CN104469850A - Calling establishing method and system and dispatch interconnection server - Google Patents
Calling establishing method and system and dispatch interconnection server Download PDFInfo
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- CN104469850A CN104469850A CN201410691121.5A CN201410691121A CN104469850A CN 104469850 A CN104469850 A CN 104469850A CN 201410691121 A CN201410691121 A CN 201410691121A CN 104469850 A CN104469850 A CN 104469850A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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Abstract
The invention discloses a calling establishing method and system and a dispatch interconnection server. The calling establishing method is used for the calling establishing system, and the calling establishing system comprises the dispatch interconnection server and a telephone switching gateway. The calling establishing method includes the steps that the dispatch interconnection server monitors a calling request, initiated by a calling party terminal, for a called party terminal; the dispatch interconnection server judges whether the calling party terminal and the called party terminal belong to the same wireless communication system or not; if not, the dispatch interconnection server initiates a link establishment request to the telephone switching gateway so as to request the telephone switching gateway to establish a calling link between the wireless communication system where the calling party terminal is located and the wireless communication system where the called party terminal is located. The embodiment of the dispatch interconnection server can achieve single calling between different wireless communication systems and can distribute group calls of different systems to two devices, so that load balancing is achieved.
Description
Technical field
The embodiment of the present invention relates to communication technical field, is specifically related to a kind of call-establishing method, system and scheduling interconnected server.
Background technology
Traditional wireless communication system interconnects scheme, be summed up as following several large class: intersystem interface (Inter-System Interface, ISI) interconnected, terminal is interconnected and based on application programming interface (Application Programming Interface, API) interconnected of producer.But due to the reason such as development cost, Technology Restriction, these wireless communication systems scheme that interconnects all does not realize the individual calling between different wireless communication system.So-called individual calling: the user terminal referring to private network user according to number call to each specific user terminal, and can carry out voice call.
For wireless communication system WS1 and WS2 of private network, in certain independently call set-up systems, when a calling initiated by intercom, first call request sends to the switching center of native system, call signaling and voice link is controlled by switching center, if the number of calling is at another one wireless communication system, the intercom in such as, intercom call WS2 in WS1, then the switching center of native system can judge that this calling is unreachable, this call failure.
Namely can not realize the problem of individual calling in existing technical scheme between all unresolved different wireless communication system, therefore, be necessary that proposing a kind of new method solves the problem.
Summary of the invention
In view of this, the invention provides a kind of call-establishing method, system and scheduling interconnected server, the individual calling between different wireless communication system can be realized, and different group call can be branched on two equipment, realize load balancing.
First aspect, the call-establishing method that the embodiment of the present invention provides is for call set-up systems, and described call set-up systems comprises scheduling interconnected server and telephone exchange gateway, and described call-establishing method comprises:
Described scheduling interconnected server monitors the call request for called user terminal that call subscriber terminal is initiated;
Described scheduling interconnected server judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system;
If do not belong to, then described scheduling interconnected server initiates request for building link to described telephone exchange gateway, sets up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place to ask described telephone exchange gateway.
Preferably, in described scheduling interconnected server, preserve number home table, comprise the number of each user terminal and the wireless communication system belonging to each user terminal in described number home table, in described call request, comprise the number of described called user terminal;
Described scheduling interconnected server judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system and comprise:
According to the number of described number home table and described called user terminal, described scheduling interconnected server judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system.
Preferably, described telephone exchange gateway sets up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place by the E1 interface of the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place.
Second aspect, call set-up systems provided by the invention comprises scheduling interconnected server and telephone exchange gateway, and described scheduling interconnected server comprises:
Monitoring unit, for monitoring the call request for called user terminal that call subscriber terminal is initiated;
Judging unit, for judging whether described call subscriber terminal and described called user terminal belong to same wireless communication system;
Transmitting element, for when described call subscriber terminal and described called user terminal do not belong to same wireless communication system, initiate request for building link to described telephone exchange gateway, set up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place to ask described telephone exchange gateway.
Preferably, described scheduling interconnected server also comprises:
Memory cell, for preserving number home table, comprising the number of each user terminal and the wireless communication system belonging to each user terminal, comprising the number of described called user terminal in described call request in described number home table;
Described judging unit specifically for, the number according to described number home table and described called user terminal judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system.
