WO2018090326A1 - 数据通信的方法、装置、集群系统和中转台 - Google Patents

数据通信的方法、装置、集群系统和中转台 Download PDF

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Publication number
WO2018090326A1
WO2018090326A1 PCT/CN2016/106415 CN2016106415W WO2018090326A1 WO 2018090326 A1 WO2018090326 A1 WO 2018090326A1 CN 2016106415 W CN2016106415 W CN 2016106415W WO 2018090326 A1 WO2018090326 A1 WO 2018090326A1
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WIPO (PCT)
Prior art keywords
terminal
relay station
call request
telephone network
station
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PCT/CN2016/106415
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English (en)
French (fr)
Inventor
申娟
王婷
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海能达通信股份有限公司
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Priority to PCT/CN2016/106415 priority Critical patent/WO2018090326A1/zh
Publication of WO2018090326A1 publication Critical patent/WO2018090326A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a data communication method, apparatus, cluster system, and relay station.
  • the existing implementation scheme includes a third-party device-based implementation process and a conventional telephone solution based on the SIP protocol through the Ethernet network port.
  • the third-party device is used to implement interworking between the terminal and any telephone terminal in the telephone network.
  • the solution requires additional use of the hardware device, and the third-party device accesses the tail of the transfer station on one side and the analog phone on the other side.
  • the terminal makes a call, the terminal enters the phone number through the keyboard and is parsed by the third-party device to dial out.
  • the third-party device resolves and starts the bound transit station to transmit the access to the terminal.
  • the third-party device is not a standardized device, and the negotiation protocol of the communication protocol between the walkie-talkie manufacturer and the third-party device manufacturer is required to implement the function of the telephone terminal to dial any terminal.
  • the negotiation protocol of the communication protocol between the walkie-talkie manufacturer and the third-party device manufacturer is required to implement the function of the telephone terminal to dial any terminal.
  • the relay station acts as a SIP proxy, and the terminal communicates with the bound relay station, and the terminal and the telephone terminal communicate with each other under the action of the relay station.
  • the terminal can only make calls under a fixed transfer station. Once roaming to other transfer stations, the voice can only be transmitted through the network to the bound transfer station through the IP internet.
  • the bound transit air interface is transmitted to the terminal, which occupies a large amount of network resources and air interface resources.
  • the terminal in the interworking between the existing terminal and the telephone network, regardless of the implementation scheme, the terminal can only use the channel resources provided by the bound relay station, and thus brings a very high cost, such as very high. Hardware cost, a large amount of resources, etc., and can not achieve roaming throughout the network.
  • a method of data communication wherein the method is performed by a relay station of a cluster system, and includes the following steps:
  • the repeater receives a telephone call request initiated by the terminal
  • the relay station After receiving the confirmation response of the public telephone network sent by the agent relay station, the relay station receives voice data sent by the public telephone network, and establishes a voice between the terminal and the public telephone network. data transmission.
  • the proxy forwarding station that queries the terminal includes:
  • the network entity that manages the agent transfer station information is queried to obtain the agent transfer station of the terminal.
  • the method further includes:
  • the voice data transmission is terminated when the session termination request command sent by the proxy relay station is received.
  • the method further includes:
  • the relay station receives a telephone call request initiated by the public telephone network to the terminal;
  • the method further includes:
  • the terminal that sends the call to the other relay station When receiving the telephone call request sent by the other relay station in the cluster system, and when the idle station is in an idle state, the terminal that sends the call to the other relay station requests the call to send a notification message;
  • a method of data communication comprising the following steps:
  • the relay station receives a telephone call request sent by another relay station in the cluster system, the telephone call request is a call request sent to the public telephone network, and the transfer station is an agent transfer station of the terminal that initiates the telephone call request;
  • a device for data communication the device being built in any of the relay stations of the cluster system, the device comprising:
  • a first receiving unit configured to receive a phone call request initiated by the terminal
  • a determining unit configured to determine, when the phone call request is a call request to the public telephone network, whether the relay station is the agent transfer station of the terminal, and if not,
  • a searching unit configured to query a proxy relay station of the terminal, and send the telephone call request to the proxy relay station;
  • a first transmission establishing unit configured to receive voice information sent by the public telephone network after receiving an acknowledgement response of the public telephone network sent by the proxy relay station, and establish the terminal and the public telephone network Voice data transmission between.
  • the searching unit comprises:
  • a first searching unit configured to broadcast a query message, query a proxy relay station of the terminal, receive a response from the other relay station to the broadcast query message, and determine a proxy transfer station of the terminal according to the response of the broadcast query message ;
  • a second searching unit configured to read the agent transfer station setting information configured by itself, and obtain the agent transfer station of the terminal;
  • a third searching unit configured to query a network entity that manages the relay station information, and obtain an agent relay station of the terminal.
