CN102123211B - Realizing method and system of multi-party calling service - Google Patents
Realizing method and system of multi-party calling service Download PDFInfo
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- CN102123211B CN102123211B CN201110042644.3A CN201110042644A CN102123211B CN 102123211 B CN102123211 B CN 102123211B CN 201110042644 A CN201110042644 A CN 201110042644A CN 102123211 B CN102123211 B CN 102123211B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/1813—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for computer conferences, e.g. chat rooms
- H04L12/1818—Conference organisation arrangements, e.g. handling schedules, setting up parameters needed by nodes to attend a conference, booking network resources, notifying involved parties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/1813—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for computer conferences, e.g. chat rooms
- H04L12/1822—Conducting the conference, e.g. admission, detection, selection or grouping of participants, correlating users to one or more conference sessions, prioritising transmission
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- General Engineering & Computer Science (AREA)
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- Telephonic Communication Services (AREA)
Abstract
The invention discloses a realizing method and system of a multi-party calling service, wherein the method comprises the following step: in the process that a first user terminal calls with one or a plurality of second user terminals through an AS (Autonomous System), the AS ensures that the first user terminal carries out media negotiation with a third user terminal correlated to a request message and ensures that the first user terminal, the second user terminals and the third user terminal respectively carry out media negotiation with an MRS (Media Recognition System) when the AS knows that the first user terminal keeps the current calling and receives the request message that the first user terminal carries a multi-party calling service code, thereby creating multi-party calling among the first user terminal, the second user terminals and the third user terminal; and the media stream sent by each calling party in the calling process is sent to other calling parties after being subjected to sound mixing by the MRS. Unrelated to a terminal, the realizing method and system support various terminals and can realize the random role switching between a three-party calling creater and a participator.
Description
Technical field
The present invention relates to communication field, particularly relate to a kind of implementation method and system of MultiParty Service.
Background technology
MultiParty Service also claims three party service or conference telephone, and it is based upon Call Waiting and the new business kept on basis.
Existing MultiParty Service, is realized by terminal audio mixing or network audio mixing, and according to terminal audio mixing mode, requiring that terminal has can by the ability of multiway calling audio mixing, and general terminal does not have this kind of function, if network audio mixing, normally sent by terminal that refer (instruction) message realizes, as shown in Figure 1, for the schematic flow sheet adopting refer message to realize Three-Way Calling, wherein, in user A and B (by user terminal UE-A and UE-B) communication process, the mode that A adopts calling to keep keeps the call with B, then, set up the call between A and C, the mode that A adopts calling to keep keeps the call with C, then refer message is adopted to set up new session, ABC is added this session by application server (AS), audio mixing is carried out by Media Resource Server (MRS), and terminate original A and B, and the call between A and C.
But having what send refer message capability is generally terminal than higher-end, and ordinary terminal does not have this ability usually.How making ordinary terminal in communication process, can also have MPTY function, is the problem needing solution badly.
Summary of the invention
The technical problem to be solved in the present invention overcomes above-mentioned the deficiencies in the prior art exactly, proposes a kind of implementation method and system of MultiParty Service, how to make ordinary terminal in communication process, can also have the problem of MPTY function to solve.
In order to solve the problem, the invention provides a kind of implementation method of MultiParty Service, comprising:
Pass through in AS communication process in first user terminal and one or more second user terminal, when described AS knows that described first user terminal keeps existing call, and described AS receives described first user terminal when carrying the request message of MultiParty Service code, media negotiation is carried out between the 3rd user terminal that described AS makes first user terminal be associated with described request message, and make described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with MRS respectively, thus set up described first user terminal, MPTY between all second user terminals and the 3rd user terminal, the Media Stream that in communication process, each correspondent sends all sends to other correspondent after MRS audio mixing.
Preferably, said method has following characteristics:
Described request message is carry the invitation message of MultiParty Service code or carry the invitation message of MultiParty Service code and the 3rd user terminal number.
