CN100455072C - A method and system for realizing trunking call service - Google Patents

Abstract

The invention discloses a method and system for realizing group call service. The method includes: A. The push-to-talk key of the calling trunking terminal is triggered to generate a call establishment request; B. The calling trunking terminal adds preset trunking service information to the call establishment request, and judges that it is currently in a non-trunking When the service covers the area, the request is sent to the mobile switching center through the base station subsystem; C. The mobile switching center routes the call to the trunking switching center through the trunking dispatching system; D. The trunking switching center checks the trunking call service authorization of the calling user , if the service has been authorized, the trunking switching center pages the called terminal and establishes the call.

Description

A method and system for realizing trunking call service

technical field

The present invention relates to the field of mobile communication, in particular to a method and system for realizing trunking call service.

Background technique

The trunking communication system is a mobile communication system used for group dispatching and command communication. The available channels of the system can be shared by all users of the system, and it has the function of automatically selecting channels. Purpose, high-efficiency wireless dispatching communication system. The main feature of trunking communication is that it adopts PTT (Push To Talk, push-to-talk), and connects in a push-to-talk manner. One-to-many group calls and other functions.

In the past, trunking dispatching communication was dedicated to public security, fire protection, transportation and other fields. With the development of digital technology, digital trunking communication technology based on public communication network has attracted the attention of the industry. Through this technology, it is possible to realize the unified network of shared network trunking and professional dispatching. The business model enables ordinary public communication network users to use the services provided by the trunking communication system and enjoy diversified services.

The public digital trunking communication network is the future development direction of the communication network. The construction of the network takes a long time, and there is no large-scale commercial use at present. Therefore, the trunking service may be realized in a certain area of the public communication network at the initial stage of construction. For public How to implement trunking communication for terminals in a non-trunking service coverage area in a communication network is a problem that needs to be solved. The prior art provides a method for an ordinary telephone terminal to access a digital trunking system. Through a trunking access gateway installed between the ordinary telephone terminal system and the digital trunking system, the ordinary telephone terminal is connected to the digital trunking system. Participate in group calls. However, in this method, the user must refer to or memorize various operation methods to operate the terminal to perform various trunking services. For example, the group service access code must be dialed before the trunking number to initiate a trunking call. The operation mode is different, and it is very inconvenient to use, and the user cannot feel the superior experience brought by the one-touch operation mode in the cluster communication.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method and system for realizing the trunking call service, users can access the digital trunking system from the non-trunking service coverage area of the public communication network as long as they adopt the same simple operation mode as the traditional trunking terminal The trunking call service is realized, and the user's satisfaction with the service is improved.

In order to solve the problems of the technologies described above, the purpose of the present invention is achieved through the following technical solutions:

A method for implementing a trunking call service, wherein trunking service information is preset in a trunking terminal; the method includes:

A. The push-to-talk button of the calling trunking terminal is triggered to generate a call establishment request;

B. When the calling trunking terminal adds the preset trunking service information to the call establishment request, and judges that it is currently in a non-trunking service coverage area, it sends the request to the mobile switching center through the base station subsystem;

C. The mobile switching center routes the call to the trunking switching center through the trunking dispatching system;

D. The trunking switching center checks the authorization status of the trunking call service of the calling user. If the service has been authorized, the trunking switching center pages the called terminal and establishes a call.

Wherein, the trunking switching center checks the trunking call service authorization of the calling user specifically includes: the trunking switching center queries the group list management server for the service subscription information of the calling user, and checks the trunking call service authorization according to the information.

Wherein, after step D, it further includes: the called terminal analyzes the information carried in the call setup request, and displays the calling party number and trunking service type on the terminal interface.

Wherein, after step D, it further includes: the trunking switching center sends a trunk call establishment success message to the mobile switching center through the trunking dispatching system; after receiving the message, the mobile switching center returns a response message to the trunking switching center through the trunking dispatching system.

The trunking switching center sends a talk right prompt to the trunking terminal;

The trunking terminal sends user operation information to the trunking dispatching system through the mobile switching center;

The cluster scheduling system forwards the user operation information to the cluster switching center;

The trunking switching center realizes the control of the speaking right according to the user operation information.

Wherein, the speech right prompt is a speech right authorization prompt, a speech right idle prompt, or a speech right occupation prompt.

Wherein, the speaking right prompt is a single-tone prompt tone or a voice stream prompt tone.