  • the apparatus further includes:
  • a first busy processing unit configured to receive a telephone call request initiated by the public telephone network to the terminal; the transit station forwards the telephone call request to an idle transfer station in the cluster system when in a busy state; Receiving, by the relay station, a response message sent by the idle relay station, where the response message is sent after the idle relay station initiates a call to the terminal, and after receiving the response message sent by the terminal; The response message is converted into a SIP request, and the SIP request is sent to the telephone network; the relay station sends the idle relay station address to the public telephone network, and the idle relay station is designated to carry voice;
  • a second busy processing unit configured to: when receiving a telephone call request sent by another relay station in the cluster system, and in an idle state, send a notification message to a terminal that calls the call sent by the other relay station; After receiving the response from the terminal of the telephone call requesting call sent by the other relay station, the SIP request is sent to the telephone network; and the voice data transmission between the public telephone network and the terminal is established.
  • a device for data communication the device being built in any of the relay stations of the cluster system, the device comprising:
  • a second receiving unit configured to receive a phone call request sent by another relay station in the cluster system, where the phone call request is a call request to a public telephone network, and the transfer station is a terminal that initiates the phone call request Agent transfer station;
  • a converting unit configured to convert the telephone call request into a SIP request, and send the location to the public telephone network Said SIP request;
  • a second transmission establishing unit configured to receive a target telephone status message sent by the public telephone network, and forward the message to the relay station that sends the telephone call request, if the target telephone status message is a success response message of the SIP request And completing the session creation; sending the address of the relay station of the telephone call request to the public telephone network, and designating the relay station that sends the telephone call request as the voice bearer in the session.
  • a cluster system comprising a plurality of relay stations connected together and a terminal active under any one of the transfer stations, wherein the agent terminal registers in the public telephone network, and is a proxy transfer station of the terminal, wherein:
  • the terminal is configured to initiate a phone call request
  • the relay station is configured to receive a telephone call request initiated by the terminal; when the call request is parsed as a call request to the public telephone network, determine whether the relay station is the proxy transfer station of the terminal, if No, querying the proxy relay station of the terminal, and sending the telephone call request to the proxy relay station; after receiving the confirmation response of the public telephone network sent by the proxy relay station, the transfer station Receiving voice information sent by the public telephone network, and establishing voice data transmission between the terminal and the public telephone network; and receiving a telephone call request sent by another relay station in the cluster system, the telephone call request
  • the relay station is a proxy relay station of the terminal that initiated the telephone call request; converts the telephone call request into a SIP request, and sends the SIP request to the public telephone network; Receiving a target telephone status message sent by the public telephone network, and forwarding to the relay station that sends the telephone call request,
  • the target phone status message is a success response message of the SIP request, and the session creation is completed; the address of
  • a relay station includes at least one processor, at least one mobile communication radio frequency component, a memory, and at least one communication bus, wherein the memory stores program code, and the processor is configured to invoke program code stored in the memory for execution The following operations:
  • the relay station After receiving the confirmation response of the public telephone network sent by the agent relay station, the relay station receives voice information sent by the public telephone network, and establishes a voice between the terminal and the public telephone network. data transmission.
  • a relay station includes at least one processor, at least one mobile communication radio frequency component, a memory, and at least one communication bus, wherein the memory stores program code, and the processor is configured to invoke program code stored in the memory for execution The following operations:
  • the relay station receives a telephone call request sent by another relay station in the cluster system, the telephone call request is a call request sent to the public telephone network, and the transfer station is an agent transfer station of the terminal that initiates the telephone call request;
  • the relay station of the cluster system receives the telephone call request initiated by the terminal, and when the call request is parsed as a call request to the public telephone network, it is determined whether the relay station is the proxy terminal station of the terminal, if Otherwise, the agent transfer station of the terminal is queried, and a telephone call request is sent to the agent transfer station. After receiving the confirmation application of the public telephone network sent by the agent transfer station, the transfer station receives the voice data sent by the public telephone network, and establishes the terminal.
  • the voice data transmission between the public telephone network and the public telephone network enables the terminal to interconnect the telephone network through the relay station under any relay station, thereby realizing the whole network roaming of the terminal, and there is no additional hardware setting addition or channel resource occupation. Therefore, it will not cause a high price.
  • FIG. 1 is a flow chart of a method of data communication in an embodiment
  • FIG. 2 is a flow chart of a method of data communication in another embodiment
  • FIG. 3 is a flow chart of a method of data communication in another embodiment
  • FIG. 4 is a flow chart of a method of data communication performed by a repeater of a cluster system in another embodiment
  • FIG. 5 is an interconnection topology diagram between a cluster system and a telephone network in an embodiment
  • FIG. 6 is a schematic diagram of a network topology of a trunked system interconnected telephone network with a terminal as the calling side in an embodiment
  • FIG. 7 is a sequence diagram of the terminal in FIG. 6 roaming to Repeater 1 to initiate a telephone call request;
  • FIG. 8 is a schematic diagram of a network topology of a trunked telephone network of a cluster system in which the terminal is the called side;
  • FIG. 9 is a sequence diagram of a terminal in which the proxy repeater is busy when the proxy repeater is busy in FIG. 8;
  • FIG. 10 is a schematic structural diagram of an apparatus for data communication in an embodiment
  • FIG. 11 is a schematic structural diagram of an apparatus for data communication in another embodiment
  • FIG. 12 is a schematic structural diagram of an apparatus for data communication in another embodiment
  • FIG. 13 is a schematic structural diagram of a terminal in an embodiment of the present invention.
