CN102123211B - Realizing method and system of multi-party calling service - Google Patents

Abstract

The present invention discloses a method and system for implementing a multi-party call service, wherein the method includes: during a call between a first user terminal and one or more second user terminals through an AS, when the AS learns that the first user terminal When the existing call is maintained, and the AS receives a request message carrying a multi-party call service code from the first user terminal, the AS enables media negotiation between the first user terminal and a third user terminal associated with the request message, and enabling the first user terminal, all second user terminals, and third user terminals to perform media negotiation with the MRS, so as to establish a multiparty call between the first user terminal, all second user terminals, and third user terminals, During the call, the media stream sent by each caller is mixed by MRS and then sent to other callers. The present invention has nothing to do with the terminal, supports various terminals in the existing network, and can realize the arbitrary switching of the roles of the creator and the participant of the three-party call.

Description

Method and system for realizing multi-party call service

technical field

The present invention relates to the communication field, in particular to a method and system for realizing a multi-party call service.

Background technique

Multi-party call service is also called three-party call service or conference call, which is a new service based on call waiting and hold.

The existing multi-party call service is realized through terminal mixing or network mixing. If the terminal mixing method is used, the terminal is required to have the ability to mix multiple calls, and the general terminal does not have such a function; In the case of network mixing, it is usually implemented by sending a refer (indication) message from the terminal. As shown in FIG. UE-B) During the call, A holds the call with B, then establishes a call between A and C, A holds the call with C, and then uses the refer message to establish a new call In the session, the application server (AS) adds ABC to the session, performs audio mixing through the media resource server (MRS), and ends the original call between A and B, and between A and C.

However, it is generally a relatively high-end terminal that has the ability to send refer messages, and ordinary terminals usually do not have this capability. How to enable the common terminal to have a multi-party call function during a call is an urgent problem to be solved.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art, and propose a method and system for realizing a multi-party call service, so as to solve the problem of how to enable an ordinary terminal to have a multi-party call function during a call.

In order to solve the above problems, the present invention provides a method for implementing a multi-party call service, including:

During a call between a first user terminal and one or more second user terminals through an AS, when the AS learns that the first user terminal maintains the existing call, and the AS receives that the first user terminal carries a multi-party When calling a service code request message, the AS enables media negotiation between the first user terminal and the third user terminal associated with the request message, and makes the first user terminal, all second user terminals, and the third user terminal The three user terminals perform media negotiation with the MRS respectively, thereby establishing a multi-party call among the first user terminal, all second user terminals, and the third user terminal. After the tone is sent to other callers.

Preferably, the above method has the following characteristics:

The request message is an invitation message carrying a multi-party call service code or an invitation message carrying a multi-party call service code and a third user terminal number.

Preferably, the above method has the following characteristics:

After the AS enables the media negotiation between the first user terminal and the third user terminal, it also sends a release request to the first user terminal to end the sessions between the first user terminal and all second user terminals .

Preferably, the above method has the following characteristics:

The step of the AS enabling the media negotiation between the first user terminal and the third user terminal includes:

The AS obtains the media information of the first user terminal and sends it to a third user terminal, obtains the media information of the third user terminal and sends it to the first user terminal.

Preferably, the above method has the following characteristics:

The step of the AS enabling the first user terminal, all second user terminals and third user terminals to perform media negotiation with the MRS respectively includes:

The AS respectively sends the acquired media information of the first user terminal, all second user terminals, and the third user terminal to the MRS, and sends the media information of the MRS to the first user terminal, the second user terminal, and the a third user terminal.

In order to solve the above problems, the present invention provides a multi-party call service implementation system, which is applied to AS, including a multi-party call trigger module and a media negotiation module, wherein,

The multi-party call triggering module is configured to, when it is known that the first user terminal maintains an existing call during the call with one or more second user terminals, and receives the information carried by the first user terminal. When requesting a multi-party call service code message, notify the media negotiation module;

The media negotiation module is configured to, according to the notification of the multi-party call triggering module, enable media negotiation between the first user terminal and the third user terminal associated with the request message, and enable the first user terminal, All the second user terminals and the third user terminals perform media negotiation with the MRS respectively, so as to establish a multi-party call among the first user terminal, all the second user terminals and the third user terminals.

