to this caller broadcast.

In the real work, when this second negotiation result showed that the calling and called terminal can negotiate consistent encoding and decoding, this multimedia negotiation unit 660 stopped the work of this demultiplexing unit 630, and adopts described bridge-jointing unit to connect this two sections multimedia calls; In the time can not negotiating consistent encoding and decoding, audio frequency and/or video data stream that the demultiplexing of caller or terminal called goes out are imported this encoding and decoding converter 640, this audio frequency and/or video data stream converted to distant terminal encoding and decoding consistent flow of data import this Multiplexing Unit, data flow after this Multiplexing Unit will be changed is carried out multiplexing, and by bridge-jointing unit described data flow is outputed to the distant terminal relative with this caller or terminal called.

Above-mentioned SSP 610 and calling and called multimedia negotiation unit 660 transmit information such as negotiation result and carrying address by sip message.

Obviously, this communication system execution mode carries out two sections multimedia negotiation respectively in two sections multimedia calls of the caller of UCB and terminal called.Negotiation draws the calling and called terminal and has consistent encoding and decoding, then can stop the work of demultiplexing unit 630, discharges the demultiplexing resource; Do not negotiate consistent encoding and decoding, then carry out audio frequency and/or video data stream translation, carry out multiplexingly at last, can realize that UCB calls out multimedia connection down, connects such as video.

Consulting Fig. 7, is the theory diagram of communication system second execution mode of the present invention.This communication system comprises SSP 710 and first, second entity.Described first entity comprises caller multimedia negotiation unit 721 and call answering receiving element (figure does not show).Described second entity comprises called multimedia negotiation unit 731 call answering receiving elements and bridge-jointing unit (figure does not show).This SSP 710 comprises retransmission unit 712, multimedia Tip element 711, first linkage unit 713 and second linkage unit 714.This SSP 710 starts to the caller of UCB and two sections multimedia calls of terminal called respectively, and after caller and terminal called are replied described two sections multimedia calls respectively, call answering is mail to the call answering receiving element of described first and second entity.

This first entity also comprises first transmitting element 722, demultiplexing unit 723 and Multiplexing Unit 724, and this second entity also comprises second transmitting element 732, demultiplexing unit 733, encoding and decoding converter 734 and Multiplexing Unit 735.

This caller multimedia negotiation unit 721 be used for the call answering receiving element receive this calling terminal to above-mentioned UCB call answering after, finish multimedia negotiation with described calling terminal, obtain first negotiation result, promptly consult the caller encoding and decoding obtain.This first transmitting element 722 sends the retransmission unit 712 of the carrying address of described first negotiation result and this first entity to this SSP 710;

This retransmission unit 712 is received and is learnt that caller multimedia negotiation unit 721 finishes calling terminal and consult after described first negotiation result, the multimedia Tip element 711 of indicating this SSP 710 is play the audio/video prompting that is continuing called through 713 pairs of these calling terminals of this first linkage unit, and this called multimedia negotiation unit is arrived in the carrying address of transmitting this first negotiation result (being calling party's encoding and decoding) and SSP 710 local terminals.

This called multimedia negotiation unit 731 be used for the call answering receiving element receive this terminal called to above-mentioned UCB call answering after, adopt this first negotiation result and described terminal called to finish multimedia negotiation, obtain second negotiation result.This second transmitting element 732 sends the retransmission unit 712 of the carrying address of described second negotiation result and this second entity to this SSP 710.

Above-mentioned first and second entity is as caller, called calling access point.

Behind these first linkage unit, 713 basis carrying addresses from first entity of this retransmission unit 712, set up first entity and be connected with first carrying of this SSP 710, this carrying connects and is used to play audio/video prompting and transmission data; This second linkage unit 714 is used for receiving described second negotiation result at retransmission unit 712, learn with called finish multimedia negotiation after, set up to carry according to the carrying address of second entity and be connected with second of this SSP710.

