CN101217788B - A calling method to start a successive operation of multimedia conversation - Google Patents
A calling method to start a successive operation of multimedia conversation Download PDFInfo
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- CN101217788B CN101217788B CN2008100003659A CN200810000365A CN101217788B CN 101217788 B CN101217788 B CN 101217788B CN 2008100003659 A CN2008100003659 A CN 2008100003659A CN 200810000365 A CN200810000365 A CN 200810000365A CN 101217788 B CN101217788 B CN 101217788B
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Abstract
The invention discloses a calling method of a multimedia session continuous service, which is applied to multimedia calling which comprises a circuit switch field voice conversation and is initialized by a multimedia session continuous service contract subscriber. The method comprises that a multimedia session continuous conversation identification is added in the voice call information which is initiated by a circuit switch field, the voice call information is sent to a multimedia session continuous service server which judges that the conversion is the multimedia session continuous service conversion according to the multimedia session continuous conversation identification, thus waiting for other parts of the multimedia session continuous service conversation and achieving combination of multimedia session continuous service conversation. The invention can achieve the session combination function under the condition that the call demand message of the circuit switch field reaches the multimedia session continuous service server before the call demand message of the group switch field.
Description
Technical field
The present invention relates to the communications field, relate more specifically to work the implementation method of exhaling in a kind of IMS (IP Multimedia CoreNetwork Subsystem, IP Multimedia System are called for short IMS) field multimedia conversation continuity business.
Background technology
IP (network interconnection agreement, Internet Protocol, abbreviation IP) IP multimedia subsystem, IMS is by third generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) a kind of IP-based network framework that proposes, it has made up an opening and service environment flexibly, support multimedia application, and provide abundant multimedia service for the user.
IMS is based on the communication network framework of IP, irrelevant with access technology, except being GPRS (General Packet Radio Service, GPRS), WLAN (Wireless LocalArea Network, WLAN (wireless local area network)) etc. packet access network provides outside the business, can also be GSM (Global System for Mobile communications, global system for mobile communications), UMTS mobile cellular networks such as (Universal Mobile Telecommunications System, unified mobile communcations systems) provides professional.
Mobile cellular network such as GSM, UMTS adopts circuit-switched technology, is called circuit switching (CircuitSwitched is called for short CS) territory, can provide basic speech business for the user, and based on the supplementary service of speech business.When IMS was inserted in the CS territory, it developed into a kind of access way, and business provides by IMS is unified fully, and this technology is called IMS centralized traffic (IMS Centralized Service is called for short ICS).Fig. 1, Fig. 2, Fig. 3 are respectively three kinds of frameworks of ICS, and related network elements and signaling paths have for simplicity only drawn.
The configuration diagram when mode that Fig. 1 adopts for the ICS function is I1-cs, unstructured supplementary service data (Unstructured Supplementary Service Data is called for short USSD) is adopted in the session control path, be connected to IMS circuit domain control function (IMS CS Control Function is called for short ICCF); The configuration diagram when mode that Fig. 2 adopts for the ICS function is I1-ps, the session control path is based upon on low speed PS (Packet Switch, the packet switching) territory; The configuration diagram when mode that Fig. 3 adopts for the ICS function is enhancement mode mobile switching centre (Mobile Switch Center, abbreviation MSC), enhanced MSC is served as the transducer between CS territory and the IMS territory.
(User Equipment UE) need keep the continuity of Multimedia session to user terminal under various access waies simultaneously.At this moment, keep continuity when the Multimedia session of user UE not only will switch between packet switching (PS) territory,, keep continuity in the switching in PS territory and PS territory+CS territory simultaneously in PS territory and CS territory.Guarantee that this successional technology is called IMS multimedia conversation continuity (Multimedia Session Continuity is called for short MMSC) business.