Preferably, the above system has the following characteristics:

The request message is an invitation message carrying a multi-party call service code or an invitation message carrying a multi-party call service code and a third user terminal number.

Preferably, the above system also includes a release module,

The release module is configured to send a release request to the first user terminal after the media negotiation module performs media negotiation between the first user terminal and the third user terminal, so as to end the communication between the first user terminal and the third user terminal. All sessions between the second user terminals.

Preferably, the above system has the following characteristics:

The media negotiation module is further configured to obtain the media information of the first user terminal and send it to the third user terminal during media negotiation between the first user terminal and the third user terminal, and obtain the media information of the third user terminal The media information is sent to the first user terminal.

Preferably, the above system has the following characteristics:

The media negotiation module is further configured to, when the first user terminal, all second user terminals, and third user terminals perform media negotiation with the MRS, respectively obtain the first user terminal, all second user terminals and the media information of the third user terminal to the MRS, and respectively send the media information of the MRS to the first user terminal, the second user terminal and the third user terminal.

The present invention has nothing to do with terminals, and supports various types of terminals in the existing network, such as supporting CDMA (Code Division Multiple Access) networks or GSM (Global System for Mobile Communications, Global System for Mobile Communications) network mobile phones, PSTN (Public Switched Telephone Network (Public Switched Telephone Network) terminals, IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) terminals, etc.; terminals are not required to support the audio mixing function, nor are terminals required to support the ability to send refer messages, all types of terminals on the existing network are acceptable Operation; it can realize the free switching of the role of creator and participant of the three-party call. And along with the rise of 3G network, the fusion of CS (voice service) and PS (data service) network makes the present invention have very wide development and use space.

Description of drawings

FIG. 1 is a schematic flow diagram of implementing a three-party call using a refer message in the prior art;

Fig. 2 is a network element structure diagram of an application example of the present invention;

Fig. 3 is the flowchart of application example of the present invention;

Fig. 4 is a specific signaling flow chart of an application example of the present invention.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

The basic idea of the present invention is to provide a three-party call switching service at will. The service is that user A maintains user B during the call with user B, and calls user C by dialing the service code or the service code plus a specified number. After off-hook, ABC enters into the three-party call. If one of the users hangs up, other users can continue the call. For example, user A hangs up, and BC can continue the call. At this time, user B or C can keep the current call, dial the service code or the service code plus the specified number, and call other users for business, such as User C holds user B, dials the service code or the service code plus a specified number, and makes a business call to user A. After user A picks up the phone, ABC enters the three-way call, realizing the free switching between the creator and participant roles of the three-way call. In addition, when ABC enters the three-party call, the user of the three-party call can also maintain the current call user and call other users to join the session. For example, B keeps AC and calls D user to join the three-party call, where ABCD enters the multi-party call.

Specifically, it can be implemented in the following ways:

During a call between a first user terminal and one or more second user terminals through an AS, when the AS learns that the first user terminal maintains the existing call, and the AS receives that the first user terminal carries a multi-party When calling a request message of a service code, the AS enables media negotiation between the first user terminal and the third user terminal associated with the request message, thereby adding the third user terminal to the session, and making the third user terminal A user terminal, all second user terminals, and third user terminals perform media negotiation with the MRS respectively, so as to establish a multi-party call among the first user terminal, all second user terminals, and third user terminals, and each The media stream sent by one party is mixed by MRS and then sent to other parties.

Wherein, the above-mentioned first user terminal is a terminal of user A, and may also be called user terminal A; the second user terminal is a terminal of user B, and may also be called user terminal B; the third user terminal is a terminal of user C, and may also be called user terminal A. It may be called user terminal C.