  • the terminal is not fixed and often moves from one transit station to another. Therefore, in actual use, the terminal is not likely to be active only under the bound transit station. How to realize the whole network roaming of the terminal will become an important problem to be solved urgently in the terminal telephone function in the cluster system.
  • the present invention provides a method for data communication. As shown in FIG. 1, in one embodiment, the method is performed by a relay station of a cluster system, and includes the following steps:
  • Step 110 The relay station receives a telephone call request initiated by the terminal.
  • the terminal may be in a roaming state, that is, the terminal may not be active in its bound transit station, ie, under the agent relay station, but in any other turntable in the cluster system. .
  • the terminal in the roaming state initiates a telephone call request as the calling side, it will initiate a telephone call request to the station in which it is located.
  • each terminal has a corresponding relationship with a relay station, that is, an agent relay station, through registration of the terminal.
  • a relay station that is, an agent relay station
  • the terminal user group includes a plurality of terminals, and the terminals have a corresponding relationship with the transfer station, and the transfer station is Agent repeater for these terminals.
  • the terminal preferentially activates and initiates a telephone call in its agent relay station to ensure the fastest access to the system and reduce the waiting time. If the terminal roams to another relay station and is active under another relay station, it can only transfer to this terminal. The station initiates a telephone call request, and the repeater then forwards the telephone call request to the agent's relay station of the terminal.
  • the relay station that receives the telephone call request is any relay station of the cluster system, wherein the relay station may be the agent relay station of the terminal, or may be another relay station in the cluster system.
  • any relay station can be used to implement terminal access, and only the terminal needs to be active under it, and is not limited to the agent relay station of the terminal.
  • Step 130 When parsing the call request for the call to the public telephone network, determine whether the repeater is the proxy repeater of the terminal. If no, go to step 150. If yes, go to step 190.
  • Each repeater station pre-designates one or more end user groups, and any terminal in the cluster system belongs to the end user group specified by a transfer station, and this transfer station will be the agent transfer station of the terminal. .
  • the repeater determines whether the transfer station is the agent transfer station of the terminal, and if so, directly Go to step 190.
  • the agent relay station of the terminal needs to be queried, and the establishment of the voice data transmission between the terminal and the public telephone network is realized under the action of the agent transfer station.
  • Step 150 Query the proxy relay station of the terminal, and send a telephone call request to the proxy relay station.
  • the relay station that receives the telephone call request broadcasts in the cluster system, that is, broadcasts the inquiry message, and if the relay station that receives the inquiry message is the agent terminal station of the terminal, the relay station will respond to the inquiry message.
  • the relay station that receives the telephone call request is informed, and the telephone call request is forwarded to the agent relay station, and the agent relay station performs session control.
  • Step 170 After receiving the confirmation response of the public telephone network sent by the agent relay station, the relay station receives the voice data sent by the public telephone network, and establishes voice data transmission between the terminal and the public telephone network.
  • the proxy repeater After receiving the telephone call request, the proxy repeater creates a session according to the telephone call request and specifies the repeater as the voice bearer in the session, so that the repeater can receive the request data sent by the public telephone network, and establish the terminal and the public telephone network. Voice data transmission between.
  • the proxy repeater is used for session control of its corresponding terminal. Specifically, after receiving a telephone call request forwarded by another repeater, the session will be created for the terminal.
  • the session creation by the agent transfer station according to the telephone call request will be a process of initiating a request and response between the agent transfer station and the telephone network.
  • the telephone network response obtained by the agent transfer station is also forwarded to the transfer station, so as to facilitate Transmitting it to the terminal via the relay station, so that the terminal can know the status of the current target telephone terminal in the initiated telephone call, for example, telling the terminal that the current target telephone terminal has ringed, or telling the terminal that the current target telephone terminal is Ask the user to pick up the phone.
  • the agent repeater will specify the voice bearer in the session created by the repeater where the terminal is located. That is to say, in the process in which the terminal talks with the target telephone terminal in the telephone network, the relay station where the designated terminal is located carries the voice data generated in real time during the call, so as to realize the transmission of voice data between the terminal and the telephone network.
  • the proxy relay station creates a session, and the call connection can be established with the telephone network through the relay station.
  • the terminal and the target telephone terminal in the telephone network are connected, and thereafter the voice data output by the terminal is transmitted to the telephone network via the relay station, and the voice data output by the target telephone terminal is also passed by the telephone network.
  • the relay station transmits to the terminal, thereby realizing real-time transmission of voice between the terminal and the target telephone terminal.
  • Step 190 the proxy relay station establishes voice data transmission between the terminal and the public telephone network according to the telephone call request.
  • the terminal roams to the relay station under which the activity is active, realizing the real-time transmission of the voice data in the telephone function, thereby ensuring the telephone function of the roaming terminal, thereby causing the terminal in the cluster system to roam to any transit.
  • the voice data sent and received by the terminal is carried by the relay station, and is no longer limited to the voice data transmission between the agent relay station and the terminal, and is not required to be obtained by the agent transfer station through the air interface channel, and is optimized.