According to prior art,, when wherein using CS territory voice, must use the ICS technology to be linked among the IMS when the MMSC contracted user initiates multimedia service.Fig. 4 has shown MMSC user how when having the network insertion of CS territory ability, the flow process that makes a call.
As can be seen from the figure, MMSC user's session separated into two parts, voice conversation is linked into (step 405～408) among the IMS via ICS, and the Multimedia session except that voice enters (step 401～404) among the IMS via the PS territory.(Application Server AS) locates to merge into a session, continues to send to far-end at the MMSC server in these two sessions.
Yet in the present technology, if step 403 arrives MMSC AS prior to step 408, be exactly SIP (the Session Initiation Protocol in PS territory, SIP) call request message arrives MMSC AS prior to the call request message in CS territory, MMSC AS can wait for CS territory phonological component according to the MMSC session information in the SIP call request message in PS territory.But when step 408 arrives MMSC AS prior to step 403, be the SIP call request message arrival MMSC AS of the call request message in CS territory prior to the PS territory, owing to can not carry the MMSC session information from the calling of ICS, MMSC AS will can not wait for the multimedia call in PS territory, but continue to call out, can't finish the merged session function like this, in this case.
As seen, the function of finishing merged session that prior art can not be complete.
Summary of the invention
Technical problem to be solved by this invention is the call method that rises that proposes a kind of multimedia conversation continuity business, rises in the multimedia that comprises CS territory voice that the MMSC contracted user initiates and exhales, and finishes the merged session function.
In order to solve the problems of the technologies described above, the invention provides a kind of call method that rises of multimedia conversation continuity business, during the multimedia that comprises the circuit commutative field voice conversation that is applied to multimedia conversation continuity business contracted user initiation rises and exhales, described method comprises: to increasing the multimedia conversation continuity session identification in the speech call information of circuit commutative field initiation, and described speech call information sent to the multimedia conversation continuity business server, judging this session by described multimedia conversation continuity business server according to described multimedia conversation continuity session identification is the multimedia conversation continuity business session, thereby wait for the remainder of multimedia conversation continuity business session, and finish the multimedia conversation continuity business merged session.
Further, described method also comprises: to increasing the multimedia conversation continuity session identification in the call information of packet-switched domain initiation, and described call information sent to the multimedia conversation continuity business server, judging this session by described multimedia conversation continuity business server according to described multimedia conversation continuity session identification is the multimedia conversation continuity business session, thereby wait for the remainder of multimedia conversation continuity business session, and finish the multimedia conversation continuity business merged session.
Further, described speech call information is sent to the multimedia conversation continuity business server, comprising: the speech call information that circuit commutative field is initiated is got back to the multimedia conversation continuity business server of home IP multi-media subsystem network by IP Multimedia System centralized traffic function route.
Further, the speech call information that described circuit commutative field is initiated at first arrives the IP Multimedia System circuit domain control function module of home IP multi-media subsystem network, is routed then to Multimedia session continuity business server.
Further, if described IP Multimedia System centralized traffic function adopts the I1-cs mode, then subscriber equipment adds described multimedia conversation continuity session identification in the unstructured supplementary service data signaling.
Further, if described IP Multimedia System centralized traffic function adopts the I1-ps mode, then subscriber equipment adds described multimedia conversation continuity session identification in the SIP signaling in IP Multimedia System centralized traffic session control path.
Further, if described IP Multimedia System centralized traffic function adopts the mobile switching centre's mode that strengthens, subscriber equipment sends to increases described multimedia conversation continuity session identification in the call request that strengthens mobile switching centre, strengthen mobile switching centre and increasing described multimedia conversation continuity session identification in the SIP call request of far-end.
Further, the described multimedia conversation continuity business merged session of finishing, comprise: described multimedia conversation continuity business server is according to the related information of the conference call that receives, and session associated finish the multimedia conversation continuity business merged session; The related information of described conference call can be a called number, perhaps caller and called number.