Wherein, the sending of the user operation information by the trunking terminal to the trunking dispatching system is sending the information that the user presses the push-to-talk key or the information that the user releases the push-to-talk key.

In addition, the step before step B further includes: the calling trunking terminal registers the trunking service with the base station subsystem.

In step B, the determination that the calling trunking terminal is in a non-trunking service coverage area specifically includes:

If the calling cluster terminal does not receive the registration response message returned by the base station subsystem, it determines that it is in a non-trunking service coverage area.

In step B, the judging that the calling trunking terminal is in a non-trunking service coverage area may also include:

After receiving the registration response message returned by the base station subsystem, the calling cluster terminal determines that it is in a non-trunking service coverage area according to the information carried in the response message.

A trunking call service realization system, comprising:

The trunking terminal is used to pre-store trunking service information. After the push-to-talk key is triggered to generate a call establishment request, the trunking service information is added to the call establishment request, and when it is judged that it is currently in a non-trunk service coverage area, the trunking service is sent through the base station subsystem. The mobile switching center sends the request;

The base station subsystem is used for forwarding the call establishment request between the trunking terminal and the mobile switching center;

The mobile switching center is used to send the call establishment request sent by the trunking terminal to the trunking dispatching system;

A trunking dispatching system, for forwarding the call establishment request to the trunking switching center;

The trunking switching center is used to check the authorization status of the trunking call service of the user, and page the called terminal to establish the trunking call when the inspection is passed.

Wherein, the trunking terminal is also used to use different key values to represent user operation information after obtaining the speaking right, and send the information to the trunking dispatching system through the mobile switching center; the trunking dispatching system is also used to call the terminal Access to the dispatching service subsystem, the dispatching service subsystem includes a group list management server and a cluster switching center, and the cluster switching center is also used to implement corresponding speaking right control according to the speaking right signaling sent by the trunking dispatching system.

In addition, when the trunking terminal is the called trunking terminal, it is also used to analyze the information carried in the call establishment request, and display the calling party number and trunking service type information on the terminal interface.

As can be seen from the above technical solutions, the present invention has the following advantages:

In the present invention, the push-to-talk key of the calling trunking terminal is triggered, and after generating a call establishment request, the calling trunking terminal sends the request to the trunking switching center through the mobile switching center and the trunking dispatching system. call the terminal and set up a call; among them, the user only needs to directly dial the trunk number and press the push-to-talk key to access the digital trunking system from the non-trunk service coverage area of the public communication network to establish a trunk call; after the call is successfully established and the right to speak After that, the user can also continue to press the push-to-talk key to speak directly or release the push-to-talk key to release the right to speak, because the same operation mode as the traditional trunking terminal is adopted, so that the user has the same operation experience for the same service, which is different from the existing technology. Compared with users who have to refer to or memorize various operation methods in order to operate the terminal, the operation is also more convenient, which improves the user's satisfaction with communication services.

Description of drawings

Fig. 1 is the system diagram of the digital trunking communication system based on the public communication network of the present invention;

Fig. 2 is a flowchart of an embodiment of a method for implementing a trunk call service when the calling trunk terminal is in a non-cluster coverage area;

Fig. 3 is a flow chart of an embodiment of a method for implementing a trunk call service when the called trunk terminal is in a non-trunk coverage area.

Detailed ways

Referring to Fig. 1, the digital trunking communication system based on the public communication network includes a trunking terminal 101, a base station subsystem 102, a mobile switching subsystem 105, a trunking dispatching system 106 and a dispatching service subsystem 107, wherein:

The trunking terminal 101 can support the functions of ordinary terminals, and also integrates the push-to-talk function of traditional trunking terminals. Users can realize trunking services through the same operation mode as traditional trunking terminals; Trunking service information such as trunking service type, after the call establishment request is generated when the push-to-talk button is triggered, the trunking service information is added to the call establishment request, and it is judged that when it is currently in a non-trunk service coverage area, the call establishment request is passed through the trunking The dispatching system 106 sends it to the trunking switching center 108; in addition, after the trunking terminal 101 obtains the right to speak, it can use different key values to represent the user's current operation information, and pass the information through the mobile switching subsystem 105 through the dual-tone multi-frequency signal Send it to the trunking dispatching system 106; the trunking terminal 101 is also used to analyze the information carried in the call setup request, and display the calling party number and trunking service type on the terminal interface.