H.245, the demultiplexing unit of this first and second entity (723,733) is used for parsing from the multiplex stream from this caller or terminal called controls signaling, Voice ﹠ Video data, and H.245 this controlled signaling transfer to this caller or called multimedia negotiation unit (721,731), be used for multimedia negotiation.This encoding and decoding converter 734 is used in the encoding and decoding of conversion audio frequency and/or video data stream when inconsistent from the audio frequency of calling and called terminal and/or video data stream encoding and decoding.This Multiplexing Unit (724,735) is used for multiplexed audio and video data stream.

Message such as negotiation result and carrying address are transmitted in above-mentioned SSP 710 and calling and called multimedia negotiation unit (721,731) by sip message.

In the real work, when this second negotiation result showed that the calling and called terminal can negotiate consistent encoding and decoding, this communication system adopted bridge-jointing unit to be connected with second carrying in the first carrying connection of setting up and connects these two sections multimedia calls, promptly among Fig. 7:

1) the terminal called direction is arrived in caller:

Caller multimedia negotiation unit 721 control demultiplexing units, 723 demultiplexings, called multimedia negotiation unit 731 control Multiplexing Units 735 are multiplexing, and transmission channel is: calling terminal-demultiplexing unit 723-〉the first linkage unit 713-〉the second linkage unit 714-〉Multiplexing Unit 735-〉transmission channel of terminal called; Or

2) be called into the calling terminal direction:

Called multimedia negotiation unit 731 control demultiplexing units, 733 demultiplexings, caller multimedia negotiation unit 721 control Multiplexing Units 724 are multiplexing, and transmission channel is: terminal called-demultiplexing unit 733-〉the second linkage unit 714-〉the first linkage unit 713-〉Multiplexing Unit 724-〉transmission channel of calling terminal;

In the time can not negotiating consistent encoding and decoding, sound and/or video data stream that the demultiplexing of caller or terminal called goes out are imported this encoding and decoding converter 734, this audio frequency and/or video data stream converted to distant terminal encoding and decoding consistent flow of data import this Multiplexing Unit (724,735), the data flow after this Multiplexing Unit (724,735) will be changed is carried out multiplexing.This communication system adopts this first carrying connection to be connected with second carrying and connects these two sections multimedia calls at last, promptly among Fig. 7:

1) the terminal called direction is arrived in caller:

Caller multimedia negotiation unit 721 control demultiplexing units, 723 demultiplexings, 731 control encoding and decoding converters, the 734 encoding and decoding conversion of called multimedia negotiation unit, and control Multiplexing Unit 735 is multiplexing, and transmission channel is: calling terminal-demultiplexing unit 723-〉the first linkage unit 713-〉the second linkage unit 714-〉encoding and decoding converter 734-〉Multiplexing Unit 735-〉transmission channel of terminal called;

2) be called into the calling terminal direction:

731 control encoding and decoding converters, the 734 encoding and decoding conversion of called multimedia negotiation unit, and control demultiplexing unit 733 demultiplexings, caller multimedia negotiation unit 721 control Multiplexing Units 724 are multiplexing, and transmission channel is: terminal called-demultiplexing unit 733-〉encoding and decoding converter 734-〉the second linkage unit 714-〉the first linkage unit 713-〉Multiplexing Unit 724-〉transmission channel of calling terminal.

Obviously, this communication system execution mode carries out two sections multimedia negotiation respectively in two sections multimedia calls of the caller of UCB and terminal called.Negotiation draws the calling and called terminal and has consistent encoding and decoding, then can not adopt encoding and decoding converter 734 to carry out the conversion of encoding and decoding; Do not negotiate consistent encoding and decoding, then carry out audio frequency and/or video data stream translation, carry out multiplexingly at last, can realize that UCB calls out multimedia connection down, connects such as video.

In other embodiments, described caller multimedia negotiation unit 721 and called multimedia negotiation unit 731 can be arranged in other network element entities outside the SSP 710, such as all existing in the entity, exist with the form of an independent multimedia negotiation unit.