Preferably, said method has following characteristics:
After described AS makes to carry out media negotiation between first user terminal and the 3rd user terminal, also send releasing request, to terminate the session between described first user terminal and all second user terminals to described first user terminal.
Preferably, said method has following characteristics:
Described AS makes the step of carrying out media negotiation between first user terminal and the 3rd user terminal comprise:
Described AS obtains the media information of described first user terminal, sends to the 3rd user terminal, obtains the media information stating the 3rd user terminal, sends to described first user terminal.
Preferably, said method has following characteristics:
The step that described AS makes described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with MRS respectively comprises:
The media information obtaining described first user terminal, all second user terminals and the 3rd user terminal is sent to MRS by described AS respectively, the media information of MRS is sent to respectively described first user terminal, the second user terminal and the 3rd user terminal.
In order to solve the problem, what the invention provides a kind of MultiParty Service realizes system, is applied to AS, comprises MPTY trigger module and media negotiation module, wherein,
Described MPTY trigger module is used for, when knowing that first user terminal and one or more second user terminal first user terminal described in communication process keep existing call, and, receive described first user terminal when carrying the request message of MultiParty Service code, notify described media negotiation module;
Described media negotiation module is used for, according to the notice of described MPTY trigger module, media negotiation is carried out between the 3rd user terminal that first user terminal is associated with described request message, and make described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with MRS respectively, thus set up described first user terminal, MPTY between all second user terminals and the 3rd user terminal.
Preferably, said system has following characteristics:
Described request message is carry the invitation message of MultiParty Service code or carry the invitation message of MultiParty Service code and the 3rd user terminal number.
Preferably, said system also comprises release module,
Described release module is used for, after described media negotiation module makes to carry out media negotiation between first user terminal and the 3rd user terminal, releasing request is sent, to terminate the session between described first user terminal and all second user terminals to described first user terminal.
Preferably, said system has following characteristics:
Described media negotiation module is further used for, when making to carry out media negotiation between first user terminal and the 3rd user terminal, obtain the media information of described first user terminal, send to the 3rd user terminal, obtain the media information stating the 3rd user terminal, send to described first user terminal.
Preferably, said system has following characteristics:
Described media negotiation module is further used for, when making described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with MRS respectively, respectively the media information obtaining described first user terminal, all second user terminals and the 3rd user terminal is sent to MRS, the media information of MRS is sent to respectively described first user terminal, the second user terminal and the 3rd user terminal.
The present invention and terminal have nothing to do, support each Terminal Type of existing network, as supported CDMA (Code Division Multiple Access, code division multiple access) network or GSM (Global System for Mobile Communications, global system for mobile communications) network mobile phone, PSTN (Public Switched Telephone Network, PSTN) terminal, IMS (IP Multimedia Subsystem, IP Multimedia System) terminal etc.; Do not need terminal to support sound mixing function, also do not need terminal support to send the ability of refer message, each Terminal Type of existing network all can operate; The random switching of Three-Way Calling founder and Contributor role can be realized.And along with the emergence of 3G network, CS (speech business) and the fusion of PS (data service) network, make the present invention have boundless development and usage space.
Accompanying drawing explanation
Fig. 1 is that prior art adopts refer message to realize the schematic flow sheet of Three-Way Calling;
Fig. 2 is the network element structure chart of application example of the present invention;
Fig. 3 is the flow chart of application example of the present invention;
Fig. 4 is the concrete signaling process figure of application example of the present invention.