The multi-party call service code can also be called a random switch service code, and the user of the first user terminal can bind the service code with the third user terminal, so that the request message can be an invitation message (INVITE) carrying the multi-party call service code , does not need to carry the third user terminal number; of course, it may not need to be bound, so that the request message carries the third user terminal number, that is, the request message is an invitation message carrying the multi-party call service code and the third user terminal number.

In addition, after the AS enables media negotiation between the first user terminal and the third user terminal, it also sends a release request (BYE) to the first user terminal to end the communication between the first user terminal and all second user terminals. Sessions between terminals.

The AS enables the media negotiation between the first user terminal and the third user terminal to be specifically implemented in the following manner: the AS obtains the media information of the first user terminal, sends it to the third user terminal, and obtains the media information of the third user terminal The media information of the terminal is sent to the first user terminal.

The AS enables the first user terminal, all second user terminals, and third user terminals to perform media negotiation with the MRS respectively in the following manner: the AS respectively obtains the first user terminal, all second user terminals Send the media information of the terminal and the third user terminal to the MRS, and send the media information of the MRS to the first user terminal, the second user terminal, and the third user terminal respectively.

Correspondingly, the implementation system of the multi-party call service in the embodiment of the present invention is applied to an AS, and includes a multi-party call trigger module and a media negotiation module, wherein,

The multi-party call triggering module is configured to, when it is known that the first user terminal maintains an existing call during the call with one or more second user terminals, and receives the information carried by the first user terminal. When requesting a multi-party call service code message, notify the media negotiation module;

The media negotiation module is configured to, according to the notification of the multi-party call triggering module, enable media negotiation between the first user terminal and the third user terminal associated with the request message, and enable the first user terminal, All the second user terminals and the third user terminals perform media negotiation with the MRS respectively, so as to establish a multi-party call among the first user terminal, all the second user terminals and the third user terminals.

The above system may also include a release module,

The release module is configured to send a release request to the first user terminal after the media negotiation module performs media negotiation between the first user terminal and the third user terminal, so as to end the communication between the first user terminal and the third user terminal. All sessions between the second user terminals.

The media negotiation module may be further configured to obtain the media information of the first user terminal and send it to the third user terminal during media negotiation between the first user terminal and the third user terminal, and obtain the media information of the third user terminal. The media information of the terminal is sent to the first user terminal.

The media negotiation module may be further configured to enable the first user terminal, all second user terminals, and third user terminals to obtain the first user terminal, all second user terminals, and Send the media information of the terminal and the third user terminal to the MRS, and send the media information of the MRS to the first user terminal, the second user terminal, and the third user terminal respectively.

The present invention will be further described in detail below based on IMS or NGN (Next Generation Network, Next Generation Network) network.

As shown in Figure 2, the network element function of the application example of the present invention is described as follows:

User Equipment (UE for short): A device for users to initiate calls, answer calls, and perform other call operations, such as CDMA network or GSM network mobile phones, PSTN terminals, IMS terminals, etc.

Random Switch Application Server (RS AS for short): Provides the underlying random switch service capabilities, such as: call control, status reporting, bill generation and other functions.

Media Resource Server (MRS for short): Provides voice media capabilities, generally a Media Server (MS), such as playing call holding prompts and multi-party call mixing to the held party user during the call holding process wait.

The protocols used in specific network elements are as follows:

Media negotiation between RS AS and MRS or UE for call communication, RS AS and UE use SIP (Session Initiation Protocol, Session Initiation Protocol) intercommunication through the core network, RS AS and MRS usually use SIP protocol or MGCP (Media Gateway Control Protocol, media gateway control protocol), which depends on the type of protocol supported by the MRS.

The transmission of media stream (media data) between the UE and the MRS, the codec format of the specific media packets between the UE and the MRS, the transceiver port, the bandwidth transmission rate, etc., can be carried out according to the media negotiation between the terminal and the MRS during the call.

It should be noted that Figure 2 is only a schematic illustration, which hides the IMS or NGN network topology. In actual implementation, RS AS, MRS and UE are connected or anchored to the IMS network or NGN network.