  • the utilization of the air interface channel resources reduces the occupied air interface channel resources, reduces the cost, and avoids the terminal roaming restriction.
  • step 150 the proxy forwarding station of the terminal is queried, including:
  • the broadcast sending query message is used to query the proxy relay station of the terminal; receive the response of the other relay station to the broadcast query message, and determine the proxy transfer station of the terminal according to the response of the broadcast query message; or
  • the network entity that manages the agent transfer station information is queried to obtain the agent transfer station of the terminal.
  • the relay station receiving the telephone call request is broadcasted in the cluster system to inquire with other relay stations whether it is the agent transfer station of the terminal, so that the agent transfer station of the request terminal is processed by the terminal. Telephone call request.
  • the relay station of the terminal exists in the other relay stations in the cluster system, and the agent relay station will respond to the query message after receiving the query message.
  • the interconnection between the terminal and the telephone network can be realized for any terminal that is active under the relay station, and is no longer limited to the terminal under the proxy relay station, while saving the air interface channel resources of the relay station,
  • the communication performance of the repeater is enhanced and the flexibility of resource allocation in the cluster system is improved.
  • the method further comprises terminating the voice data transmission upon receiving the session termination request command sent by the proxy relay station.
  • voice data transmission control will be implemented by the agent relay station, and the actual transmission of voice data is implemented by other relay stations.
  • the session termination request command will be triggered when the calling side and the called side of the called side hang up during the call.
  • the session termination request command is a BYE request command.
  • the telephone network or the terminal transmits a session termination request command to the proxy relay station to trigger the proxy relay station to release the voice data transmission, terminate the transmission of the voice data, and end the call.
  • the method further includes:
  • Step 210 The relay station receives a telephone call request initiated by the public telephone network to the terminal.
  • step 230 the repeater forwards the telephone call request to the idle repeater in the cluster system while in the busy state.
  • Step 250 The relay station receives the response message sent by the idle relay station, and the response message is sent after the idle relay station initiates the call to the terminal, and receives the response message sent by the terminal.
  • step 270 the repeater converts the response message into a SIP request and sends a SIP request to the telephone network.
  • step 290 the relay station sends the idle relay station address to the public telephone network, and the idle relay station transmits the voice.
  • the cluster system is interconnected with the telephone network, thereby enabling its communication with any telephone terminal in the telephone network.
  • the cluster system includes a plurality of relay stations that are grouped together, each of which has a designated terminal user group, the terminal user group includes a plurality of terminals, and any terminal may be a transit station to which it belongs, that is, The agent relays the activity under the station and talks with any telephone terminal in the telephone network. It can also be active under other relay stations, that is, in the roaming state, through other relay stations, to talk to any telephone terminal in the telephone network.
  • the terminal in the cluster system can access the communication under any relay station, which reduces the waiting time required for terminal access, and maximizes the communication capacity of the system under the premise of ensuring the quality of the service. Any of the terminals can make calls as quickly and efficiently as possible.
  • the method further includes:
  • Step 310 When receiving the telephone call request sent by the other relay station in the cluster system, and the idle station is in the idle state, the terminal that sends the call to the other transfer station requests the call to send the notification message.
  • the telephone terminal is the calling side, and the terminal is the called side.
  • the proxy relay station of the terminal in the cluster system will receive the telephone call request and send a telephone call request to the relay station. That is to say, the other transfer station referred to is the agent transfer station of the terminal.
  • the agent repeater After receiving the phone call request, the agent repeater first determines whether it is in a busy state. If yes, it indicates that the time slot of the agent transfer station is occupied by other services, and thus the phone function cannot be realized. Therefore, the agent transfer station in a busy state Forward the phone call request to an idle repeater of the cluster system.
  • the relay station sends a notification message according to the received telephone call request.
  • the notification message may be a ringing message, causing the called terminal to ring to notify the user to pick up the phone and answer the call.
  • Step 330 After receiving a response from the terminal of the telephone call requesting the call sent by the other repeater, the SIP request is sent to the telephone network.
  • the repeater After receiving the telephone call request forwarded by the proxy relay station, the repeater converts the telephone call request into a ringing message and initiates a call to the terminal.
  • the terminal that received the ringing message rings to notify and wait for the user of the terminal to pick up.
  • the user of the terminal When the user of the terminal picks up the phone and connects the initiated call, the user responds to the transfer station by the operation triggered by the terminal, that is, returns a response message to the transfer station, and the response is forwarded by the transfer station to the agent transfer station, and then the agent The transfer station is finally converted into a SIP request.
  • the terminal implements a response by triggering dialing, and the response includes an access code input by the terminal.
  • the relay station verifies the response of the terminal to determine whether the access code of the response is correct. If it is correct, it sends a response message to the agent relay station.
  • Step 350 establishing a voice data transmission between the public telephone network and the terminal.
  • a call connection between the telephone network and the idle repeater is established under the action of the proxy repeater to specify that the idle repeater carries the voice that implements the telephone function, between the terminal and the telephone network.
  • the voice data is forwarded separately by the idle repeater.
