CN1992965B - System for implementing group call service and method for implementing group call service - Google Patents

Abstract

The invention discloses a system and method for realizing group call service, wherein the system includes: a group call register connected to the existing telephone network for storing group information in a large area; a group call switching center connected through the existing telephone network Connected with the group call register, it is used to extract and save the group information belonging to the service area from the group call register to the local by synchronizing with the group call register data, and is also used to combine the group call register to realize the group call switching center initiated call business. In the present invention, because the group call register uniformly stores the group call service information, any group call server can obtain any group information at any time, so that within the service area of any group call server, any group call can be performed. Schedule a group call. The synchronization mechanism between the group call server and the group call register, and the group information request mechanism ensure the real-time and accuracy of group information, and provide more flexible supplementary services for the group call system.

Description

System for realizing group call service and method for realizing group call service

technical field

The invention relates to the telephone network, in particular to the realization of the group call service in the telephone network.

Background technique

There are already many ways to realize dispatching group call service in cellular and public switched telephone networks, some of which require relatively little modification to the existing network.

At present, there is an implementation method, in which a dispatching controller logically located outside the existing telephone network is coupled to the existing telephone network. When an originating communication device wishes to initiate a dispatch or group call, the originating communication device sends a call request to the existing telephone network, including the identification of the originating device and the destination address associated with the dispatch controller. The existing telephone network provides the call request to the identified dispatch controller, which retrieves dispatch related information from a database coupled to the dispatch controller based on the ID or destination address of the originating device. The scheduling related information includes talkgroup affiliation of the originating communication device. Based on the retrieved dispatch-related information, the dispatch controller identifies a group of target communication devices for the dispatch call, and then the dispatch controller generates and sends control signals to the originating communication device and the reorganization target communication devices via the existing telephone network to establish and manage group calls. Establishing a group call in this way allows the dispatch group call service to be added to the existing public telephone network such as the public switched telephone network and the cellular telephone network without the need to improve the existing telephone network.

Although this method can realize dispatching group call service without transforming the existing telephone network, it does not provide a solution for initiating a group call request from a console (such as a computer); Coupled together, when the dispatching group belongs to a non-local service area, there are many restrictions on dialing and routing to realize group calls to this dispatching group. For example, if the group information of the destination group cannot be obtained from the local dispatch database when calling a group in another service area in one service area, additional routing information must be added before the group number so that the call can be routed to the destination group where the dispatch controller is located. In order to make group calls to groups in each service area, it is necessary to assign a special routing number to each service area, and to increase the analysis of these routing numbers in each physical entity passing through the network, and to Existing networks have a greater impact.

Contents of the invention

The purpose of the present invention is to provide a system and a method for realizing group call service, without changing the existing network, provide group call function to the existing network, and provide a solution to initiate a group call request from the console method, and eliminate the restrictions on dialing and routing in group calls whose dispatching group belongs to non-local service areas.

In order to achieve the above object, the present invention provides a system for realizing group call service, including:

Group call register, connected to the existing telephone network, used to save group information in large areas;

The group call switching center is connected to the group call register through the existing telephone network, and is used to extract and save the group information belonging to the service area from the group call register to the local area by synchronizing with the group call register data, and to combine the group call register data. The call register realizes the group call service initiated by the group call switching center;

The group call switching center includes a group call front end, a group call server and a group call dispatching station, wherein:

The group call front-end device is connected to the existing telephone network through the NO.7 signaling method, and is used to complete the group call switching function;

The group call server is connected with the group call front-end device, and is used to synchronize the data of the group call front-end device with the group call register, extract and save the group information belonging to the service area from the group call register to the local, and manage the group call Dispatcher;

The group call dispatching station is connected with the group call front-end device, and is used to directly initiate a group call in combination with the group call server and the group call front-end device, and modify the group information.

Further, the present invention also includes the following features: the group call front end is connected with the group call server and the group call dispatching station through TCP/IP mode.