In the following, user A joins user C during a call, enters a three-party call, then user A hangs up, and user C adds A to the three-party call as an example. The specific implementation process is shown in Figure 3.

Step 1. User A is a user who can switch services at will, and is in a call with user B. User A can be the calling party or the called party.

Step 2: User A puts user B on hold, and user B listens to the call hold prompt tone.

Step 3: User A dials the free switch service code or the random switch service code plus a specified number, and sends it to RSAS.

Step 4, RS AS calls the bound user or designated user of user A, marks it as user C, and user C goes off-hook.

Step 5: RS AS negotiates media with users A, B, and C respectively with MRS, that is, uses the media server to mix audio to realize ABC three-way conversation.

Step 6, if user A hangs up and C wants to rejoin user A to enter the three-party call, return to step 1, where user A and user C switch roles.

Figure 4 is a specific signaling flow chart of Figure 3, including:

Step 401, UE A initiates a call request INVITE (invitation) to RS AS, and carries some call information, such as a random switch service code or a random switch service code plus a specified number, UE A's media information, etc.

Step 402, RS AS sends an INVITE request to UE C, and carries UE A's media information.

Step 403, UE C returns a 180 response of INVITE to RS AS.

In step 404, the RS AS returns a 180 response to INVITE to UE A.

Step 405, UE C returns a 200 OK response to INVITE to RS AS, carrying UE C's media information.

In step 406, the RS AS returns a 200 OK response to INVITE to UE A, carrying the media information of UE C.

Step 407, UE A sends ACK confirmation information to RS AS.

Step 408, RS AS sends ACK confirmation information to UE C. UE A completes media negotiation with UE C.

Step 409, RS AS sends a REINVITE request to UE C without carrying media information.

Step 410, UE C returns a REINVITE 200 OK response to RS AS, carrying UE C's media information.

In step 411, the RS AS initiates an INVITE request to the MRS, carrying UE C's media information.

In step 412, the MRS returns a 200 OK response to the INVITE to the RS AS, carrying the media information of the MRS.

Step 413, the RS AS sends ACK confirmation information to the MRS.

Step 414, the RS AS sends an ACK confirmation message to the UE C, carrying the media information of the MRS. UE C completes media negotiation with MRS.

Step 415, RS AS sends a REINVITE request to UE B without carrying media information.

Step 416, UE B returns a REINVITE 200 OK response to RS AS, carrying UE B's media information.

In step 417, the RS AS initiates an INVITE request to the MRS, carrying UE B's media information.

In step 418, the MRS returns a 200 OK response to the INVITE to the RS AS, carrying the media information of the MRS.

Step 419, the RS AS sends ACK confirmation information to the MRS.

Step 420, RS AS sends ACK confirmation information to UE B, carrying MRS media information. UE B completes the media negotiation with MRS, where MRS is the media that is the mixed audio of the three-party call.

Step 421, the RS AS sends a BYE request (release request) to UE A, ending the call between UE A and UE B.

Step 422, UE A returns a BYE 200OK response to RS AS.

Step 423, RS AS sends a REINVITE request to UE A without carrying media information.

Step 424, UE A returns a REINVITE 200 OK response to RS AS, carrying UE A's media information.

Step 425, the RS AS initiates an INVITE request to the MRS, carrying UE A's media information.

In step 426, the MRS returns a 200 OK response to the INVITE to the RS AS, carrying the media information of the MRS.

Step 427, the RS AS sends ACK confirmation information to the MRS. UE A completes media negotiation with MRS.

Step 428, RS AS sends ACK confirmation information to UE A, carrying the media information of MRS. UE A completes the media negotiation with MRS, where MRS is the media that is the mixed audio of the three-party call.

At this point, ABC enters into a three-party call, and each party in the call sends the media stream to the MRS, and the MRS mixes the audio and sends it to the other callers. In the above process, since the communication between A and B is maintained by B, and the media stream transmission of the three-party call is in the prior art, it is not described in detail.