Consulting Fig. 8, is the theory diagram of communication system the 3rd execution mode of the present invention.This communication system comprises SSP 810 and first, second entity.Described first entity comprises caller multimedia negotiation unit 821 and call answering receiving element (figure does not show).Described second entity comprises called multimedia negotiation unit 831 call answering receiving elements and bridge-jointing unit (figure does not show).This SSP 810 comprises retransmission unit 812, multimedia Tip element 811 and first linkage unit 813.This SSP 810 can start to the caller of UCB and two sections multimedia calls of terminal called respectively, and after caller and terminal called are replied described two sections multimedia calls respectively, call answering is mail to the call answering receiving element of described first and second entity.

This first and second entity also comprises demultiplexing unit (823,833) and Multiplexing Unit (824,835) respectively.This first entity also comprises first transmitting element 822.This second entity also comprises second transmitting element 832 and encoding and decoding converter 834.H.245, this demultiplexing unit (823,833) is used for parsing from the multiplex stream from this caller or terminal called controls signaling, Voice ﹠ Video data, and H.245 this is controlled signaling transfer to this caller or called multimedia negotiation unit (821,831).This encoding and decoding converter 834 is used to change the encoding and decoding of audio frequency and/or video data stream.This Multiplexing Unit (824,835) is used for multiplexing signaling, the Voice ﹠ Video data flow H.245 controlled.

This caller multimedia negotiation unit 821 be used for the call answering receiving element receive this calling terminal to above-mentioned UCB call answering after, finish multimedia negotiation with described calling terminal, obtain first negotiation result, promptly consult the caller encoding and decoding obtain.This first transmitting element 822 sends the retransmission unit 812 of the carrying address of described first negotiation result and first entity to this SSP 810;

This retransmission unit 812 is received and is learnt that caller multimedia negotiation unit 821 finishes calling terminal and consult after described first negotiation result, indicates the multimedia Tip element 811 of this SSP 810 to play the audio/video prompting that is continuing called through 813 pairs of these calling terminals of this first linkage unit.

The retransmission unit 812 of this SSP 810 is further transmitted the carrying address of this first negotiation result (being calling party's encoding and decoding) and first entity to this called multimedia negotiation unit 831.

This called multimedia negotiation unit 831 be used for the call answering receiving element receive this terminal called to above-mentioned UCB call answering after, adopt this first negotiation result to finish multimedia negotiation with it, obtain second negotiation result.This second transmitting element 832 sends the retransmission unit 712 of the carrying address of described second negotiation result and called multimedia negotiation unit 831 place entities to this SSP810, and this retransmission unit 812 is passed to caller multimedia negotiation unit 821 with the carrying address of described second negotiation result and called multimedia negotiation unit 831 place entities again.

This first linkage unit 813 is according to first entity carrying address from this retransmission unit 812, setting up first entity is connected with first carrying of this SSP 810, this carrying connects and is used to play audio/video prompting and data flow, and this carrying of dismounting connects after calling terminal being stopped to play the audio/video prompting; Receive second negotiation result in caller multimedia negotiation unit 821, learn with called finish multimedia negotiation after, second, the first carrying address that described first and second entity is received according to calling and called multimedia negotiation unit (821,831) respectively, set up the connection between demultiplexing unit (823,833) and the Multiplexing Unit (824,835), and connect connection between described demultiplexing unit (823,833) and the Multiplexing Unit (824,835) by bridge-jointing unit.Specifically can be: the address of opposite end demultiplexing unit (823,833) or Multiplexing Unit (824,835) place entity is provided in the packet that bridge-jointing unit transmits between demultiplexing unit (823,833) and Multiplexing Unit (824,835), and making can transmitting data stream between demultiplexing unit (823,833) and Multiplexing Unit (824,835).

Message such as negotiation result and carrying address are transmitted in each inner member of above-mentioned SSP 810 and calling and called multimedia negotiation unit (821,831) by sip message.