The present invention also provides a method for realizing the group call service, including:

In the data synchronization step, the group call switching center extracts the group information belonging to the service area from the group call register to the local and saves it by synchronizing with the group call register data;

Group call realization step, the group call switching center realizes the group call service initiated by the group call switching center in combination with the group call register;

The group call switching center includes a group call front end, a group call server and a group call dispatching station, wherein:

The group call front end is connected to the existing telephone network through the No. 7 signaling mode, and is used to complete the group call switching function;

The group call server is connected with the group call front-end device, and is used for synchronizing the group call front-end device with the group call register data, extracting and saving the group information belonging to the service area from the group call register to the local, and managing Group call dispatcher;

The group call dispatching station is connected with the group call front-end device, and is used to directly initiate a group call in combination with the group call server and the group call front-end device, and modify the group information;

When the group call dispatcher in the group call switching center initiates a group call, the group call realization steps specifically include:

Step 401, the group call dispatcher sends a group call request message from the group call dispatcher to the group call server to which it belongs, with the group number and corresponding group information in the message;

Step 402, the group call server forwards the group call dispatcher group call request message to the group call front end;

Step 403, judge whether there is the group information of designated group number in the group call request message of group call dispatching station, if directly execute step 405, otherwise group call front end sends group information request message to group call register, requests the group information of designated group number group information;

Step 404, the group call register searches for the group information of the corresponding group according to the group number, returns a message through the group information, and returns the group information of the specified group number to the group call front-end device;

Step 405, the group call front-end device initiates a call to the members in the group according to the group information;

Step 406, any member rings to answer, and the group call front end sends the current user's ringing notification message to the group call server;

Step 407, the group call server forwards the ringing notification message to the group call dispatcher;

Step 408, any member goes off-hook to answer, and the group call front-end device sends the current user's answer notification message to the group call server;

Step 409, the group call server forwards the response notification message to the group call dispatcher.

Further, the present invention also includes the following features: the group call switching center includes a group call front-end processor, a group call server, and a group call dispatcher, and the data synchronization step specifically includes the following steps:

Step 201, the group call server sends a local group information request message to the group call front end;

Step 202, after receiving the local group information request message, the group call front-end device forwards it to the group call register to which it belongs, and the local group information request message carries information identifying the identity of the local end;

Step 203, after the group call register receives the local group information request message, find out the group information belonging to the group call server according to the information identifying the identity of the local end, and send the group call front-end processor through the local group information return message;

Step 204, after receiving the local group information return message of the group call register, the group call front-end processor forwards it to the group call server;

Step 205, after receiving the local group information return message, the group call server stores the group information therein.

Further, the present invention also includes the following features: when the terminal initiates a group call, the step of realizing the group call specifically includes:

Step 301, the terminal dials and sends a request message to initiate a group call to PSTN/PLMN;

Step 302, the PSTN/PLMN routes the call to the group call front end of the visited location according to the called number;

Step 303, after the group call front-end processor obtains the group number of the group call according to the called number analysis, it sends a group information request message to the group call register at the place where the group belongs to request the group information of this group, and the group information request message includes The group number with the group call;

Step 304, after the group call register receives the group information request message, it searches for the corresponding group information according to the group number, and returns the group information of the group to the group call front-end device through the group information return message;

Step 305, after receiving the group information return message, the group call front-end device initiates a call to all members according to the member information in the group;

Step 306, after the first member in the group rings and responds, the group call front end sends a ringing response message to the PLMN/PSTN;

Step 307, PLMN/PSTN forwards the ringing response message to the calling terminal;

Step 308, after the first member in the group goes off-hook to answer, the group call front end returns an off-hook answer message to the PLMN/PSTN;

In step 309, the PLMN/PSTN forwards the off-hook response message to the calling terminal.

Further, the present invention also includes the following features: during the group call process, it also includes the step of dynamically adding call members, specifically including:

Step 601, the terminal sends a request message for dynamically adding call members to the group call front-end through the PLMN/PSTN, including the current group number and the number of the new member;

In step 602, the group call front end initiates a call to the new member, establishes a conversation with the new member, and does not send called ringing and answer messages to the terminal.

Further, the present invention also includes the following features: during the group call process, it also includes the step of dynamically deleting the call member, specifically including:

Step 701, the terminal sends a request message for dynamically deleting call members to the group call front-end through the PLMN/PSTN, including the current group number and the member number to be deleted;

Step 702, the group call front-end extracts the member number in the request message, searches for the call corresponding to the specified member in the current group call process, and if found, terminates the corresponding call; otherwise, ignores the request.