A call method of multimedia conversation continuity business provided by the invention, increase the MMSC service identification by the speech call information that the CS territory is initiated, when the call information in CS territory arrives MMSC AS, because the MMSC service identification in the call information, making MMSC AS can judge this is the MMSC session, need to wait for all the other parts of session, thereby the session in PS territory is waited for, finish the merged session function.
Description of drawings
Fig. 1 is for being in the ICS framework, the configuration diagram when mode that the ICS function adopts is I1-cs;
Fig. 2 is for being in the ICS framework, the configuration diagram when mode that the ICS function adopts is I1-ps;
Fig. 3 is for being in the ICS framework, the configuration diagram when mode that the ICS function adopts is enhanced MSC;
Fig. 4 is for being the existing MMSC user flow chart that makes a call;
Fig. 5 is a call method flow chart of multimedia conversation continuity business of the present invention;
Fig. 6 is that mode that ICS function of the present invention adopts rises when being I1-cs and exhales flow process implementation one;
Fig. 7 is that mode that ICS function of the present invention adopts rises when being I1-cs and exhales flow process implementation two;
Fig. 8 is that mode that ICS function of the present invention adopts rises when being I1-ps and exhales flow process;
Fig. 9 is that mode that ICS function of the present invention adopts rises when being enhanced MSC and exhales flow process.
Embodiment
The scene that the present invention is suitable for is that the user is the MMSC contracted user, also is the ICS contracted user simultaneously.User UE place in circuit exchange CS territory, perhaps place in circuit exchange CS territory and packet switching PS territory.But its PS is low speed IP to be inserted, and speech business can not be provided.This moment, the user initiated to comprise the multimedia service of speech business.
Core concept of the present invention is: increase the MMSC session identification by the audio call that the CS territory is initiated, when the calling in CS territory arrives MMSC AS, because the MMSC session identification in the call information, making MMSC AS can judge this is the MMSC session, will wait for all the other parts of session.
As follows to flow process simplified summary of the present invention below:
MMSC user exhales in the process rising, and has comprised CS territory business (as voice) if call out, and has used the ICS technology to handle the calling in CS territory.Exhale side rising, to have 2 sessions the MMSC AS from user UE to user attaching IMS territory.One is the voice conversation A that user UE initiates by the CS territory, and one is the Multimedia session B that user UE initiates in the PS territory.
After MMSC AS receives session A message related to calls earlier, by its MMSC session identification, know that this is a MMSC session, need to wait for all the other parts of session.After MMSC AS receives session B message related to calls earlier, also be equally to handle, wait for the session remainder.
After MMSC AS received session A and B, it was a session with these two merged session that MMSC AS serves as back-to-back agency's (Back toBack User Agent, B2BUA), continued to make a call to the destination.
Below in conjunction with accompanying drawing technical scheme of the present invention is described in detail.
With reference to shown in Figure 5, call method flow chart for multimedia conversation continuity business of the present invention, the calling that MMSC user UE initiates in the CS territory is displayed by the step 505 among the figure～508, the calling that MMSC user UE initiates in the PS territory is displayed by the step 501 among the figure～504, said method comprising the steps of:
1) MMSC user UE inserts CS territory and PS territory simultaneously;
2) MMSC user UE initiates Multimedia session, and wherein audio call makes a call by the ICS function in CS territory (step 505), and remaining Multimedia session is called out (step 501～504) initiation in the PS territory.
3) MMSC user UE increases MMSC session identification (step 501 and step 505) in the calling of CS territory initiation and the calling of PS territory initiation, is used for representing the MMSC session information;
4) MMSC user UE gets back to ownership IMS network in the calling of CS territory initiation by ICS function route, and calls out arrival MMSC AS (step 505～508); MMSC user UE initiates IMS calling route and gets back to ownership IMS network in the PS territory, and calls out arrival MMSC AS (step 501～504);
5) MMSC AS is a session with two merged session, continues to send to the destination.(step 509～511)
Wherein, step 501 and 505 walks abreast, if step 508 arrives prior to step 503, because step 508 has the MMSC session information, understands waiting step 503 equally and arrives.