  • the telephone function of the terminal is not limited due to the limited channel resources of the agent transfer station, and the telephone function is prevented from being used when the agent transfer station is busy, thereby improving the reliability of the terminal telephone function. Sex and stability.
  • an existing repeater has only two time slots, and can only support up to two phones at a time, and once the time slot is occupied by its service, the phone function cannot be used, and channel sharing in the cluster system cannot be realized, resulting in The waste of channel resources, through the process as described above, is less restrictive and convenient.
  • the terminal realizes the call with the telephone terminal through communication with an idle relay station in the cluster system, thereby avoiding the telephone function when the terminal is busy in the agent transfer station. Limit, to ensure the stability of the phone function in the terminal.
  • the terminal can roam to any transfer station, and the function of making or receiving a call can be realized under any transfer station, which greatly improves the reliability of the telephone function in the terminal.
  • a method of data communication is performed by a relay station of a cluster system, as shown in FIG. 4, and includes the following steps:
  • Step 410 The relay station receives a telephone call request sent by another relay station in the cluster system.
  • the telephone call request is a call request sent to the public telephone network
  • the transfer station is a proxy transfer station of the terminal that initiates the telephone call request.
  • step 430 the telephone call request is converted into a SIP request, and a SIP request is sent to the public telephone network.
  • a terminal that initiates a telephone call request to a relay station the proxy relay station will receive a telephone call request forwarded by the relay station, convert the telephone call request into a SIP request, and then send it to the telephone network to make the target in the telephone network
  • the telephone terminal responds to the telephone call initiated by the terminal.
  • the SIP request includes a source terminal and a destination terminal for a telephone call, and is used to specify a call direction. For example, if the SIP request includes From:5001/To:110, the source terminal of the telephone call is the terminal number 5001, and the destination terminal is the telephone terminal of the telephone number 110.
  • Step 450 Receive a target phone status message sent by the public telephone network, and forward the message to the relay station that sends the phone call request. If the target phone status message is a SIP response success response message, complete the session creation.
  • the target telephone status message sent by the telephone network is used to indicate the status of the target telephone terminal after receiving the SIP request, and therefore, the target telephone status message includes a ringing status message and a success response message, wherein the ringing status message is used to feed back the target
  • the telephone terminal has ringed to realize the notification of the calling side telephone call, waiting for the called party to pick up the call; the success response message is sent when the called party picks up the call.
  • the ringing status message can be 180 Ringing and the success response message can be 200 OK.
  • the telephone network After receiving the SIP request sent by the proxy relay station, the telephone network sends a ringing message to the target telephone terminal according to the SIP request, so that the target telephone terminal that is the called side rings, and waits for the user to pick up the call.
  • the telephone network will feed back the ringing status message to the agent relay station, thereby forwarding the ringing status message to the relay station where the terminal is located through the agent relay station, and notifying the user of the terminal of the call initiated by the terminal.
  • the call has been routed to the called side and the called party is ringing.
  • the target telephone terminal sends a success response message through the telephone network to make the called party call the terminal. The final response.
  • the session creation between the terminal and the target telephone terminal is performed, and the success response message is the final response of the called party to the telephone call request.
  • the receipt of the success response message in the proxy repeater illustrates the completion of the session creation between the terminal and the target telephone terminal.
  • Step 470 Send the address of the repeater station of the telephone call request to the public telephone network, and specify the repeater station that sends the telephone call request as the voice bearer in the session.
  • the relay station where the proxy relay station is located is the voice bearer in the session, and the proxy relay station no longer carries the voice between the terminal in the session and the target telephone terminal.
  • the session is also realized.
  • the separation of control and voice transmission that is, the separation of SIP sessions and RTP voice streams, and deployment on different transit stations, achieves a balanced network load of the cluster system.
  • the interconnection topology between the cluster system and the telephone network is as shown in FIG. 5, wherein the cluster system 510 and the telephone network 530 respectively perform session control through the SIP protocol, and real-time voice transmission is performed through the RTP protocol.
  • the telephone network 530 includes an IPPBX (Network Address Based Telephone System) 531 and a plurality of telephone terminals 533.
  • IPPBX Network Address Based Telephone System
  • the range covered by the base station 511 is divided into a plurality of areas, and the same area may be provided with a plurality of repeating stations 513, which are grouped together to form a station, so that the terminal 515 is allowed to use all the relays in the station.
  • Station 513 communicates, avoiding the setting of proprietary control channels, increasing channel utilization, and maximizing communication capacity.
  • any of the terminals 515 of the cluster system 510, the extension number used by the terminal 515 is registered in the telephone network 530 through a designated relay station 513, whereby the relay station 513 for realizing the registration of the terminal 515 is the terminal. 515 agent transfer station.
  • the registered extension number is bound to the IP address, and the terminal 515 can make or receive the telephone service only under the relay station 513 registered by the proxy, and is maintained by the relay station 513 registered by the proxy.
  • the relay station 513 when receiving the telephone call initiated by the terminal 515 that is not registered by the agent itself, the relay station 513 sends a telephone call request to the proxy relay station, and the proxy relay station initiates the session, and the voice bearer is designated as the terminal 515.
  • the terminal 515 can make a call under any channel of any relay station 513 to implement the full-network roaming function of the terminal telephone service.