Further, the present invention also includes the following features: during the group call process, it also includes the step of dynamically adding call members, specifically including:

Step 801, the group call dispatching station sends a group call dispatching station to add a call member request message to the group call front end through the group call server, including the current group number and the number of the new member;

Step 802, the group call server sends back a response message of group call dispatcher adding call members to the group call dispatcher;

Step 803, the group call front end initiates a call to the new member;

Step 804, the new member rings, the group call front-end device sends a ringing message to the group call server, and the group call server sends a ringing notification message to the group call dispatcher;

Step 805, the new member answers, the group call front end sends a response message to the group call server, and the group call server sends a response notification message to the group call dispatcher.

Further, the present invention also includes the following features: during the group call process, it also includes the step of dynamically deleting the call member, specifically including:

Step 901, during the group call process, the group call dispatching station sends a group call dispatching station deletion call member request message to the group call front-end device through the group call server, including the current group number and the member number to be deleted;

Step 902, the group call server sends back a response message to the group call dispatcher to delete the call member by the group call dispatcher;

Step 903, the group call front-end device extracts the member number in the request message, searches for the call corresponding to the specified member in the current group call process, if found, terminates the corresponding call, and sends a release notification message to the group call server; otherwise, ignore this requests.

Further, the present invention also includes the following features: the group information includes but not limited to the following information: access numbers of all members of the group, member attributes and member rights.

Further, the present invention also includes the following features: it also includes a step for the group call dispatcher to modify the group information, specifically including:

Step 501, the group call dispatcher modifies the group information of the specified group number, and sends a group information modification request message to the group call front-end processor through the group call server;

Step 502, the group call front-end device sends a group modification request message to the group call register, requiring the group call register to modify the group information of the corresponding group;

Step 503, after the group call register receives the group information modification request message, modify the group information of the specified group number, and then send a group modification response message to the group call front-end;

Step 504, the group call front-end processor receives the group modification response message from the group call register, and sends the group information modification response message to the group call dispatcher through the group call server.

Further, the present invention also includes the following features: the group information modification request message includes but not limited to the following information: group number, group member access number, group member attribute and group member authority.

The present invention provides a detailed solution for the group call initiated by the network control center from the console, and the unified realization of the group call within a large area (for example, within a country). The group call register uniformly saves group call service information so that any group call server can obtain any group information at any time, so that any group call can be scheduled for any group within the service area of any group call server. The synchronization mechanism between the group call server and the group call register, and the group information request mechanism ensure the real-time and accuracy of the group information. At the same time, the dynamic addition and deletion mechanism provides more flexible supplementary services for the group call system.

Description of drawings

Fig. 1 is the structural representation of the system realizing the group call service of the present invention;

Fig. 2 is the flow chart that group call server and group call register carry out data synchronization;

FIG. 3 is a schematic flow diagram of a terminal initiating a group call;

Fig. 4 is the schematic flow chart of group call dispatching station initiating group call;

Fig. 5 is a schematic flow diagram of modifying group information by the group call dispatching station;

FIG. 6 is a schematic flow diagram of a terminal dynamically adding call members during a group call;

FIG. 7 is a schematic flow diagram of dynamically deleting call members during a group call by a terminal;

Fig. 8 is a schematic flow diagram of a group call dispatching station dynamically adding call members during a group call call;

FIG. 9 is a schematic flow diagram of a group call dispatcher dynamically deleting call members during a group call call.

Detailed ways

FIG. 1 is a schematic structural diagram of a system for realizing a group call service according to the present invention.

The present invention adds group call switching center 10 and group call register 20 in existing telephone network, and group call switching center 10 comprises group call front-end processor 101, group call server 102 and group call dispatcher 103, wherein:

The group call front-end processor 101 is connected to the live network through NO.7 mode, and is used to complete the group call switching function;

The group call server 102 is used to save the group information belonging to the local service area and manage the group call dispatcher 103;

Group call dispatching station 103, used for initiating group calls through the computer monitoring station, and modifying group information, etc.;

Group call server 102 performs data synchronization through group call front-end processor 101 and group call register 103. 101 may be a mobile switching center physically;

The group call register 20 saves the group information of a large area, and is connected with the existing telephone network through the NO.7 mode. A large area is a collection of several group call server service areas, for example, a country.