The base station subsystem 102 includes a base transceiver station 103 and a base station controller 104 . When the calling trunking terminal is in the trunking service coverage area, since the base station transceiver 103 and the base station controller 104 provide the trunking function, the base station subsystem 102 can directly route the trunking call to the dispatching service subsystem 107, and the trunking center 108 performs trunking Call processing: when the calling trunking terminal is in a non-trunking service coverage area, the base station subsystem 102 forwards the call request to the trunking dispatching system 106 through the mobile switching subsystem 105, and the trunking dispatching system 106 performs trunking call processing through the trunking switching center 108 .

Mobile switching subsystem 105 includes mobile switching center 110 . The mobile switching center 110 is a connecting device for the interconnection and intercommunication between the digital trunking system and the public communication network in the call service, and is used to forward the call establishment request and the dual-tone multi-frequency signal initiated by the trunking terminal 101 to the trunking dispatching system 106 .

The trunking dispatching system 106 is used to connect the call of the terminal to the dispatching service subsystem 107, and complete the interaction and conversion of signaling and media streams between the public communication system and the digital trunking system; The audio multifrequency signal is encapsulated in the talk right signaling and sent to the trunking switching center 108 .

The scheduling service subsystem 107 includes a group list management server 109 and a virtual cluster switching center 108 . The group list management server 109 provides storage and management functions for cluster service users and group information. The trunking switching center 108 is used to query the information of the user or group to the group list manager 109, and completes the processing of the trunking call according to the information, including setting up trunking calls such as individual calls and group calls; The sent right-of-speak signaling implements corresponding right-of-speak control.

When the calling group terminal is in a non-group service coverage area, the method for realizing the group call service provided by the present invention is:

SA1. Preset trunking service information such as trunking number prefix and trunking service type in the calling trunking terminal.

SA2～SA3, the push-to-talk button of the calling trunking terminal is triggered, and a call establishment request is generated; the calling trunking terminal adds the preset trunking service information to the call establishment request, and judges that if it is currently in a non-trunking service coverage area, then The request is sent to the mobile switching center through the base station subsystem; wherein, in the embodiment of the present invention, after the user dials the group number or the called user number, the trigger of the talk button is realized by pressing the push-to-talk button.

SA4. After receiving the call establishment request, the mobile switching center learns that the service is a trunking call according to the trunking service information in the request, and forwards the call request to the trunking switching center through the trunking dispatching system.

SA5. The trunking switching center queries the group list management server for the trunking service subscription information of the calling user, and checks the service authority authorization of the calling user according to the information. If the service is not authorized, it refuses to initiate the call and ends the process; if After passing the service authorization check, the trunking switching center initiates a trunking call service and pages the called party.

SA6. After the called user responds to the call, the trunking switching center sends a trunking call establishment success message to the mobile switching center through the trunking dispatching system; after receiving the message, the mobile switching center returns a response message to the trunking switching center.

SA7. The trunking switching center sends a speech right authorization prompt to the calling trunking terminal.

Referring to FIG. 2, an embodiment of a method for realizing a trunk call service when the calling trunk terminal is in a non-trunk service coverage area is described in detail below.

Step 201. Preset trunking service information in the calling trunking terminal; the trunking service information includes trunking number prefix, trunking service type and other information.

In step 202, the user dials the group number or the called user number and then presses a push-to-talk key to initiate a group call.

Step 203, the calling trunking terminal automatically adds the preset trunking service information to the call setup request, and judges that if it is currently in a non-trunking service coverage area, it sends a call setup request to the mobile switching center through the base station subsystem, and continues to execute the steps 204: If currently in the trunking service coverage area, the call is directly routed to the dispatching service subsystem through the base station subsystem, and the trunking call is processed by the trunking switching center. The call establishment request includes trunking service information such as trunking number prefix and trunking service type, and information such as group number or called user number.

The calling group terminal will periodically register with the network. In this embodiment, if the calling trunking terminal does not receive a registration response from the network, the calling trunking terminal determines that it is currently in a non-trunking service coverage area; if the network returns a registration response message, the calling trunking terminal The terminal location information judges whether it is currently in a non-trunk service coverage area or in a trunk service coverage area.

In addition, the calling trunking terminal can display the information of whether it is currently in the coverage area or non-coverage area of the trunking service on the terminal interface as an icon. Which area, the method for the user to operate the terminal is the same.