  • the terminal 515 is dialed by the telephone terminal 531, if the agent relay station is in a busy state, the agent relay station will transmit the telephone call request to the idle relay station in the cluster system 510, and the idle relay station carries the voice to implement the system. Telephone channel sharing.
  • FIG. 6 is a schematic diagram showing the network topology of the trunked system telephone network of the cluster terminal on the calling side.
  • the set of the repeater includes the Repeater1, the Repeater2, and the Repeater3, which are respectively configured under the Switcher interconnected with the IPPBX to provide access services for each terminal.
  • the proxy repeater of terminal 620 with extension number 5000 is Repeater3, but it is active under Repeater1. Therefore, when the terminal 620 initiates a telephone call, that is, when performing step 1a, the Repeater 1 receives the telephone call request and finds that the terminal 620 is not registered by itself, and sends the telephone call request to the proxy repeater Repeater 3, Repeater 3 and the telephone IPPBX. Negotiate to establish a session and specify Repeater1 as the bearer for voice. IPPBX sends the voice of the telephone terminal to Repeater1, and Repeater1 forwards it to the terminal with the extension number 5000 on the air interface.
  • FIG. 7 shows the entire sequence process of the terminal roaming to Repeater1 to initiate a telephone call request.
  • FIG. 8 is a schematic diagram showing the network topology of a trunked system interconnected telephone network in which the terminal is the called side.
  • FIG. 9 shows the entire sequence process of the proxy repeater, that is, the Repeater 3 calls the terminal registered by the agent when it is busy.
  • the process of interconnecting the terminal and the telephone network as described above is implemented based on the SIP protocol. Since the SIP protocol has been widely used in various voice and video communication fields, the hardware devices are mature, reliable, and selective, and are deployed when the telephone network is set up. Simple and versatile. Different repeaters can be connected to the same telephone system or connected to different telephone systems, saving hardware costs and increasing system capacity. What is not the connection with existing third-party equipment is that it can not only realize analog telephones. Interoperability can also achieve interoperability with digital phones, and subsequent scalability is strong.
  • the process of interconnecting the terminal and the telephone network as described above realizes channel sharing and roaming throughout the network without adding any other auxiliary function devices or protocols, and has low cost and good experience. Maximize resource configuration and limit ease of use.
  • a device for data communication is built in any of the repeating stations of the cluster system, and includes: a first receiving unit 910, a determining unit 930, a searching unit 950, and a A transmission establishing unit 970.
  • the first receiving unit 910 is configured to receive a phone call request initiated by the terminal.
  • the determining unit 930 is configured to: when parsing the call request for the call to the public telephone network, Whether the relay station is the proxy relay station of the terminal, and if not, the proxy relay station establishes voice data transmission between the terminal and the public telephone network according to the telephone call request.
  • the searching unit 950 is configured to query the proxy relay station of the terminal, and send a telephone call request to the proxy relay station.
  • the first transmission establishing unit 970 is configured to receive the voice information sent by the public telephone network after receiving the confirmation response of the public telephone network sent by the agent relay station, and establish a voice data transmission between the terminal and the public telephone network.
  • the searching unit 950 includes: a first searching unit or a second searching unit or a third searching unit.
  • a first searching unit configured to broadcast a query message, query a proxy relay station of the terminal, receive a response from the other relay station to the broadcast query message, and determine a proxy transfer station of the terminal according to the response of the broadcast query message;
  • a second searching unit configured to read the agent transfer station setting information configured by itself, and obtain the agent transfer station of the terminal;
  • the third searching unit is configured to query the network entity that manages the relay station information, and acquire the proxy relay station of the terminal.
  • an apparatus for data communication includes a first busy processing unit 1010 and a second busy processing unit 1030.
  • the first busy processing unit 1010 is configured to receive a telephone call request initiated by the public telephone network to the terminal; the transfer station forwards the telephone call request to the idle transfer station in the cluster system when the busy station is in a busy state; and the transfer station receives the idle transfer station to send the The response message is sent after the idle repeater initiates a call to the terminal, and after receiving the response message sent by the terminal; the relay station converts the response message into a SIP request, and sends a SIP request to the telephone network; the relay station will idle the repeater address Send to the public telephone network, and specify the idle repeater to carry the voice;
  • the second busy processing unit 1030 is configured to: when receiving a telephone call request sent by another relay station in the cluster system, and in an idle state, send a notification message to the terminal that requests the call to the other mobile station to send the call; After the telephone call sent by the repeater calls the response of the terminal feedback, the SIP request is sent to the telephone network; the voice data transmission between the public telephone network and the terminal is established.
  • a device for data communication is built in any of the repeaters of the cluster system. As shown in FIG. 12, the device includes: a second receiving unit 1110, a converting unit 1130, and a second transmission establishing unit 1150. .
  • the second receiving unit 1110 is configured to receive a telephone call request sent by another relay station in the cluster system, where the telephone call request is a call request to the public telephone network, and the transfer station is a proxy transfer station of the terminal that initiates the telephone call request.
  • the converting unit 1130 is configured to convert the phone call request into a SIP request, and send a SIP request to the public telephone network.