Fig. 2 is the flow chart that group call server and group call register carry out data synchronization, comprises the following steps:

Step 201, the group call server needs to read the group information of the service area from the group call register when it is powered on, or manually operated, or triggered by timing, or other needs, and the group call server sends a local group information request message to the group call front machine;

Step 202, after receiving the local group information request message, the group call front-end device forwards the local group information request message to the group call register to which it belongs, and the message carries information identifying the identity of the local end, such as the switch identification;

Step 203, after the group call register receives the local group information request message, it searches the database according to the local identity information in the message, finds out the group information belonging to the group call server, and sends it to the group call server through the local group information return message. Front-end machine;

Step 204, after receiving the local group information return message of the group call register, the group call front-end processor forwards it to the group call server;

Step 205, after receiving the local group information return message, the group call server stores the group information therein.

Through the process of data synchronization, the group call server extracts the group information belonging to the service area from the group call register to the local, so that when the group call dispatcher initiates a group call request, it can directly extract the group information from the group call server to which it belongs , eliminating the need to interact with the group call register.

Fig. 3 is a schematic flow diagram of a terminal initiating a group call, including the following steps:

Step 301, the terminal dials a group call request number to send a group call request message to PSTN/PLMN, requesting to initiate a group call;

Step 302, the PSTN/PLMN routes the call to the group call front end of the visited location according to the called number;

Step 303, after the group call front-end processor obtains the group number of the group call according to the called number analysis, it sends a group information request message to the group call register at the place where the group belongs to request the group information of this group, and the group information request message includes The group number with the group call;

Step 304, after the group call register receives the group information request message, it searches for the corresponding group information according to the group number, and returns the group information of the group to the group call front-end device through the group information return message, including but not limited to For the following information: the access numbers of all members of this group, as well as the attributes of each member, the permissions of each member, etc.;

Step 305: After receiving the group information return message, the group call front-end device initiates a call to all members according to the member information in the group. Members here can be mobile users or fixed network users;

Step 306, after any member in the group rings and responds, the group call front-end device sends a ringing response message to the PLMN/PSTN, and when the group call front-end device receives the subsequent member's ringing response message, it no longer sends a ringing response message to the PLMN/PSTN Send a ringing response message;

Step 307, PLMN/PSTN forwards the ringing response message to the calling terminal;

Step 308, after any member in the group goes off-hook to answer, the group call front-end device returns an off-hook response message to the PLMN/PSTN, and when the group call front-end device receives an off-hook response message from a subsequent member, it no longer sends an off-hook response message to the PLMN/PSTN. PSTN sends an off-hook response message;

In step 309, the PLMN/PSTN forwards the off-hook response message to the calling terminal.

When the group call dispatching station initiates a group call, the group call dispatching station directly requests group information to the group call server. Fig. 4 is a flow diagram of the group call dispatching station initiating a group call, including the following steps:

Step 401, the group call dispatcher sends a group call request message from the group call dispatcher to the group call server to which it belongs, the message contains a group number and may carry corresponding group information;

Step 402, the group call server forwards the group call dispatcher group call request message to the group call front end;

Step 403, if there is no group information (group information including but not limited to the following information: group member access number, member authority, etc.) of the designated group number in the group call request message of the group call dispatching station, the group call front-end device sends the group call register Send a group information request message to request the group information of the specified group number; if the group information with the specified group number is included in the group call request message, step 405 is directly performed;

Step 404, the group call register searches for the group information of the corresponding group according to the group number, returns a message through the group information, and returns the group information of the specified group number to the group call front-end device;

Step 405, the group call front-end device initiates a call to the members in the group according to the group information, where the members can be mobile users or fixed network users;

Step 406, when a member rings and answers, the group call front-end device sends the current user's ringing notification message to the group call server, and when other members ring and answers, the group call front-end device also sends a notification message to the group call server Send a ringing notification message for this user;

Step 407, the group call server forwards the ringing notification message to the group call dispatcher;

Step 408, when a certain member goes off-hook to answer, the group call front-end device sends the current user's answer notification message to the group call server, and when other members go off-hook to answer, the group call front-end device also sends a notification message to the group call server The reply notification message for this user;

Step 409, the group call server forwards the response notification message to the group call dispatcher.