In the real work, when this second negotiation result shows that the calling and called terminal can negotiate consistent encoding and decoding, walk around SSP 810, adopt first and second carrying address between first and second entity, directly to set up carrying by bridge-jointing unit and connect, and connect this two sections multimedia calls, promptly among Fig. 8:

1) the terminal called direction is arrived in caller:

Caller multimedia negotiation unit 821 control demultiplexing units, 823 demultiplexings, called multimedia negotiation unit 831 control Multiplexing Units 835 carry out multiplexing, transmission channel is: calling terminal-demultiplexing unit 823-〉Multiplexing Unit 835-〉terminal called; Or

2) be called into the calling terminal direction:

Called multimedia negotiation unit 831 control demultiplexing units 833 demultiplexings, caller multimedia negotiation unit 821 control Multiplexing Units 824 are multiplexing, transmission channel is: terminal called-demultiplexing unit 833-〉Multiplexing Unit 824-〉transmission channel of calling terminal;

In the time can not negotiating consistent encoding and decoding, audio frequency and/or video data stream that the demultiplexing of caller or terminal called goes out are imported this encoding and decoding converter, convert to this audio frequency and/or video data stream with distant terminal encoding and decoding consistent flow of data and import this Multiplexing Unit (824,835), the data flow after this Multiplexing Unit (824,835) will be changed is carried out multiplexing.After negotiation is finished, first linkage unit 813 deletion of SSP 810 is called out in first carrying between SSP 810 and first entity for the A section and is connected, and the process of the connection between demultiplexing unit (823,833) and the Multiplexing Unit (824,835) is set up in 821 triggerings of while caller multimedia negotiation unit.This communication system is walked around SSP 810, and the carrying of adopting bridge-jointing unit to set up connects connects these two sections multimedia calls, and the transfer of data of two sections callings does not need the transfer through SSP 810.Transmission channel is seen Fig. 8:

1) the terminal called direction is arrived in caller:

Caller multimedia negotiation unit 821 control demultiplexing units, 823 demultiplexings, called multimedia negotiation unit 831 control Multiplexing Units 835 carry out multiplexing, and control encoding and decoding converter 834 and carry out encoding and decoding, transmission channel is: calling terminal-demultiplexing unit 823-〉encoding and decoding converter 834-〉Multiplexing Unit 835-〉terminal called; Or

2) be called into the calling terminal direction:

Called multimedia negotiation unit 831 control demultiplexing units, 833 demultiplexings, and control encoding and decoding converter 834 carries out encoding and decoding, caller multimedia negotiation unit 821 control Multiplexing Units 824 are multiplexing, and transmission channel is: terminal called-demultiplexing unit 833-〉encoding and decoding converter 834-〉Multiplexing Unit 824-〉calling terminal.

Obviously, this communication system execution mode carries out two sections multimedia negotiation respectively in two sections multimedia calls of the caller of UCB and terminal called.Negotiation draws the calling and called terminal and has consistent encoding and decoding, does not then need to adopt encoding and decoding converter 834 to carry out sound and/or video conversion; When not negotiating consistent encoding and decoding, then carry out audio frequency and/or video data stream translation, carry out multiplexingly at last, can realize that UCB calls out multimedia connection down, connects such as video.

Consult Fig. 9, the present invention also provides communication equipment the 3rd execution mode, comprising:

Routing forwarding unit 910 is used for the UCB from SSP is called out the mobile services switching centre/Visited Location Registor that routes to the calling terminal place;

Call answering receiving element 940 is used to receive replying of described UCB calling, and described call answering is sent to described call answering receiving element via Service Switching Point;

Multimedia negotiation unit 920, be used for receive described calling terminal to this calling reply the back with described calling terminal finish multimedia negotiation;

Transmitting element 930, the carrying address that sends described negotiation result and described communication equipment be to this SSP, and report to caller SCP via this SSP and to reply indication.

Bridge-jointing unit 950, be used for consult to finish the back connect the transfer of data of described calling by described Service Switching Point or obtaining called calling access point address after the direct transfer of data of the described calling of connection.

The present invention also provides communication equipment the 4th execution mode, comprising:

Routing forwarding unit 1010 is used for the UCB from SSP is called out the mobile services switching centre/Visited Location Registor that routes to the terminal called place;

Negotiation result receiving element 1020 is used to receive calling terminal one side's multimedia negotiation result;

Call answering receiving element 1040 is used to receive replying of described UCB calling, and described call answering is sent to described call answering receiving element via Service Switching Point;

Multimedia negotiation unit 1030, be used for receiving terminal called to after the replying of this calling, finish multimedia negotiation according to this multimedia negotiation result and this terminal called, the carrying address of send consulting the called encoding and decoding that obtain and described communication equipment is to this SSP, and reports to caller SCP via this SSP and to reply indication.