Step 204, after the Mobile Switching Center receives the call setup request, it learns that this service is a trunk call according to the trunk service information in the request, and sends SIP INVITE (invite) signaling to the trunk dispatching system, requesting to set up the trunk call; SIP INVITE In the signaling, the From field carries the mobile subscriber directory number of the calling user, and the To field carries trunk service information and group number or trunk number information of the called subscriber.

Step 205, after the trunking dispatching system receives the SIP INVITE signaling, it forwards the signaling to the trunking switching center; the From field in the signaling carries the mobile subscriber directory number of the calling user, and the To field carries the trunking service type information and group number Or the group number information of the called user.

Step 206, the trunking switching center queries the group list management server for the trunking service subscription information of the calling user according to the mobile subscriber directory number of the calling user, and checks the service authority authorization of the calling user according to the queried subscription information , if the service is not authorized, refuse to initiate a call, and end the process; if the service authorization check is passed, the trunking switching center initiates a trunking call service, and pages the called terminal.

Step 207 to step 209, after the called terminal responds, the trunking switching center sends SIP 180Ringing (ringing) signaling to the trunking scheduling system, indicating that the called user is ringing; the trunking scheduling system forwards the SIP180Ringing signaling to the mobile switching center; After receiving the SIP 180Ringing signaling, the mobile switching center plays a ringback tone to the calling TMS.

Step 210 to step 212, the trunking switching center sends SIP 200OK signaling to the trunking dispatching system, indicating that the trunking call is established successfully; the trunking dispatching system forwards the signaling to the mobile switching center; after the mobile switching center receives the SIP 200OK signaling, it passes The dispatching system returns SIP ACK (response) signaling to the trunking switching center, and sends a trunking call establishment completion message to the calling trunking terminal.

Step 213: After receiving the SIPACK signaling, the trunking switching center sends a speech right authorization prompt to the calling trunking terminal; wherein, the speech right prompt can be flexibly recorded, such as single tone or voice stream.

Step 214, after the calling group terminal receives the voice authorization prompt, it sends a DTMF signal to the mobile switching center through the base station subsystem, and the signal carries the information of the user operating the trunking terminal; the mobile switching center sends the dual tone multi-frequency The signal is forwarded to the cluster scheduling system.

Among them, the way for the user to operate the trunking terminal is the same as the way for operating the traditional trunking terminal; the user can choose to continue to press the push-to-talk key to speak directly or release the push-to-talk key to release the right to speak. The user's operation information is encapsulated in the DTMF signal through different key values. For example, the button "*" means to apply for the right to speak, and the button "#" means to release the right to speak.

Step 215, the trunking dispatching system encapsulates the dual-tone multi-frequency signal in the SIP INFO signaling, and sends the SIP INFO signaling to the trunking switching center; the trunking switching center realizes corresponding speaking rights according to the user operation information carried in the SIP INFO signaling control.

After the calling user releases the speaking right, the call enters an idle state without talking, and the trunking switching center sends a speech right idle prompt to all users of the calling. The calling user can re-apply for the speaking right to the cluster switching center.

The trunking terminal will regularly register with the network, and the trunking switching center will page the called terminal according to the registration information after receiving the call request from the calling terminal. If the called trunking terminal has not registered with the trunking switching center, or has registered but the called terminal does not respond when the trunking switching center paging, the trunking switching center will consider the called terminal to be in an area not covered by the trunking service. The following describes the method for implementing the trunking call service when the called trunking terminal is in a non-trunking service coverage area.

SB1. Preset trunking service information such as trunking number prefix and trunking service type in the calling trunking terminal.

SB2～SB3, the push-to-talk key of the calling trunking terminal is triggered to generate a call establishment request, the calling trunking terminal adds the preset trunking service information to the call establishment request, and judges that if it is currently in a non-trunking service coverage area, then Send a call establishment request to the mobile switching center through the base station subsystem, and then the mobile switching center will route the call to the trunking switching center through the trunking dispatching system; if it is currently in the trunking service coverage area, the call will be directly routed to the dispatching service through the base station subsystem Subsystem, the dispatching service subsystem then sends the request to the trunking switching center; wherein, in the embodiment of the present invention, after the user dials the group number or the called user number, the triggering of the call button is realized by pressing the button to talk .

SB4. The trunking switching center sends a call establishment request to the mobile switching center through the trunking scheduling system; the mobile switching center sends the request to the called trunking terminal through the base station subsystem.

SB5. The called trunking terminal returns a trunking call establishment completion message to the mobile switching center.