Preferably, described telephone exchange gateway sets up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place by the E1 interface of the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place.
The third aspect, scheduling interconnected server provided by the invention, comprising:
Processor, for monitoring the call request for called user terminal that call subscriber terminal is initiated; Judge whether described call subscriber terminal and described called user terminal belong to same wireless communication system;
Transmitter, for when described call subscriber terminal and described called user terminal do not belong to same wireless communication system, initiate request for building link to telephone exchange gateway, set up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place to ask described telephone exchange gateway.
Preferably, described scheduling interconnected server also comprises:
Memory, for preserving number home table, comprising the number of each user terminal and the wireless communication system belonging to each user terminal, comprising the number of described called user terminal in described call request in described number home table;
Described processor judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system and comprise:
According to the number of described number home table and described called user terminal, described processor judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system.
Preferably, the call request for described called user terminal of described call subscriber terminal initiation monitored by described processor by the application programming interface API of the wireless communication system at described call subscriber terminal place.
Preferably, described telephone exchange gateway sets up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place by the E1 interface of the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages:
In the embodiment of the present invention, call set-up systems comprises scheduling interconnected server and telephone exchange gateway, when scheduling interconnected server listens to call subscriber terminal and called user terminal does not belong to same wireless communication system (i.e. different system calling), scheduling interconnected server initiates request for building link to telephone exchange gateway, call link between two wireless communication systems is set up to ask telephone exchange gateway, such an approach achieves the individual calling between different system and group calling, and existing interconnect scheme can also realize the group calling between different system, when adopting method provided by the invention to realize the group calling between different system, it can be existing InterWorking Equipment load sharing, thus achieve load balancing.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing the embodiment of the present invention is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those skilled in the art, other accompanying drawing can also be obtained as these accompanying drawings.
Fig. 1 is application scenarios embodiment schematic diagram of call-establishing method provided by the invention;
Fig. 2 is an embodiment schematic diagram of call-establishing method provided by the invention;
Fig. 3 is an embodiment schematic diagram of scheduling interconnected server provided by the invention;
Fig. 4 is another embodiment schematic diagram of scheduling interconnected server provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those skilled in the art obtain, all belongs to the scope of protection of the invention.
Embodiments provide a kind of call-establishing method, system and scheduling interconnected server, the individual calling between different wireless communication system can be realized, and different group call can be branched on two equipment, realize load balancing.
First the application scenarios of call-establishing method of the present invention is introduced below, refer to Fig. 1, call-establishing method of the present invention can be applicable to the call set-up systems 100 shown in Fig. 1, and wherein, call set-up systems 100 comprises telephone exchange gateway 101 and scheduling interconnected server 102.Scheduling interconnected server 102 is responsible for identifying that private network calls out distinctive attribute, such as individual calling, group calling, homologous ray calling, different system calling etc.; The call link between different system is set up in the responsible instruction according to scheduling interconnected server 102 of telephone exchange gateway 101.
The embodiment of the present invention mainly solves the call setup problem in private network calling between different system, WS1 and WS2 of different system such as shown in Fig. 1, WS1 and WS2 is two different wireless communication systems in dedicated network (that is two different cordless communication network), such as WS1 can be police Digital Clustering (Police Digital Trunking, PDT) wireless communication system, WS2 can be TErrestrial TRunked Radio (Terrestrial Trunked Radio, TETRA) communication system, vice versa.
Refer to Fig. 2, Fig. 2 is call-establishing method of the present invention embodiment schematic diagram, and the call-establishing method of the present embodiment comprises:
201, the call request for called user terminal that interconnected server monitors call subscriber terminal initiation is dispatched;
In specific implementation, user terminal can be the mobile terminals such as intercom, and the user terminal in the present embodiment is in private radio communication network, and private radio communication network is railway system's private network such as, public security system private network, Flood-prevention Private Network, military private network etc.
202, dispatch interconnected server and judge whether call subscriber terminal and called user terminal belong to same wireless communication system, if do not belong to, then perform step 203, if belong to, then perform step 204 and end process;
203, dispatch interconnected server and initiate request for building link to telephone exchange gateway, set up call link between the wireless communication system at call subscriber terminal place and the wireless communication system at called user terminal place to ask telephone exchange gateway.