Furthermore, 4) in the calling in CS territory at first arrive ownership IMS network ICCF (IMS circuit domain control function), be routed AS then to MMSC;
Because existing ICS function has three kinds of frameworks, so 4) in the calling initiated in the CS territory as MMSC user UE get back to ownership IMS network by ICS function route, being carried in three kinds of frameworks of MMSC session identification has different modes.If the ICS function adopts the I1-cs mode, user UE adds the MMSC session identification in the USSD signaling; If the ICS function adopts the I1-ps mode, user UE adds the MMSC session identification in the SIP signaling in ICS session control path; If the ICS function adopts the enhanced MSC mode, user UE increases the MMSC session identification in the call request that sends to MSC, and enhanced MSC is increasing the MMSC session identification in the SIP of far-end call request;
Here it is pointed out that 5) in MMSC according to the related information of 2 conference call receiving with these two session associations, merge into a session, the related information of conference call can be a called number, perhaps caller and called number.
Below by the example in the concrete application technical solution of the present invention is carried out exemplary illustration.
Fig. 6 is that mode that ICS function of the present invention adopts works that to exhale flow process implementation one, its background be MMSC user UE when inserting IMS in the CS territory when being I1-cs, and the mode that the ICS function adopts is I1-cs, and its multimedia groupware is carried on the PS territory.The concrete steps that MMSC user UE preparation initiation comprises the multimedia call of CS territory voice are:
601) MMSC user UE sends session information by USSD on ICS session control path, and it comprises the number of called subscriber UE2, the MMSC session identification, and this USSD message at first sends to VMSC (Visited Mobile Switching Center);
602) VMSC gives the ICCF of ownership with the USSD forwards of receiving, network element that relates on the forward-path and this patent are irrelevant, repeat no more herein;
603) MMSC user UE sends call setup message in the CS territory to VMSC, and the destination address of message is the number of ICCF;
604) after VMSC receives call setup message, send ISUP (ISDN User Part, ISUP) initial address message to MGCF (MGCF) according to called number;
605) MGCF sends the SIP conversation request to ICCF, and wherein called number is the ICCF number, and this message at first sends to CSCF (Call Session Control Function, call server controlled function) module;
606) trigger by iFC (Initial Filter Criteria, inceptive filtering criterion), CSCF sends to ICCF with the SIP call request of receiving;
607) ICCF is after the message of receiving step 602 and 606, it is associated, and by the MMSC session identification that in step 602, receives, know that this is the part of MMSC session, ICCF sends the SIP call request, its destination address is the UE2 address that step 602 is received, this SIP request at first sends to CSCF;
608) trigger by iFC, CSCF sends to MMSC AS with the SIP call request of receiving;
609) MMSC user UE sends the SIP call request in the PS territory to the destination, and its destination address is the UE2 number, and described SIP call request comprises the MMSC conversation message, and this SIP call request message at first sends to CSCF;
610) after CSCF receives step 609 message, trigger by iFC, CSCF sends to MMSC AS with the SIP call request of receiving;
611) MMSC AS associates according to session information after the message of receiving step 608 and 610, knows that this is that a MMSC calls out.2 merged session that MMSC AS will receive are served as B2BUA, continue to the destination initiation session, and this SIP conversation request at first sends to CSCF;
612) CSCF is routed to destination address with the SIP call request, and omit in process path wherein.
Annotate, step 601,603, the 609th walks abreast, and does not have the sequencing restriction, and the later call establishment prior art of step 612 has, and no longer repeats herein.