SB6. The mobile switching center sends a trunk call establishment success message to the trunking switching center through the trunking dispatching system; after receiving the trunking call establishment success message, the trunking switching center returns a response message to the mobile switching center through the trunking dispatching system, indicating that the call establishment is completed.

SB7. After the calling trunking terminal releases the speaking right, the trunking switching center sends a speech right idle prompt to the called trunking terminal, prompting that the called trunking terminal can apply for the speaking right.

The following describes in detail an embodiment of a method for implementing a trunking call service when the called trunking terminal is in a non-trunking service coverage area with reference to FIG. 3 .

Step 301. Preset trunking service information in the calling trunking terminal; the trunking service information includes trunking number prefix, trunking service type and other information.

In step 302, the user dials the number of the called user and then presses a push-to-talk key to initiate a group call.

Step 303, the calling trunking terminal automatically adds the preset trunking service information to the call setup request, and judges that if it is currently in a non-trunking service coverage area, it sends a call setup request to the mobile switching center through the base station subsystem, and then the mobile The switching center routes the call to the trunking switching center through the trunking dispatching system; if it is currently in the trunking service coverage area, the call is directly routed to the dispatching service subsystem through the base station subsystem, and the dispatching service subsystem sends the call establishment request to the trunking switching center center.

The calling group terminal will periodically register with the network. In this embodiment, if the calling trunking terminal does not receive a registration response from the network, the calling trunking terminal determines that it is currently in a non-trunking service coverage area; if the network returns a registration response message, the calling trunking terminal The terminal location information judges whether it is currently in a non-trunk service coverage area or in a trunk service coverage area.

Step 304, the trunking switching center sends a SIP INVITE signaling to the trunking dispatching system, requesting to establish a trunking call. The From field in the signaling carries the call type and the group number information of the calling user, and the To field carries the mobile subscriber directory number of the called user.

Step 305, the trunking dispatching system forwards the received SIP INVITE signaling to the mobile switching center. In the signaling, the From field carries the trunk number information of the calling user, and the To field carries the mobile subscriber directory number of the called user.

Step 306, the mobile switching center processes the call, and sends a call establishment request to the called terminal through the base station subsystem; the called terminal analyzes the information carried in the request after receiving the request, and sends the calling user's mobile subscriber directory number and cluster The call type is displayed on the terminal interface, such as "group call: trunk group number 8181" or "single call: calling group number 1818".

Step 307, the called terminal returns a trunk call establishment complete message to the mobile switching center.

From step 308 to step 309, the mobile switching center sends SIP 180Ringing signaling to the trunking dispatching system, indicating that the called user is ringing; the trunking dispatching system forwards the SIP 180Ringing signaling to the trunking switching center.

Step 310, the mobile switching center sends a SIP200 OK signaling to the trunking switching center through the trunking dispatching system, indicating that the called user calls successfully.

Step 311: After receiving the SIP 200 OK signaling, the trunking switching center returns the SIPACK signaling to the mobile switching center through the trunking scheduling system.

Step 312, after the calling trunking terminal releases the speaking right, the trunking switching center sends a speech right idle prompt to the called trunking terminal.

After receiving the prompt that the speaking right is free, the called user can apply for the speaking right by pressing the push-to-talk key.

Step 313, the called trunking terminal sends a dual-tone multi-frequency signal to the mobile switching center through the base station subsystem, and the signal carries the information that the user presses the push-to-talk key; the mobile switching center forwards the dual-tone multi-frequency signal to the trunking dispatching system .

Step 314, the trunking dispatching system encapsulates the DTMF signal into the SIP INFO signaling, and sends the SIP INFO signaling to the trunking switching center.

Step 315, the trunking switching center sends a speech right authorization prompt to the called trunking terminal according to the user button information carried in the SIP INFO signaling.

In each of the above embodiments, SIP (Session Initiation Protocol, Session Initiation Protocol) is used for signaling interaction between the mobile switching center and the trunking dispatching system and between the trunking dispatching system and the trunking switching center. In the present invention, other standard protocols such as ISUP (ISDN UserPart, Integrated Services Digital Network User Part) or MAP (Mobile Application Protocol, Mobile Application Protocol) etc. can also be used to carry out signaling interaction, without any impact on the realization of the inventive method.

The method and system for realizing the trunking call service provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The descriptions of the above embodiments are only used to help understand the present invention. method and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. Invention Limitations.