In a specific embodiment, scheduling interconnected server can monitor the call request of call subscriber terminal initiation by the application programming interface API of the wireless communication system at call subscriber terminal place, carry the number of called user terminal in call request.Can maintain a number home table in advance in scheduling interconnected server, can comprise the number of each user terminal and the wireless communication system belonging to each user terminal in number home table, number home table can be as shown in the table:
| Wireless communication system | The number of user terminal |
| WS1 | 8732,8734,8796,8745 |
| WS2 | 8614,8615,8629,8637 |
After scheduling interconnected server receives the call request that call subscriber terminal initiates, judge whether call subscriber terminal and called user terminal belong to same wireless communication system according to the number of the called user terminal carried in call request and above-mentioned number home table.
If call subscriber terminal and called user terminal belong to same wireless communication system, then dispatch interconnected server not deal with, set up the audio call in same wireless communication system by original call center, the audio call in same wireless communication system comprises individual calling in same wireless communication system and group calling.
If call subscriber terminal and called user terminal belong to different wireless communication systems, then dispatch interconnected server and initiate request for building link to telephone exchange gateway, set up call link between the wireless communication system at call subscriber terminal place and the wireless communication system at called user terminal place to ask telephone exchange gateway.In specific implementation, telephone exchange gateway can utilize the E1 interface of two wireless communication systems to set up E1 link, thus sets up the call link between two wireless communication systems.
In addition, above-mentioned call request both can be individual calling, also can be group calling.So-called individual calling: the user terminal referring to private network user according to number call to each specific user terminal, and can carry out voice call, namely calls out one to one.So-called group calling: the user terminal referring to private network user calls out multiple user terminal according to number simultaneously, i.e. one-to-multiple call.
Citing is below described, in above-mentioned number home table, when 8732 calling 8614, scheduling interconnected server is found two user terminals according to number home table and is adhered to different wireless communication system WS1 in private network and WS2 separately, scheduling interconnected server initiates request for building link to telephone exchange gateway, to ask telephone exchange gateway to set up call link between WS1 and WS2, thus connect 8732 to 8614 calling.
In the present embodiment, when scheduling interconnected server listens to call subscriber terminal and called user terminal does not belong to same wireless communication system (i.e. different system calling), scheduling interconnected server initiates request for building link to telephone exchange gateway, call link between two wireless communication systems is set up to ask telephone exchange gateway, such an approach achieves the individual calling between different system and group calling, and existing interconnect scheme can also realize the group calling between different system, when adopting method provided by the invention to realize the group calling between different system, it can be existing InterWorking Equipment load sharing, thus achieve load balancing.
In addition, the call-establishing method that the embodiment of the present invention provides and call set-up systems can also realize the judgement of private network type of call, comprise the judgement of the special calling such as priority call, urgent call type; The intercommunication of short message, comprises the intercommunication of state short message, short text message; The functions such as the scheduling of dispatching desk inter-network, MPTY, dynamic reorganization, user management, can meet all functional requirements and performance index that interconnect in wireless private network field, can the actual solution active demand of interconnecting in wireless private network field.
Introduce the scheduling interconnected server in call set-up systems of the present invention below, refer to Fig. 3, scheduling interconnected server 300 comprises:
Monitoring unit 301, for monitoring the call request for called user terminal that call subscriber terminal is initiated;
Judging unit 302, for judging whether call subscriber terminal and called user terminal belong to same wireless communication system;
Transmitting element 303, for when call subscriber terminal and called user terminal do not belong to same wireless communication system, initiate request for building link to telephone exchange gateway, set up call link between the wireless communication system at call subscriber terminal place and the wireless communication system at called user terminal place to ask telephone exchange gateway.
Further, scheduling interconnected server 300 also comprises memory cell 304, memory cell 304 is for preserving number home table, the number of each user terminal and the wireless communication system belonging to each user terminal is comprised in number home table, comprise the number of called user terminal in call request, according to the number home table of memory cell 304 storage and the number of called user terminal, judging unit 302 specifically judges whether call subscriber terminal and called user terminal belong to same wireless communication system.
For understanding the scheduling interconnected server of the present embodiment further, illustrate the reciprocal process between each unit in the scheduling interconnected server 300 of the present embodiment below, specific as follows:
The monitoring unit 301 of scheduling interconnected server 300 monitors each user terminal in each special wireless communication system, particularly, monitoring unit 301 can monitor each user terminal by the application programming interface API of the wireless communication system at each user terminal place, when listen to the user terminal in a certain special wireless communication system make a call request time, judge whether call subscriber terminal and called user terminal belong to same wireless communication system by judging unit 302.