The mode that Fig. 7 adopts for ICS function of the present invention rises when being I1-cs and exhales flow process implementation two, and its background is MMSC user UE when inserting IMS in the CS territory, and the mode that the ICS function adopts is I1-cs, and its multimedia groupware is carried on the PS territory.MMSC user UE prepares to initiate to comprise the multimedia call of CS territory voice, and the ICCF address in the calling on the ICS carrying control path is dynamically to obtain, and its concrete steps are:
701) MMSC user UE sends session information by USSD on ICS session control path, and it comprises the number of called subscriber UE2, the MMSC session identification, and this USSD message at first sends to VMSC;
702) VMSC gives the ICCF of ownership with the USSD forwards of receiving, network element that relates on the forward-path and this patent are irrelevant, repeat no more;
703) after MMSC AS receives step 702 message, preserve the session information in the USSD message, as called UE 2 numbers, MMSC session identification etc., and distribute an E.164 IMS routing number IMRN of form;
704) MMSC AS returns to MMSC user UE with the IMRN (IP Multimedia Routing Number) that distributes by USSD message, and wherein the network element of process and this patent are irrelevant on the path, ignore;
705) after MMSC user UE receives IMRN, send call setup message in the CS territory to VMSC, the destination address of message is the number of the IMRN that receives;
706) after VMSC receives call setup message, send the ISUP initial address message to MGCF according to called number;
707) MGCF sends the SIP conversation request to ICCF, and wherein called number is IMRN, and this message at first sends to CSCF;
708) trigger by iFC, CSCF sends to ICCF with the SIP call request of receiving;
709) ICCF is after receiving step 708 message, and the associating information of preserving according to IMRN and step 703 gets up, and the MMSC session identification by preserving in the step 703, knows that this is the part of MMSC session.ICCF sends the SIP call request, comprises called UE 2 numbers and MMSC session identification in the SIP call request, and its destination address is the UE2 address that step 702 is received, this SIP request at first sends to CSCF;
710) trigger by iFC, CSCF sends to MMSC AS with the SIP call request of receiving;
711) MMSC user UE sends the SIP call request in the PS territory to the destination, and its destination address is the UE2 number, and described SIP call request comprises the MMSC conversation message, and this SIP call request message at first sends to CSCF;
712) after CSCF receives step 711 message, trigger by iFC, CSCF sends to MMSC AS with the SIP call request of receiving;
713) MMSC AS associates according to session information after the message of receiving step 710 and 712, knows that this MMSC calls out.2 merged session that MMSC AS will receive are served as B2BUA, continue to the destination initiation session, and this SIP conversation request at first sends to CSCF;
714) CSCF is routed to destination address with the SIP call request, and omit in process path wherein.
Annotate, step 701 is serials to step 710, and step 701 and 711 walks abreast, and perhaps step 705 and step 711 are parallel.The later call establishment prior art of step 714 has, and no longer repeats
The mode that Fig. 8 adopts for ICS function of the present invention rises when being I1-ps and exhales flow process, and its background is MMSC user UE when inserting IMS in the CS territory, and the mode that the ICS function adopts is I1-ps, and its multimedia groupware is carried on the PS territory.The concrete steps that MMSC user UE preparation initiation comprises the multimedia call of CS territory voice are:
801) MMSC user UE promptly on the PS territory, sends the SIP conversation request to called UE 2 on ICS session control path, and its called number is the number of user UE2, and comprises the MMSC session identification.Because this request purpose is to set up ICS to call out the control path, this call request does not comprise SDP (Session Description Protocol, Session Description Protocol) information.This message at first sends to CSCF;
802) trigger by iFC, CSCF sends to ICCF with the SIP call request of receiving;
803) MMSC user UE sends call setup message in the CS territory to VMSC, and the destination address of message is the number of ICCF;
804) after VMSC receives call setup message, send ISUP full address message to MGCF according to called number;
805) MGCF sends the SIP conversation request to ICCF, and wherein called number is the ICCF number, and this message at first sends to CSCF;
806) trigger by iFC, CSCF sends to ICCF with the SIP call request of receiving;
807) ICCF associates it after the message of receiving step 802 and 806, and by the MMSC session identification in the step 802, knows that this is the part of MMSC session.ICCF sends the SIP call request, and its destination address is the UE2 address that step 802 is received, and comprises the MMSC session identification, and this SIP request at first sends to CSCF;
808) trigger by iFC, CSCF sends to MMSC AS with the SIP call request of receiving;
809) MMSC user UE sends the SIP call request in the PS territory to the destination, and its destination address is the UE2 number, and comprises MMSC session information and session SDP information, and this message at first sends to CSCF;
810) after CSCF receives step 809 message, trigger by iFC, CSCF sends to MMSC AS with the SIP call request of receiving;
811) MMSC AS associates according to session information after the message of receiving step 808 and 810, knows that this MMSC calls out.2 merged session that MMSC AS will receive are served as B2BUA, continue to the destination initiation session, and this SIP conversation request at first sends to CSCF;
812) CSCF is routed to destination address with the SIP call request, and omit in process path wherein.