Claims (14)

1. A method for implementing a trunking call service, characterized in that trunking service information is preset in a trunking terminal; the method includes: A. The push-to-talk button of the calling trunking terminal is triggered to generate a call establishment request; B. When the calling trunking terminal adds the preset trunking service information to the call establishment request, and judges that it is currently in a non-trunking service coverage area, it sends the request to the mobile switching center through the base station subsystem; C. The mobile switching center routes the call to the trunking switching center through the trunking dispatching system; D. The trunking switching center checks the authorization status of the trunking call service of the calling user. If the service has been authorized, the trunking switching center pages the called terminal and establishes a call. 2. The method for implementing the trunking call service according to claim 1, wherein the trunking call service authorization of the calling user by the trunking switching center specifically includes: The trunking switching center inquires the service subscription information of the calling user from the group list management server, and checks the trunking call service authorization according to the information. 3. The method for realizing trunking call service according to claim 1, characterized in that, after step D, further comprising: The called terminal analyzes the information carried in the call setup request, and displays the calling party number and trunking service type on the terminal interface. 4. The method for realizing trunking call service according to claim 1, characterized in that, after step D, further comprising: The trunking switching center sends a trunk call establishment success message to the mobile switching center through the trunking dispatching system; after receiving the message, the mobile switching center returns a response message to the trunking switching center through the trunking dispatching system. 5. The method for realizing trunking call service according to claim 4, characterized in that the method further comprises: The trunking switching center sends a talk right prompt to the trunking terminal; The trunking terminal sends user operation information to the trunking dispatching system through the mobile switching center; The cluster scheduling system forwards the user operation information to the cluster switching center; The trunking switching center realizes the control of the speaking right according to the user operation information. 6. The method for implementing the trunking call service according to claim 5, wherein the speaking right prompt is a speaking right authorization prompt, a speaking right idle prompt, or a speaking right occupation prompt. 7. The method for realizing the trunking call service according to claim 5, characterized in that, the voice prompt is a single-tone prompt tone or a voice stream prompt tone. 8. The method for realizing the trunking call service according to claim 5, wherein the trunking terminal sends the user operation information to the trunking dispatching system by sending the information that the user presses the push-to-talk key or the information that the user releases the push-to-talk key. 9. The method for implementing the trunking call service according to claim 1, characterized in that the step before step B further comprises: the calling trunking terminal registers the trunking service with the base station subsystem. 10. The method for realizing the trunking call service according to claim 9, characterized in that, in step B, the judgment that the calling trunking terminal is in a non-trunking service coverage area specifically includes: If the calling cluster terminal does not receive the registration response message returned by the base station subsystem, it determines that it is in a non-trunking service coverage area. 11. The method for realizing the trunking call service according to claim 9, characterized in that, in step B, the judgment that the calling trunking terminal is in a non-trunking service coverage area specifically includes: After receiving the registration response message returned by the base station subsystem, the calling cluster terminal determines that it is in a non-trunking service coverage area according to the information carried in the response message. 12. A trunking call service implementation system, characterized in that the system includes: The trunking terminal is used to pre-store trunking service information. After the push-to-talk key is triggered to generate a call establishment request, the trunking service information is added to the call establishment request, and when it is judged that it is currently in a non-trunk service coverage area, the trunking service is sent through the base station subsystem. The mobile switching center sends the request; The base station subsystem is used for forwarding the call establishment request between the trunking terminal and the mobile switching center; The mobile switching center is used to send the call establishment request sent by the trunking terminal to the trunking dispatching system; A trunking dispatching system, for forwarding the call establishment request to the trunking switching center; The trunking switching center is used to check the authorization status of the trunking call service of the user, and page the called terminal when the inspection is passed, and establish the trunking call. 13. The trunking call service implementation system according to claim 12, wherein the trunking terminal is also used to use different key values to represent the user's operation information after obtaining the speaking right, and exchange the information through the mobile The center sends it to the cluster dispatching system; the cluster dispatching system is also used to connect the call of the terminal to the dispatching service subsystem. The dispatching service subsystem includes a group list management server and a trunking switching center. The trunking switching center is also used to The sent right-of-speak signaling implements corresponding right-of-speak control. 14. The trunking call service implementation system according to claim 12 or 13, wherein when the trunking terminal is the called trunking terminal, it is also used to analyze the information carried in the call establishment request, and to compare the calling party number and The cluster service type information is displayed on the terminal interface.

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