When A hangs up and BC talks, C keeps B and adds A. You can refer to the above process, just swap AC.

To sum up, the three-party call free switching service proposed by the present invention belongs to a B2B (back-to-back) call service, and the application server AS records the call information of the user for free switching, and does not require the terminal to support the audio mixing function, and does not need the terminal Support refer message, only need to dial a specific service code or service code plus a specified number to realize three-way call, and at the same time, the three-party call can be switched at will, which realizes the free switching between the creator and participant roles of the three-way call, which has broad application prospects.

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a magnetic disk or an optical disk, and the like. Optionally, all or part of the steps in the above embodiments can also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiments can be implemented in the form of hardware, or can be implemented in the form of software function modules. The form is realized. The present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. A method for realizing a multi-party call service, comprising: During a call between a first user terminal and one or more second user terminals through an application server (AS), when the AS learns that the first user terminal maintains the existing call, and the AS receives the first When a user terminal carries a request message of a multi-party call service code, the AS enables media negotiation between the first user terminal and the third user terminal associated with the request message, and enables the first user terminal, all second The user terminal and the third user terminal perform media negotiation with the media resource server (MRS) respectively, so as to establish a multi-party call between the first user terminal, all second user terminals, and the third user terminal, and each call during the call The media streams sent by one party are mixed by MRS and then sent to other call parties; The step of the AS enabling the first user terminal, all second user terminals and third user terminals to perform media negotiation with the MRS respectively includes: The AS respectively sends the acquired media information of the first user terminal, all second user terminals, and the third user terminal to the MRS, and sends the media information of the MRS to the first user terminal, the second user terminal, and the a third user terminal. 2. The method of claim 1, wherein The request message is an invitation message carrying a multi-party call service code or an invitation message carrying a multi-party call service code and a third user terminal number. 3. The method of claim 1, wherein, After the AS enables the media negotiation between the first user terminal and the third user terminal, it also sends a release request to the first user terminal to end the sessions between the first user terminal and all second user terminals . 4. The method according to any one of claims 1 to 3, characterized in that, The step of the AS enabling the media negotiation between the first user terminal and the third user terminal includes: The AS obtains the media information of the first user terminal and sends it to a third user terminal, obtains the media information of the third user terminal and sends it to the first user terminal. 5. A system for realizing a multi-party call service, applied to an AS, characterized in that it includes a multi-party call trigger module and a media negotiation module, wherein, The multi-party call triggering module is configured to, when it is known that the first user terminal maintains an existing call during the call with one or more second user terminals, and receives the information carried by the first user terminal. When requesting a multi-party call service code message, notify the media negotiation module; The media negotiation module is configured to, according to the notification of the multi-party call triggering module, enable media negotiation between the first user terminal and the third user terminal associated with the request message, and enable the first user terminal, All the second user terminals and the third user terminals perform media negotiation with the MRS respectively, so as to establish a multi-party conversation between the first user terminal, all the second user terminals and the third user terminal; The media negotiation module is further configured to, when the first user terminal, all second user terminals, and third user terminals perform media negotiation with the MRS, respectively obtain the first user terminal, all second user terminals and the media information of the third user terminal to the MRS, and respectively send the media information of the MRS to the first user terminal, the second user terminal and the third user terminal. 6. The system of claim 5, wherein: The request message is an invitation message carrying a multi-party call service code or an invitation message carrying a multi-party call service code and a third user terminal number. 7. The system of claim 5, further comprising a release module, The release module is configured to send a release request to the first user terminal after the media negotiation module performs media negotiation between the first user terminal and the third user terminal, so as to end the communication between the first user terminal and the third user terminal. All sessions between the second user terminals. 8. The system according to any one of claims 5-7, wherein: The media negotiation module is further configured to obtain the media information of the first user terminal and send it to the third user terminal during media negotiation between the first user terminal and the third user terminal, and obtain the media information of the third user terminal The media information is sent to the first user terminal.