Annotate, step 801,803, the 809th walks abreast, and does not have the sequencing restriction, and the later call establishment prior art of step 812 has, and no longer repeats.
The mode that Fig. 9 adopts for ICS function of the present invention rises when being enhanced MSC and exhales flow process, and its background is MMSC user UE when inserting IMS in the CS territory, and the mode that the ICS function adopts is an enhanced MSC, and its multimedia groupware is carried on the PS territory.The concrete steps that MMSC user UE preparation initiation comprises the multimedia call of CS territory voice are:
901) MMSC user UE sends call setup message in the CS territory to enhanced MSC, and the destination address of message is called UE 2 addresses, and the MMSC session identification is arranged;
902) after enhanced MSC is received call setup message, send the SIP call request to called number, wherein called number is the UE2 number, and described SIP call request comprises the MMSC session identification, and this message at first sends to CSCF;
903) trigger by iFC, CSCF sends to ICCF with the SIP call request of receiving;
904) MMSC user UE sends the SIP call request in the PS territory to the destination, and its destination address is the UE2 number, and described SIP call request comprises the MMSC session identification, and this message at first sends to CSCF;
905) after CSCF receives step 904 message, trigger by iFC, CSCF sends to MMSC AS with the SIP call request of receiving;
906) MMSC AS associates according to session information after the message of receiving step 903 and 905, knows that this is that a MMSC calls out, 2 merged session that MMSC AS will receive, serve as B2BUA, continue to the destination initiation session, this SIP conversation request at first sends to CSCF;
907) CSCF is routed to destination address with the SIP call request, and omit in process path wherein.
Annotate, step 901, the 904th walks abreast, and does not have the sequencing restriction, and the later call establishment prior art of step 907 has, and no longer repeats.
As seen, the present invention increases the MMSC service identification by the audio call that the CS territory is initiated, making MMSC AS to judge this session according to described MMSC service identification is the MMSC session, will wait for all the other parts of session, thereby the complete merged session function of finishing, and the present invention has multiple implementation in actual applications, can select according to actual conditions.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (8)
1. a multimedia conversation continuity business plays call method, during the multimedia that comprises the circuit commutative field voice conversation that is applied to multimedia conversation continuity business contracted user initiation rises and exhales, it is characterized in that, described method comprises: to increasing the multimedia conversation continuity session identification in the speech call information of circuit commutative field initiation, and described speech call information sent to the multimedia conversation continuity business server, judging this session by described multimedia conversation continuity business server according to described multimedia conversation continuity session identification is the multimedia conversation continuity business session, thereby wait for the remainder of multimedia conversation continuity business session, and finish the merging of the Multimedia session that voice conversation that the user that comprises in the multimedia conversation continuity business session initiates by circuit commutative field and user initiate at packet-switched domain.