Wherein, the number of called user terminal is comprised in the call request that call subscriber terminal is initiated, and the memory cell 304 of scheduling interconnected server 300 stores number home table, number home table comprises the number of each user terminal and the wireless communication system belonging to each user terminal, according to the number of number home table and called user terminal, judging unit 302 judges whether call subscriber terminal and called user terminal belong to same wireless communication system.
If call subscriber terminal and called user terminal belong to same wireless communication system, then dispatch interconnected server and do not deal with, set up the audio call in same wireless communication system by original call center.
If call subscriber terminal and called user terminal belong to different wireless communication systems, then initiate request for building link by transmitting element 303 to telephone exchange gateway, set up call link between the wireless communication system at call subscriber terminal place and the wireless communication system at called user terminal place to ask telephone exchange gateway.In specific implementation, telephone exchange gateway can utilize the E1 interface of two wireless communication systems to set up E1 link, thus sets up the call link between two wireless communication systems.
In addition, above-mentioned call request both can be individual calling, also can be group calling.
In the present embodiment, the monitoring unit of scheduling interconnected server monitors the call request of call subscriber terminal initiation, and judge whether call subscriber terminal and called user terminal belong to same wireless communication system by judging unit, if do not belong to (i.e. different system calling), transmitting element initiates request for building link to telephone exchange gateway, call link between two wireless communication systems is set up to ask telephone exchange gateway, such an approach achieves the individual calling between different system and group calling, and existing interconnect scheme can also realize the group calling between different system, when adopting scheduling interconnected server provided by the invention to realize the group calling between different system, it can be original InterWorking Equipment load sharing, thus achieve load balancing.
Fig. 4 is another embodiment schematic diagram of scheduling interconnected server provided by the invention.Refer to Fig. 4, scheduling interconnected server 400 may be used for the call-establishing method that enforcement above-described embodiment provides, and scheduling interconnected server 400 comprises:
Processor 401, transmitter 402 and memory 403.Wherein, transmitter 402 and memory 403 are all connected with processor 401, such as, can be connected by bus.Certainly, scheduling interconnected server 400 can also comprise the universal components such as antenna, baseband process component, middle radio frequency processing parts, input/output unit, and the present embodiment does not do any restriction at this.
Memory 403 is for stores executable programs code, and this program code comprises computer-managed instruction.Memory 403 may comprise high-speed RAM memory, still may comprise nonvolatile memory (non-volatile memory), such as at least one magnetic disc store.
Processor 401 can be a central processing unit (Central Processing Unit, CPU), or specific integrated circuit (Application Specific Integrated Circuit, or be configured to implement one or more integrated circuits of the embodiment of the present invention ASIC).
Concrete in the present embodiment, processor 401 for, monitor the call request for called user terminal that call subscriber terminal is initiated; Judge whether described call subscriber terminal and described called user terminal belong to same wireless communication system;
Transmitter 402 for, when described call subscriber terminal and described called user terminal do not belong to same wireless communication system, initiate request for building link to telephone exchange gateway, set up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place to ask described telephone exchange gateway.
Preferably, memory 403 for, preserve number home table, comprise the number of each user terminal and the wireless communication system belonging to each user terminal in described number home table, in described call request, comprise the number of described called user terminal;
Processor 401 judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system and comprise:
According to the number of described number home table and described called user terminal, processor 401 judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system.
Preferably, the call request for described called user terminal of described call subscriber terminal initiation monitored by processor 401 by the application programming interface API of the wireless communication system at described call subscriber terminal place.
Preferably, described telephone exchange gateway sets up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place by the E1 interface of the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place.
In addition, the scheduling interconnected server of the present embodiment can also realize other functions in said method embodiment, repeats no more herein.
It should be noted that, device embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.In addition, in device embodiment accompanying drawing provided by the invention, the annexation between module represents to have communication connection between them, specifically can be implemented as one or more communication bus or holding wire.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required common hardware by software and realize, and can certainly comprise application-specific integrated circuit (ASIC), dedicated cpu, private memory, special components and parts etc. realize by specialized hardware.Generally, all functions completed by computer program can realize with corresponding hardware easily, and the particular hardware structure being used for realizing same function also can be diversified, such as analog circuit, digital circuit or special circuit etc.But under more susceptible for the purpose of the present invention condition, software program realizes is better execution mode.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in the storage medium that can read, as the floppy disk of computer, USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform method described in the present invention each embodiment.