Fig. 5 is the schematic flow chart of revising group information of group call dispatching platform, comprises the following steps:

Step 501, the group call dispatcher revises the group information of the specified group number, and sends a group information modification request message to the group call server, the message includes but not limited to the following information: group number, group member access number, group member attribute, group membership privileges, etc.;

Step 502, the group call server forwards the group information modification request message to the group call front end;

Step 503, the group call front-end device sends a group modification request message to the group call register, requesting the group call register to modify the group information of the corresponding group, the message includes but not limited to the following information: group number, group member access number, group member attributes, group membership permissions, etc.;

Step 504, after the group call register receives the group information modification request message, it modifies the group information of the specified group number, and then sends a group modification response message to the group call front-end processor;

Step 505, the group call front-end processor receives the group modification response message sent by the group call register, and sends the group information modification response message to the group call server;

Step 506, the group call server forwards the group information modification corresponding message to the group call dispatcher.

Figure 6 and Figure 7 respectively show a schematic flow diagram of dynamically adding and deleting a call member by a terminal during a group call call, wherein the process of dynamically adding a call member includes the following steps:

Step 601, during the group call process, the terminal sends a dynamic call member request message to the PLMN/PSTN through a specific dialing method. The request message includes but is not limited to the following information: current group number, new member's number, etc.;

In step 602, the PLMN/PSTN forwards a request message for dynamically adding call members to the group call front-end;

In step 603, the group call front-end device initiates a call to the new member without sending called ringing and answering messages to the terminal.

The process of dynamically deleting call members includes the following steps:

Step 701, during the group call process, the terminal sends a request message to PLMN/PSTN to dynamically delete call members through a specific dialing method. The request message includes but is not limited to the following information: current group number, member number to be deleted, etc.;

In step 702, the PLMN/PSTN forwards a request message for dynamically deleting a call member to the group call front-end;

Step 703, the group call front-end extracts the member number in the request message, searches for the call corresponding to the specified member in the current group call process, and if found, terminates the corresponding call; otherwise, ignores the request.

Fig. 8 and Fig. 9 respectively show the process of dynamically adding and deleting a call member in the group call dispatching station during the group call conversation, wherein the process of dynamically adding a call member includes the following steps:

Step 801, during the group call process, the group call dispatching station sends a group call dispatching station to add a call member request message to the group call server, the request message includes but not limited to the following information: the current group number, the number of the new member, etc.;

Step 802, the group call server forwards the group call dispatcher to add a call member request message to the group call front-end, and simultaneously sends back a group call dispatcher to add a call member response message to the group call dispatcher;

Step 803, the group call front end initiates a call to the new member;

Step 804, the new member rings, the group call front end sends a ringing notification message to the group call server, and the group call server sends a ringing notification message to the group call dispatcher;

Step 805, the new member answers, the group call front-end device sends a response notification message to the group call server, and the group call server sends a response notification message to the group call dispatcher;

The process of dynamically deleting call members includes the following steps:

Step 901, during the group call process, the group call dispatcher sends a request message to the group call server to delete the call member. The request message includes but not limited to the following information: current group number, member number to be deleted, etc.;

Step 902, the group call server forwards the group call dispatching station to delete the call member request message to the group call front-end device, and sends back the group call dispatching station delete call member response message to the group call dispatching station at the same time;

Step 903, the group call front-end device extracts the member number in the request message, searches for the call corresponding to the specified member in the current group call process, if found, terminates the corresponding call, and sends a release notification message to the group call server; otherwise, ignore this requests.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (12)

1. a system that realizes group-calling service is characterized in that, comprising:

Group Call Register links to each other with existing telephone network, is used to preserve the group information of major region;

Group calling switching center, be connected with Group Call Register by existing telephone network, be used for by with the Group Call Register data sync, the group information that will be under the jurisdiction of this service area is extracted local and is preserved, also is used for realizing the group-calling service that group calling switching center initiates in conjunction with Group Call Register from Group Call Register;