Bridge-jointing unit 1050, be used for consult to finish the back connect the transfer of data of described calling by described Service Switching Point or obtaining calling access point address after the direct transfer of data of the described calling of connection.

More than a kind of communication system provided by the present invention, communication equipment and multimedia calling method are described in detail by execution mode, the explanation of above execution mode just is used for help understanding method of the present invention and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims

1. a communication system is characterized in that, comprising:

Service Switching Point starts to respectively based on the caller of USSD callback and two sections multimedia calls of terminal called,

First entity comprises caller multimedia negotiation unit, is used for after described calling terminal is to above-mentioned call answering finishing multimedia negotiation and obtains first negotiation result with it,

Second entity comprises called multimedia negotiation unit, is used for after described terminal called is to above-mentioned call answering, finishes multimedia negotiation and obtains second negotiation result according to described first negotiation result and terminal called.

2. communication system according to claim 1 is characterized in that,

Described first entity further comprises demultiplexing unit, is used for parsing control signaling, Voice ﹠ Video data, and described control signaling imported described called multimedia negotiation unit from multiplex stream from described calling terminal,

Described second entity comprises Multiplexing Unit, is used for carrying out data multiplexing and outputing to described terminal called,

Wherein, described called multimedia negotiation unit and terminal called are finished multimedia negotiation specifically: compare according to calling terminal encoding and decoding in described first negotiation result and terminal called edit code, judge whether to negotiate consistent encoding and decoding, in the time can negotiating consistent encoding and decoding, the Voice ﹠ Video data that described demultiplexing goes out are imported described Multiplexing Unit.

3. communication system according to claim 1 is characterized in that,

Described first entity further comprises first transmitting element, be used for after multimedia negotiation is finished in described caller multimedia negotiation unit, send first negotiation result that described negotiation obtains to described called multimedia negotiation unit through described Service Switching Point, and the first carrying address that sends described first entity is to described Service Switching Point

Described second entity further comprises second transmitting element, is used for after finishing multimedia negotiation with terminal called, second of described second negotiation result and described second entity carried the address send to described Service Switching Point,

Wherein, the described first and second carrying addresses are used to described Service Switching Point to set up respectively and being connected of described first and second entities.

4. communication system according to claim 1 is characterized in that,

Described first entity further comprises first transmitting element, be used for called finish multimedia negotiation after, through described Service Switching Point send the first carrying address of described first entity and first negotiation result of consulting to obtain to described called multimedia negotiation unit,

Described second entity further comprises second transmitting element, be used for called finish multimedia negotiation after, second carrying address and second negotiation result of described second entity sent to described caller multimedia negotiation unit through described Service Switching Point,

Wherein, second, the first carrying address that described first and second entities are received according to calling and called multimedia negotiation unit respectively is switched to the transfer of data of opposite end entity.

5. communication system according to claim 4 is characterized in that, described first and second entities integrate.

6. communication system according to claim 1, it is characterized in that, described Service Switching Point further comprises the multimedia Tip element, is used for finishing calling terminal in described caller multimedia negotiation unit and consults the audio/video prompting that the back is being continued called to described calling terminal broadcast.

7. communication system according to claim 1 is characterized in that, described Service Switching Point further comprises and report the unit, is used for after finishing described multimedia negotiation reporting to the calling service control point replying indication.

8. a communication equipment is characterized in that, comprising:

The call answering receiving element is used to receive the call answering based on the USSD callback,

The multimedia negotiation unit is used for describedly finishing multimedia negotiation with answer party after based on the call answering of USSD callback receiving.