Embodiment
Hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
Basic thought of the present invention is, there is provided a kind of Three-Way Calling arbitrarily to cut business, this business be user A with user B communication process in keep user B, by dialing service code or service code adds assigned number, after service call user C, user C off-hook, ABC enters Three-Way Calling.If wherein user's on-hook, other user can continue call, such as user A on-hook, and BC can continue call, at this moment user B or C can keep existing call, dial service code or service code adds assigned number, other user of service call, such as user C keeps user B, dial service code or service code adds assigned number, after service call user A, user A off-hook, ABC enters Three-Way Calling, realizes the random switching of Three-Way Calling founder and Contributor role.In addition, after ABC enters Three-Way Calling, the user of this Three-Way Calling can also keep current talking user, calls out other user adding to conversation, and such as B keeps AC, and calling D user adds Three-Way Calling, and ABCD enters MPTY herein.
Particularly, can realize in the following way:
Pass through in AS communication process in first user terminal and one or more second user terminal, when described AS knows that described first user terminal keeps existing call, and described AS receives described first user terminal when carrying the request message of MultiParty Service code, media negotiation is carried out between the 3rd user terminal that described AS makes first user terminal be associated with described request message, thus described 3rd user terminal is added session, and make described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with MRS respectively, thus set up described first user terminal, MPTY between all second user terminals and the 3rd user terminal, the Media Stream that in communication process, each correspondent sends all sends to other correspondent after MRS audio mixing.
Wherein, above-mentioned first user terminal is the terminal of user A, also can be called user terminal A; Second user terminal is the terminal of user B, also can be called user terminal B; 3rd user terminal is the terminal of user C, also can be called user terminal C.
MultiParty Service code also can be described as and arbitrarily cuts service code, this service code and the 3rd user terminal can be bound by the user of first user terminal, such described request message can be the invitation message (INVITE) of carrying MultiParty Service code, without the need to carrying the 3rd user terminal number; Certainly, also can without the need to binding, like this, request message carries the 3rd user terminal number, and namely described request message is the invitation message of carrying MultiParty Service code and the 3rd user terminal number.
In addition, after described AS makes to carry out media negotiation between first user terminal and the 3rd user terminal, also send releasing request (BYE), to terminate the session between described first user terminal and all second user terminals to described first user terminal.
Described AS makes to carry out media negotiation between first user terminal and the 3rd user terminal and realizes especially by such as under type: as described in AS obtain as described in the media information of first user terminal, send to the 3rd user terminal, obtain the media information stating the 3rd user terminal, send to described first user terminal.
Described AS makes described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation respectively with MRS to realize especially by such as under type: as described in AS respectively the media information of first user terminal, all second user terminals and the 3rd user terminal as described in obtaining is sent to MRS, the media information of MRS is sent to respectively described first user terminal, the second user terminal and the 3rd user terminal.
Correspondingly, the MultiParty Service of the embodiment of the present invention realize system, be applied to AS, comprise MPTY trigger module and media negotiation module, wherein,
Described MPTY trigger module is used for, when knowing that first user terminal and one or more second user terminal first user terminal described in communication process keep existing call, and, receive described first user terminal when carrying the request message of MultiParty Service code, notify described media negotiation module;
Described media negotiation module is used for, according to the notice of described MPTY trigger module, media negotiation is carried out between the 3rd user terminal that first user terminal is associated with described request message, and make described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with MRS respectively, thus set up described first user terminal, MPTY between all second user terminals and the 3rd user terminal.
Said system also can comprise release module,
Described release module is used for, after described media negotiation module makes to carry out media negotiation between first user terminal and the 3rd user terminal, releasing request is sent, to terminate the session between described first user terminal and all second user terminals to described first user terminal.
Described media negotiation module can be further used for, when making to carry out media negotiation between first user terminal and the 3rd user terminal, obtain the media information of described first user terminal, send to the 3rd user terminal, obtain the media information stating the 3rd user terminal, send to described first user terminal.
Described media negotiation module can be further used for, when making described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with MRS respectively, respectively the media information obtaining described first user terminal, all second user terminals and the 3rd user terminal is sent to MRS, the media information of MRS is sent to respectively described first user terminal, the second user terminal and the 3rd user terminal.
Below based on IMS or NGN (next generation network, Next Generation Network) network, the present invention is described in further detail.