Described group calling switching center comprises group calling front end processor, group calling server and group calling dispatching desk, wherein:

The group calling front end processor links to each other with existing telephone network by the NO.7 signaling method, is used to finish the group calling function of exchange;

The group calling server is connected with the group calling front end processor, is used for by group calling front end processor and Group Call Register data sync, and the group information that will be under the jurisdiction of this service area is extracted local and preservation from Group Call Register, and management group calling dispatching desk;

The group calling dispatching desk is connected with the group calling front end processor, is used for directly initiating group calling in conjunction with group calling server, group calling front end processor, and modification group information.

2. the system of realization group-calling service according to claim 1 is characterized in that, the group calling front end processor is connected with group calling server and group calling dispatching desk by the TCP/IP mode.

3. a method that realizes group-calling service is characterized in that, comprising:

The data sync step, group calling switching center by with the Group Call Register data sync, the group information that will be under the jurisdiction of this service area is extracted local and is preserved from Group Call Register;

The group calling performing step, group calling switching center realizes the group-calling service that group calling switching center initiates in conjunction with Group Call Register;

Described group calling switching center comprises group calling front end processor, group calling server and group calling dispatching desk, wherein:

Described group calling front end processor links to each other with existing telephone network by the NO.7 signaling method, is used to finish the group calling function of exchange;

Described group calling server is connected with the group calling front end processor, is used for by group calling front end processor and Group Call Register data sync, and the group information that will be under the jurisdiction of this service area is extracted local and preservation from Group Call Register, and management group calling dispatching desk;

Described group calling dispatching desk is connected with the group calling front end processor, is used for directly initiating group calling in conjunction with group calling server, group calling front end processor, and modification group information;

When the group calling dispatching desk in the described group calling switching center was initiated group calling, described group calling performing step specifically comprised:

Step 401, the group calling dispatching desk sends group calling dispatching desk group calling request message to affiliated group calling server, has group number and corresponding group information in the message;

Step 402, the group calling server is transmitted group calling dispatching desk group calling request message to the group calling front end processor;

Step 403 judges whether the group information of specifying group number is arranged in the group calling dispatching desk group calling request message, if direct execution in step 405, otherwise the group calling front end processor asks to specify the group information of group number to Group Call Register transmission group information request message;

Step 404, Group Call Register search the group information of corresponding group according to group number, by group information return messages, return the group information of specifying group number to the group calling front end processor;

Step 405, the group calling front end processor makes a call to the group member according to group information;

Step 406, any member's ring is replied, and the group calling front end processor sends active user's ringing message to the group calling server;

Step 407, the group calling server is transmitted ringing message to the group calling dispatching desk;

Step 408, any member's off-hook is replied, and the group calling front end processor sends active user's answer-notification message to the group calling server;

Step 409, the group calling server is transmitted answer-notification message to the group calling dispatching desk.

4. the method for realization group-calling service according to claim 3 is characterized in that, described group calling switching center comprises group calling front end processor, group calling server and group calling dispatching desk, and described data sync step specifically comprises the steps:

Step 201, group calling server send local group information request message to the group calling front end processor;

Step 202, group calling front end processor are transmitted to affiliated Group Call Register after receiving local group information request message, carry the information of sign local terminal identity in the local group information request message;

After step 203, Group Call Register are received local group information request message, find out the group information that is under the jurisdiction of the group calling server, send to the group calling front end processor by this locality group information return messages according to the information of sign local terminal identity;

After step 204, group calling front end processor are received this locality group information return messages of Group Call Register, to the group calling server forwards;

After step 205, group calling server are received local group of information return messages, storage group information wherein.