Above a kind of call-establishing method, system and scheduling Interworking GateWay that the embodiment of the present invention provides are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, therefore, this description should not be construed as limitation of the present invention.
Claims (10)
1. a call-establishing method, is characterized in that, described call-establishing method is used for call set-up systems, and described call set-up systems comprises scheduling interconnected server and telephone exchange gateway, and described call-establishing method comprises:
Described scheduling interconnected server monitors the call request for called user terminal that call subscriber terminal is initiated;
Described scheduling interconnected server judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system;
If do not belong to, then described scheduling interconnected server initiates request for building link to described telephone exchange gateway, sets up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place to ask described telephone exchange gateway.
2. the method for claim 1, it is characterized in that, number home table is preserved in described scheduling interconnected server, comprise the number of each user terminal and the wireless communication system belonging to each user terminal in described number home table, in described call request, comprise the number of described called user terminal;
Described scheduling interconnected server judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system and comprise:
According to the number of described number home table and described called user terminal, described scheduling interconnected server judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system.
3. method as claimed in claim 1 or 2, it is characterized in that, described telephone exchange gateway sets up the call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place by the E1 interface of the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place.
4. a call set-up systems, described call set-up systems comprises scheduling interconnected server and telephone exchange gateway, and described scheduling interconnected server comprises:
Monitoring unit, for monitoring the call request for called user terminal that call subscriber terminal is initiated;
Judging unit, for judging whether described call subscriber terminal and described called user terminal belong to same wireless communication system;
Transmitting element, for when described call subscriber terminal and described called user terminal do not belong to same wireless communication system, initiate request for building link to described telephone exchange gateway, set up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place to ask described telephone exchange gateway.
5. system as claimed in claim 4, it is characterized in that, described scheduling interconnected server also comprises:
Memory cell, for preserving number home table, comprising the number of each user terminal and the wireless communication system belonging to each user terminal, comprising the number of described called user terminal in described call request in described number home table;
Described judging unit specifically for, the number according to described number home table and described called user terminal judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system.
6. the system as described in claim 4 or 5, it is characterized in that, described telephone exchange gateway sets up the call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place by the E1 interface of the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place.
7. dispatch an interconnected server, it is characterized in that, comprising:
Processor, for monitoring the call request for called user terminal that call subscriber terminal is initiated; Judge whether described call subscriber terminal and described called user terminal belong to same wireless communication system;
Transmitter, for when described call subscriber terminal and described called user terminal do not belong to same wireless communication system, initiate request for building link to telephone exchange gateway, set up call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place to ask described telephone exchange gateway.
8. dispatch interconnected server as claimed in claim 7, it is characterized in that, described scheduling interconnected server also comprises:
Memory, for preserving number home table, comprising the number of each user terminal and the wireless communication system belonging to each user terminal, comprising the number of described called user terminal in described call request in described number home table;
Described processor judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system and comprise:
According to the number of described number home table and described called user terminal, described processor judges whether described call subscriber terminal and described called user terminal belong to same wireless communication system.
9. dispatch interconnected server as claimed in claim 7 or 8, it is characterized in that,
Described processor monitors the call request for described called user terminal of described call subscriber terminal initiation by the application programming interface API of the wireless communication system at described call subscriber terminal place.
10. dispatch interconnected server as claimed in claim 7 or 8, it is characterized in that, described telephone exchange gateway sets up the call link between the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place by the E1 interface of the wireless communication system at described call subscriber terminal place and the wireless communication system at described called user terminal place.
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| CN103944918A (en) * | 2014-05-04 | 2014-07-23 | 海能达通信股份有限公司 | Digital trunking system and telephone system communication method, exchanger and system |
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| CN105553994A (en) * | 2015-12-22 | 2016-05-04 | 通号通信信息集团上海有限公司 | Digital wireless communication system based on voice gateway and application thereof |
| CN105553994B (en) * | 2015-12-22 | 2018-12-11 | 通号通信信息集团上海有限公司 | A kind of digit wireless communication system and its application based on voice gateways |
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