As shown in Figure 2, the Network Element Function of application example of the present invention is explained as follows:
User terminal (User Equipment is called for short UE): user makes a call, answer the call and do the device of other call operations, as cdma network or GSM network mobile phone, PSTN terminal, IMS terminal etc.
Arbitrarily cut application server (Random Switch Application Server is called for short RS AS): provide bottom arbitrarily to cut professional ability, as: Call-Control1, state reporting, the functions such as ticket generation.
Media Resource Server (Media Resource Server, be called for short MRS): voice medium ability is provided, be generally media server (Media Server, i.e. MS), keep prompt tone, MPTY audio mixing etc. as play calling to the side of being kept user in calling keep-process.
Use agreement as follows in concrete network element:
RS AS is with the media negotiation between MRS or UE being call conversation, RS AS and UE uses SIP (Session Initiation Protocol by core net, session initiation protocol) intercommunication, RS AS uses Session Initiation Protocol or MGCP (Media Gateway Control Protocol usually with between MRS, MGCP), the protocol type that concrete decision is supported in MRS.
UE is with the transmission between MRS being Media Stream (media data), and the code/decode format of the concrete media bag of UE and MRS, transmitting-receiving port, bandwidth for transmission speed etc., can according to when calling out, and terminal is carried out with the media negotiation between MRS.
It should be noted that the diagram of a just summary in Fig. 2, conceal IMS or NGN network topology structure, in actual realization, RS AS, MRS and UE are accesses or anchor in IMS network or NGN network.
Below to add access customer C in user AB communication process, enter Three-Way Calling, then user A on-hook, it is that example is described that A is added Three-Way Calling by user C again, wherein, specific implementation flow process as shown in Figure 3,
Step 1, user A arbitrarily cuts service-user, is in call with user B, and user A can be caller also can be called.
Step 2, user A keeps user B, and user B listens calling to keep prompt tone.
Step 3, user A dials arbitrarily to cut service code or arbitrarily cut service code and adds assigned number, gives RSAS.
Step 4, the user bound of RS AS calling party A or designated user, be labeled as user C, user C off-hook.
Step 5, user A, B, C are consulted media with MRS by RS AS respectively, namely use the mode of media server audio mixing to realize ABC Three-Way Calling.
Step 6, if user A on-hook and C wants that rejoining user A enters Three-Way Calling, then return step 1, wherein the role exchange of user A and user C.
As the concrete signaling process figure that Fig. 4 is Fig. 3, comprising:
Step 401, UE A makes a call request INVITE (invitations) to RS AS, and carries some information of calling out, as arbitrarily cut service code or arbitrarily cutting the media information etc. that service code adds assigned number, UE A.
Step 402, RS AS sends INVITE request to UE C, and carries the media information of UE A.
Step 403, UE C returns 180 responses of INVITE to RS AS.
Step 404, RS AS returns 180 responses of INVITE to UE A.
Step 405, UE C returns the 200OK response of INVITE to RS AS, carries the media information of UE C.
Step 406, RS AS returns the 200OK response of INVITE to UE A, carries the media information of UE C.
Step 407, UE A sends ACK confirmation to RS AS.
Step 408, RS AS sends ACK confirmation to UE C.UE A and UE C completes media negotiation.
Step 409, RS AS sends REINVITE request to UE C, does not carry media information.
Step 410, UE C returns the 200OK response of REINVITE to RS AS, carries the media information of UE C.
Step 411, RS AS initiates INVITE request to MRS, carries the media information of UE C.
Step 412, MRS returns the 200OK response of INVITE to RS AS, carries the media information of MRS.
Step 413, RS AS sends ACK confirmation to MRS.
Step 414, RS AS sends ACK confirmation to UE C, carries the media information of MRS.UE C and MRS completes media negotiation.
Step 415, RS AS sends REINVITE request to UE B, does not carry media information.