9. communication equipment according to claim 8 is characterized in that described communication equipment is a Service Switching Point, and further comprises demultiplexing unit and Multiplexing Unit,

Described demultiplexing unit is used for parsing control signaling, Voice ﹠ Video data from the multiplex stream from described caller or terminal called, and described control signaling imported described multimedia negotiation unit, described Multiplexing Unit is used for carrying out data multiplexing and outputing to distant terminal, described encoding and decoding converter is used for data are carried out encoding and decoding conversion

Wherein, described negotiation element specifically is used for finishing multimedia negotiation and obtaining first negotiation result with calling terminal, adopt described first negotiation result and terminal called to finish multimedia negotiation and obtain second negotiation result, judge whether the calling and called terminal can negotiate consistent encoding and decoding, and when described second negotiation result shows that the calling and called terminal can negotiate consistent encoding and decoding, stop the work of described demultiplexing unit, directly transmit described multiplex stream from caller and terminal called.

10. communication equipment according to claim 9, it is characterized in that, further comprise the encoding and decoding converter, be used in the time can not negotiating consistent encoding and decoding, import sound and/or video data stream that the demultiplexing of described caller or terminal called goes out, convert to described audio frequency and/or video data stream with distant terminal encoding and decoding consistent flow of data and import described Multiplexing Unit.

11. communication equipment according to claim 8 is characterized in that,

Described call answering receiving element specifically is used to receive the call answering based on the USSD callback, and described call answering is sent to described call answering receiving element via Service Switching Point,

And, further comprise bridge-jointing unit, be used for after negotiation is finished, connecting the transfer of data of described calling.

12. communication equipment according to claim 11 is characterized in that,

Described answer party is a calling terminal, described multimedia negotiation unit specifically is used for carrying out multimedia negotiation to obtain calling party's multimedia negotiation result with described calling terminal, and further comprise transmitting element, be used for the carrying address of described calling party's multimedia negotiation result and described communication equipment is sent to described Service Switching Point

Described bridge-jointing unit specifically be used for consult to finish the back connect the transfer of data of described calling by described Service Switching Point or obtaining called calling access point address after the direct transfer of data of the described calling of connection.

13. communication equipment according to claim 11 is characterized in that,

Described answer party is a terminal called, and further comprise receiving element and transmitting element, described receiving element is used to receive the calling party's multimedia negotiation result from described Service Switching Point, and it is imported described multimedia negotiation unit, carry out multimedia negotiation to obtain callee's multimedia negotiation result with described terminal called, described transmitting element is used for the carrying address of described callee's multimedia negotiation result and described communication equipment is sent to described Service Switching Point

Described bridge-jointing unit specifically be used for consult to finish the back connect the transfer of data of described calling by described Service Switching Point or obtaining calling access point address after the direct transfer of data of the described calling of connection.

14. a multimedia calling method comprises:

The callback based on USSD that starts to caller is called out;

After described caller is replied, carry out the multimedia negotiation first time with described caller;

Starting to the called callback based on USSD calls out;

Behind described called party answer, according to the result and the described called multimedia negotiation second time of carrying out of described first time of multimedia negotiation;

After consulting successfully, connect caller and callee's calling.

15. multimedia calling method according to claim 14 is characterized in that,

Before consulting successfully, further comprise: always in the multiplex stream of calling and called, parse encoding and decoding separately respectively;

Described according to the first time multimedia negotiation the result calledly carry out for the second time that multimedia negotiation comprises with described: judge whether the calling and called terminal can negotiate consistent encoding and decoding;

For not the time, will convert the demux stream consistent in judged result to from caller or callee's demux stream with the other side's encoding and decoding, and multiplexing described demux stream through the conversion encoding and decoding.

16. multimedia calling method according to claim 14 is characterized in that, described calling/called step of carrying out multimedia negotiation is returned call answered signal by calling/called side MSC/VLR trigger to Service Switching Point.

17. multimedia calling method according to claim 14 is characterized in that,

After the multimedia negotiation success first time, report caller to reply indication to service control point, described service control point issues indication and starts to called calling;

After the multimedia negotiation success second time, report the called party answer indication to described service control point, described service control point issues connects caller and called indication.

18. multimedia calling method according to claim 17 is characterized in that,

After the step of caller being finished negotiation, to service control point, report and reply indication and take a step forward and comprise: to the caller play cuing called audio/video that continuing;

After receiving described connection caller and called indication, further comprise: stop the broadcast of described prompting audio/video.