2. the method for claim 1, it is characterized in that, described method also comprises: to increasing the multimedia conversation continuity session identification in the call information of packet-switched domain initiation, and described call information sent to the multimedia conversation continuity business server, judging this session by described multimedia conversation continuity business server according to described multimedia conversation continuity session identification is the multimedia conversation continuity business session, thereby wait for the remainder of multimedia conversation continuity business session, and finish the multimedia conversation continuity business merged session.
3. the method for claim 1 is characterized in that,
Described speech call information is sent to the multimedia conversation continuity business server, comprising: the speech call information that circuit commutative field is initiated is got back to the multimedia conversation continuity business server of home IP multi-media subsystem network by IP Multimedia System centralized traffic function route.
4. method as claimed in claim 3 is characterized in that,
The speech call information that described circuit commutative field is initiated at first arrives the IP Multimedia System circuit domain control function module of home IP multi-media subsystem network, is routed then to Multimedia session continuity business server.
5. method as claimed in claim 3 is characterized in that,
If described IP Multimedia System centralized traffic function adopts the 11-cs mode, then subscriber equipment adds described multimedia conversation continuity session identification in the unstructured supplementary service data signaling.
6. method as claimed in claim 3 is characterized in that,
If described IP multimedia hand system centralized traffic function adopts the I1-ps mode, then subscriber equipment adds described multimedia conversation continuity session identification in the SIP signaling in IP Multimedia System centralized traffic session control path.
7. method as claimed in claim 3 is characterized in that,
If described IP Multimedia System centralized traffic function adopts the mobile switching centre's mode that strengthens, subscriber equipment sends to increases described multimedia conversation continuity session identification in the call request that strengthens mobile switching centre, strengthen mobile switching centre and increasing described multimedia conversation continuity session identification in the SIP call request of far-end.
8. the method for claim 1 is characterized in that,
The described multimedia conversation continuity business merged session of finishing comprises: described multimedia conversation continuity business server is according to the related information of the conference call that receives, and session associated finish the multimedia conversation continuity business merged session; The related information of described conference call can be a called number, perhaps caller and called number.
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| US20100034168A1 (en) * | 2008-08-08 | 2010-02-11 | Kaniz Mahdi | System and Method for Enabling SR-VCC with Shared IMPU |
| CN101686519B (en) * | 2008-09-27 | 2012-11-28 | 中兴通讯股份有限公司 | Switch method for keeping continuity of multimedia session |
| CN101742589B (en) | 2008-11-07 | 2011-06-01 | 华为终端有限公司 | Method, user equipment and server for transferring multimedia session |
| CN101990305B (en) * | 2009-07-30 | 2016-11-23 | 中兴通讯股份有限公司 | Realize method of calling and call center, application server and the terminal of many sessions |
| CN101998568B (en) * | 2009-08-14 | 2013-08-07 | 中兴通讯股份有限公司 | Method for realizing multi-session service continuity |
| CN101924772B (en) * | 2010-08-27 | 2013-05-08 | 北京邮电大学 | Communication system and method supporting cross-network and cross-terminal realization of multimedia session merging |
| CN102572788B (en) * | 2010-12-30 | 2014-10-08 | 中国移动通信集团公司 | Inter-communication system (ICS) and communication method and communication device based on same |
| CN103428894B (en) * | 2013-07-30 | 2016-03-23 | 中国联合网络通信集团有限公司 | Bearer path method for building up, Apparatus and system |
| CN104539586A (en) * | 2014-12-08 | 2015-04-22 | 中兴通讯股份有限公司 | Session management method and device |
| CN106332306A (en) * | 2015-06-30 | 2017-01-11 | 中兴通讯股份有限公司 | Bearer establishment method and apparatus, media gateway and voice bearer establishment system |
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| CN1695350A (en) * | 2002-10-28 | 2005-11-09 | 摩托罗拉公司(在特拉华州注册的公司) | Method and apparatus for multi-media communication over multiple networks |
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| CN101217788A (en) | 2008-07-09 |
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