Step 416, UE B returns the 200OK response of REINVITE to RS AS, carries the media information of UE B.
Step 417, RS AS initiates INVITE request to MRS, carries the media information of UE B.
Step 418, MRS returns the 200OK response of INVITE to RS AS, carries the media information of MRS.
Step 419, RS AS sends ACK confirmation to MRS.
Step 420, RS AS sends ACK confirmation to UE B, carries MRS media information.UE B and MRS completes media negotiation, wherein the media of MRS to be media be Three-Way Calling audio mixing.
Step 421, RS AS sends BYE request (releasing request) to UE A, terminates the call of UE A and UE B.
Step 422, UE A returns the 200OK response of BYE to RS AS.
Step 423, RS AS sends REINVITE request to UE A, does not carry media information.
Step 424, UE A returns the 200OK response of REINVITE to RS AS, carries the media information of UE A.
Step 425, RS AS initiates INVITE request to MRS, carries the media information of UE A.
Step 426, MRS returns the 200OK response of INVITE to RS AS, carries the media information of MRS.
Step 427, RS AS sends ACK confirmation to MRS.UE A and MRS completes media negotiation.
Step 428, RS AS sends ACK confirmation to UE A, carries the media information of MRS.UE A and MRS completes media negotiation, wherein the media of MRS to be media be Three-Way Calling audio mixing.
Now, ABC enters Three-Way Calling, and media stream is all carried out audio mixing to MRS, MRS by each party of call, sends to other correspondent.In above-mentioned flow process, because the media stream of A and B call maintenance B, Three-Way Calling is prior art, so do not describe in detail.
When A on-hook, after BC call, C keeps B, and is added by A and with reference to above-mentioned flow process, just can be exchanged by AC.
In sum, the Three-Way Calling that the present invention proposes the arbitrarily business of cutting belongs to a kind of B2B (back-to-back type) and calls out class service, arbitrarily cut user's communication information by application server AS record, terminal is not needed to support sound mixing function, terminal is not needed to support refer message yet, only need to dial specific service code or service code to add assigned number and just can realize Three-Way Calling, Three-Way Calling arbitrarily cuts the random switching of business realizing Three-Way Calling founder and Contributor role simultaneously, has broad application prospects.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize, and correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. an implementation method for MultiParty Service, comprising:
Pass through in application server (AS) communication process in first user terminal and one or more second user terminal, when described AS knows that described first user terminal keeps existing call, and described AS receives described first user terminal when carrying the request message of MultiParty Service code, media negotiation is carried out between the 3rd user terminal that described AS makes first user terminal be associated with described request message, and make described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with Media Resource Server (MRS) respectively, thus set up described first user terminal, MPTY between all second user terminals and the 3rd user terminal, the Media Stream that in communication process, each correspondent sends all sends to other correspondent after MRS audio mixing,
The step that described AS makes described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with MRS respectively comprises:
The media information obtaining described first user terminal, all second user terminals and the 3rd user terminal is sent to MRS by described AS respectively, the media information of MRS is sent to respectively described first user terminal, the second user terminal and the 3rd user terminal.
2. the method for claim 1, is characterized in that,
Described request message is carry the invitation message of MultiParty Service code or carry the invitation message of MultiParty Service code and the 3rd user terminal number.
3. the method for claim 1, is characterized in that,
After described AS makes to carry out media negotiation between first user terminal and the 3rd user terminal, also send releasing request, to terminate the session between described first user terminal and all second user terminals to described first user terminal.
4., as the method in claims 1 to 3 as described in any one, it is characterized in that,
Described AS makes the step of carrying out media negotiation between first user terminal and the 3rd user terminal comprise:
Described AS obtains the media information of described first user terminal, sends to the 3rd user terminal, obtains the media information stating the 3rd user terminal, sends to described first user terminal.