5. the method for realization group-calling service according to claim 4 is characterized in that, when terminal was initiated group calling, described group calling performing step specifically comprised:

Step 301, terminal send to PSTN/PLMN and initiate the group calling request message;

Step 302, PSTN/PLMN routes the call to the group calling front end processor on visit ground according to called number;

Step 303, group calling front end processor to the Group Call Register transmission group information request message of this group ownership place, are asked the group information of this group after analysis draws the group number of group calling according to called number, include the group number of this group calling in the group information request message;

Step 304, Group Call Register are searched for corresponding group information according to group number after receiving the group information request message, and return the group information of this group to the group calling front end processor by group information return messages;

After step 305, group calling front end processor were received group information return messages, the information about firms according in the group made a call to all members;

Step 306, after first member's ring response, the group calling front end processor sends the ring response message to PLMN/PSTN in the group;

Step 307, PLMN/PSTN transmits this ring response message to the terminal that makes a call;

Step 308, after first member's off-hook was replied in the group, the group calling front end processor was replied the off-hook response message to PLMN/PSTN;

Step 309, PLMN/PSTN transmits this off-hook response message to the terminal that makes a call.

6. the method for realization group-calling service according to claim 5 is characterized in that, in the group-calling process, also comprises the step of dynamic increase conversation member, specifically comprises:

Step 601, terminal send to the group calling front end processor by PLMN/PSTN dynamically increases the conversation member request message, comprises current group number and newcomer's number;

Step 602, the group calling front end processor is initiated the calling to the newcomer, is established to newcomer's conversation, and the centre does not send called terminal ringing and response message to terminal.

7. the method for realization group-calling service according to claim 6 is characterized in that, in the group-calling process, also comprises the step of dynamic deletion conversation member, specifically comprises:

Step 701, terminal sends dynamically deletion conversation member request message by PLMN/PSTN to the group calling front end processor, comprises current group number and the member's number that will delete;

Step 702, the group calling front end processor extracts the member's number in the request message, searches for the calling of mandatory member's correspondence in the current group-calling process, if search, then stops corresponding the calling; Otherwise, ignore request this time.

8. the method for realization group-calling service according to claim 3 is characterized in that, in the group-calling process, also comprises the step of dynamic increase conversation member, specifically comprises:

Step 801, the group calling dispatching desk sends the group calling dispatching desk by the group calling server to the group calling front end processor increases the conversation member request message, comprises current group number and newcomer's number;

Step 802, the group calling server increases the conversation member response message to group calling dispatching desk loopback group calling dispatching desk;

Step 803, the group calling front end processor is initiated the calling to the newcomer;

Step 804, newcomer's ring, the group calling front end processor sends ALERTING message to the group calling server, and the group calling server sends ringing message to the group calling dispatching desk;

Step 805, the newcomer replys, and the group calling front end processor sends response message to the group calling server, and the group calling server sends answer-notification message to the group calling dispatching desk.

9. the method for realization group-calling service according to claim 8 is characterized in that, in the group-calling process, also comprises the step of dynamic deletion conversation member, specifically comprises:

Step 901, group calling dispatching desk send group calling dispatching desk deletion conversation member request message by the group calling server to the group calling front end processor in group-calling process, comprise current group number and the member's number that will delete;

Step 902, the group calling server is to group calling dispatching desk loopback group calling dispatching desk deletion conversation member response message;

Step 903, the group calling front end processor extracts the member's number in the request message, searches for the calling of mandatory member's correspondence in the current group-calling process, if search, then stops corresponding the calling, sends to the group calling server to discharge notification message; Otherwise, ignore request this time.

10. according to the method for claim 4,5,6,7,8 or 9 described realization group-calling services, it is characterized in that described group of information includes but not limited to following information: all member's access codes, member property and member's authority of this group.

11. the method for realization group-calling service according to claim 10 is characterized in that, also comprises the step of group calling dispatching desk modification group information, specifically comprises:

Step 501, group calling dispatching desk revise to be specified the group information of group number, by the group calling server to group calling front end processor transmission group information modify request messages;

Step 502, group calling front end processor require Group Call Register to revise the group information of corresponding group to Group Call Register transmission group modify request messages;

After step 503, Group Call Register are received group information modify request messages, the group information of specifying group number is made amendment, revise response message to group calling front end processor transmission group then;

Step 504, group calling front end processor are received the group modification response message that Group Call Register is sent, and revise response message by the group calling server to group calling dispatching desk transmission group information.

12. the method for realization group-calling service according to claim 11 is characterized in that, group information modify request messages is including but not limited to following information: group number, group membership's access code, group membership's attribute and group membership's authority.

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