5. MultiParty Service realize a system, be applied to AS, it is characterized in that, comprise MPTY trigger module and media negotiation module, wherein,
Described MPTY trigger module is used for, when knowing that first user terminal and one or more second user terminal first user terminal described in communication process keep existing call, and, receive described first user terminal when carrying the request message of MultiParty Service code, notify described media negotiation module;
Described media negotiation module is used for, according to the notice of described MPTY trigger module, media negotiation is carried out between the 3rd user terminal that first user terminal is associated with described request message, and make described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with MRS respectively, thus set up described first user terminal, MPTY between all second user terminals and the 3rd user terminal;
Described media negotiation module is further used for, when making described first user terminal, all second user terminals and the 3rd user terminal carry out media negotiation with MRS respectively, respectively the media information obtaining described first user terminal, all second user terminals and the 3rd user terminal is sent to MRS, the media information of MRS is sent to respectively described first user terminal, the second user terminal and the 3rd user terminal.
6. system as claimed in claim 5, is characterized in that,
Described request message is carry the invitation message of MultiParty Service code or carry the invitation message of MultiParty Service code and the 3rd user terminal number.
7. system as claimed in claim 5, is characterized in that, also comprise release module,
Described release module is used for, after described media negotiation module makes to carry out media negotiation between first user terminal and the 3rd user terminal, releasing request is sent, to terminate the session between described first user terminal and all second user terminals to described first user terminal.
8., as the system in claim 5-7 as described in any one, it is characterized in that,
Described media negotiation module is further used for, when making to carry out media negotiation between first user terminal and the 3rd user terminal, obtain the media information of described first user terminal, send to the 3rd user terminal, obtain the media information stating the 3rd user terminal, send to described first user terminal.
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| CN201110042644.3A CN102123211B (en) | 2011-02-22 | 2011-02-22 | Realizing method and system of multi-party calling service |
| PCT/CN2011/076366 WO2012113193A1 (en) | 2011-02-22 | 2011-06-27 | Method and system for implementing multiparty call service |
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| CN102316228B (en) * | 2011-09-21 | 2017-06-27 | 中兴通讯股份有限公司 | The methods, devices and systems of attendant intrusion call are realized in central office service |
| CN102387259A (en) * | 2011-10-20 | 2012-03-21 | 中兴通讯股份有限公司 | Method, system and device for monitoring call of intra-group subscribers by telephone operator |
| WO2017173634A1 (en) * | 2016-04-07 | 2017-10-12 | 华为技术有限公司 | User equipment and method and apparatus for sharing conversation content |
| CN106506885A (en) * | 2016-09-24 | 2017-03-15 | 深圳市潮流网络技术有限公司 | A kind of unaware call transfer method |
| CN108270585A (en) * | 2016-12-30 | 2018-07-10 | 展讯通信（上海）有限公司 | Establish more method, apparatus talked about all, mostly logical terminal and network side equipment |
| CN108540678A (en) * | 2017-03-03 | 2018-09-14 | 展讯通信（上海）有限公司 | Conference telephone implementation method, device and mostly logical terminal |
| CN109005141B (en) * | 2017-06-06 | 2021-04-23 | 展讯通信(天津)有限公司 | IMS-based session processing method and device and electronic equipment |
| CN108512826A (en) * | 2018-02-05 | 2018-09-07 | 惠州Tcl移动通信有限公司 | phone sharing method, terminal device and computer readable storage medium |
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| CN101291373A (en) * | 2008-04-15 | 2008-10-22 | 中兴通讯股份有限公司 | Method and system realizing multi-party communication |
| CN101389077A (en) * | 2008-10-24 | 2009-03-18 | 华为技术有限公司 | Method, apparatus and system for call switching |
| CN101854248A (en) * | 2010-06-17 | 2010-10-06 | 中兴通讯股份有限公司 | Method and system for realizing multi-party conference service |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102123211A (en) | 2011-07-13 |
| WO2012113193A1 (en) | 2012-08-30 |
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