  • a second transmission establishing unit 1150 configured to receive a target telephone status message sent by the public telephone network, and forward the message to the relay station that sends the telephone call request, and complete the session creation if the target telephone status message is a successful response message of the SIP request;
  • the public telephone network sends the address of the repeater of the telephone call request, and specifies that the repeater that sends the telephone call request is the voice bearer in the session.
  • a cluster system includes a plurality of relay stations connected together and a terminal that is active under any of the relay stations, and the relay terminal that the agent terminal registers in the public telephone network is a proxy transfer station of the terminal, wherein :
  • the terminal is used to initiate a telephone call request
  • the relay station is configured to receive a telephone call request initiated by the terminal; when parsing the telephone call request as a call request to the public telephone network, determine whether the relay station is the proxy transfer station of the terminal, and if not, query the agent of the terminal.
  • the transfer station sends a telephone call request to the agent transfer station; after receiving the confirmation response from the public telephone network sent by the agent transfer station, the transfer station receives the voice information sent by the public telephone network and establishes a relationship between the terminal and the public telephone network.
  • the telephone call request is a call request to the public telephone network
  • the transfer station is a proxy transfer station of the terminal that initiates the telephone call request
  • the telephone call request is made Translating into a SIP request, sending a SIP request to the public telephone network
  • receiving a target telephone status message sent by the public telephone network and forwarding to the relay station that sent the telephone call request, if the target telephone status message is a successful response message of the SIP request, completing Session creation
  • send a call to the public telephone network Repeater address request specifies a telephone call request to the relay station carrying voice conversation.
  • FIG. 13 is a schematic structural diagram of a terminal in an embodiment of the present invention, where the terminal 1800 may include: at least one location
  • the communication bus 1802 is used to implement connection communication between these components.
  • the memory 1804 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.
  • the memory 1804 can optionally also be at least one storage device located remotely from the aforementioned processor 1801.
  • a set of program codes is stored in the memory 1804, and the processor 1801 is configured to call program code stored in the memory for performing the following operations:
  • the relay station After receiving the confirmation response of the public telephone network sent by the agent relay station, the relay station receives voice information sent by the public telephone network, and establishes a voice between the terminal and the public telephone network. data transmission.
  • a relay station includes at least one processor, at least one mobile communication radio frequency component, a memory, and at least one communication bus, wherein the memory stores program code, and the processor is configured to call the memory storage Program code for doing the following:
  • the relay station receives a telephone call request sent by another relay station in the cluster system, the telephone call request is a call request sent to the public telephone network, and the transfer station is an agent transfer station of the terminal that initiates the telephone call request;
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

Abstract

本发明提供了一种数据通信的方法，所述方法由集群系统的中转台执行，包括：中转台接收终端发起的电话呼叫请求；在解析出所述电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为所述终端的代理中转台，若为否，则查询所述终端的代理中转台，并向所述代理中转台发送所述电话呼叫请求；在收到所述代理中转台发送的所述公共电话网络的确认应答之后，所述中转台接收所述公共电话网络发送的语音数据，并建立所述终端和所述公共电话网络之间的语音数据传输。。此外，还提供了一种数据通信的装置、集群系统和中转台。上述电数据通信的方法、装置、集群系统和中转台能够实现终端的全网漫游，且不会造成高昂的代价。

Description

数据通信的方法、装置、集群系统和中转台 技术领域
本发明涉及通信技术领域，特别涉及一种数据通信的方法、装置、集群系统和中转台。
背景技术
为实现终端与电话终端之间的实时语音通话，在现有的实现方案中包括了基于第三方设备的实现过程和基于SIP协议通过Ethernet网口链接的常规电话方案。
一方面的，借助第三方设备实现终端与电话网络中任意电话终端的互通，该方案需要额外地使用硬件设备，第三方设备一侧接入中转台尾针，另一侧则接入到模拟电话口，当终端拨打电话时通过键盘输入电话号码并由第三方设备解析后拨打出去，当有终端被叫时，由该第三方设备解析并启动绑定的中转台发射接入到终端。
然而，第三方设备并不是一个标准化设备，需要对讲机厂商与第三方设备厂商之间进行通信协议的协商方可实现电话终端拨打任意终端的功能。在组网时将必须为每台中转台配备一第三方设备，带来了非常大的硬件成本，并且终端只能由绑定的中转台接入。
另一方面的，基于SIP协议的常规电话方案中，中转台作为SIP代理，终端与绑定的中转台通信，并且在中转台的作用下实现终端与电话终端的互通。
但是，在此过程中，终端只能够在固定的中转台下拨打电话，一旦漫游到其它的中转台下，则只能通过IP互联网络将电话语音通过网络传输到绑定的中转台下，由绑定的中转台空口传输至终端，从而大量占用了网络资源和空口资源。
也就是说，现有的终端与电话网络的互通中，无论采用何种实现方案，终端都只能使用绑定的中转台所提供的信道资源，且由此带来非常高的代价，诸如非常高的硬件成本、大量的资源占用等，并且无法实现全网漫游。
发明内容
基于此，有必要提供一种数据通信的方法、装置、集群系统和中转台，所述方法和装置能够实现终端的全网漫游，且不会造成高昂的代价。
为解决上述技术问题，将采用如下技术方案：
一种数据通信的方法，其特征在于，所述方法由集群系统的中转台执行，包括如下步骤：
中转台接收终端发起的电话呼叫请求；
在解析出所述电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为所述终端的代理中转台，若为否，则
查询所述终端的代理中转台，并向所述代理中转台发送所述电话呼叫请求；
在收到所述代理中转台发送的所述公共电话网络的确认应答之后，所述中转台接收所述公共电话网络发送的语音数据，并建立所述终端和所述公共电话网络之间的语音数据传输。
在其中一个实施例中，所述查询所述终端的代理中转台包括：
广播发送查询消息，用于查询所述终端的代理中转台；接收其它中转台对所述广播查询消息的应答，根据所述广播查询消息的应答确定所述终端的代理中转台；或
读取自身配置的代理中转台设置信息，获取所述终端的代理中转台；或
向管理代理中转台信息的网络实体查询，获取所述终端的代理中转台。
在其中一个实施例中，所述方法还包括：
接收到所述代理中转台发送的会话终止请求命令时，终止所述语音数据传输。
在其中一个实施例中，所述方法还包括：
所述中转台接收所述公共电话网络向终端发起的电话呼叫请求；
所述中转台在处于繁忙状态时将所述电话呼叫请求转发至所述集群系统中的空闲中转台；
所述中转台接收所述空闲中转台发送的响应消息，所述响应消息为所述空闲中转台向所述终端发起呼叫后，接收到所述终端发送的响应消息后发送的；
所述中转台将所述响应消息转换为SIP请求，向所述电话网络发送所述SIP请求；
所述中转台将所述空闲中转台地址发送给公共电话网络，指定所述空闲中转台承载 语音。
在其中一个实施例中，所述方法还包括：
所述中转台在接收到所述集群系统中其他中转台发送的电话呼叫请求，且处于空闲状态时，向所述其他中转台发送的电话呼叫请求呼叫的终端发送通知消息；
在收到所述其他中转台发送的电话呼叫请求呼叫的终端反馈的应答后，再向所述电话网络发送所述SIP请求；
建立所述公共电话网络和终端之间语音数据传输。
一种数据通信的方法，所述方法由集群系统的中转台执行，包括如下步骤：
中转台接收所述集群系统中其他中转台发送的电话呼叫请求，所述电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起所述电话呼叫请求的终端的代理中转台；
将所述电话呼叫请求转化为SIP请求，向所述公共电话网络发送所述SIP请求；
接收所述公共电话网络发送的目标电话状态消息，并向发送所述电话呼叫请求的中转台转发，若所述目标电话状态消息为所述SIP请求的成功响应消息，则完成会话创建；
向所述公共电话网络发送所述电话呼叫请求的中转台的地址，指定发送所述电话呼叫请求的中转台为所述会话中的语音承载。
一种数据通信的装置，所述装置内置于集群系统的任一中转台，所述装置包括：
第一接收单元，用于接收终端发起的电话呼叫请求；
判断单元，用于在解析出所述电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为所述终端的代理中转台，若为否，则
查找单元，用于查询所述终端的代理中转台，并向所述代理中转台发送所述电话呼叫请求；
第一传输建立单元，用于在收到所述代理中转台发送的所述公共电话网络的确认应答之后，接收所述公共电话网络发送的语音信息，并建立所述终端和所述公共电话网络之间的语音数据传输。
在其中一个实施例中，所述查找单元包括：
第一查找单元，用于广播发送查询消息，查询所述终端的代理中转台；接收其它中转台对所述广播查询消息的应答，根据所述广播查询消息的应答确定所述终端的代理中转台；或
第二查找单元，用于读取自身配置的代理中转台设置信息，获取所述终端的代理中转台；或
第三查找单元，用于向管理代理中转台信息的网络实体查询，获取所述终端的代理中转台。
在其中一个实施例中，所述装置还包括：
第一繁忙处理单元，用于接收所述公共电话网络向终端发起的电话呼叫请求；所述中转台在处于繁忙状态时将所述电话呼叫请求转发至所述集群系统中的空闲中转台；所述中转台接收所述空闲中转台发送的响应消息，所述响应消息为所述空闲中转台向所述终端发起呼叫后，接收到所述终端发送的响应消息后发送的；所述中转台将所述响应消息转换为SIP请求，向所述电话网络发送所述SIP请求；所述中转台将所述空闲中转台地址发送给公共电话网络，指定所述空闲中转台承载语音；
第二繁忙处理单元，用于在接收到所述集群系统中其他中转台发送的电话呼叫请求，且处于空闲状态时，向所述其他中转台发送的电话呼叫请求呼叫的终端发送通知消息；在收到所述其他中转台发送的电话呼叫请求呼叫的终端反馈的应答后，再向所述电话网络发送所述SIP请求；建立所述公共电话网络和终端之间语音数据传输。。
一种数据通信的装置，所述装置内置于集群系统的任一中转台，所述装置包括：
第二接收单元，用于接收所述集群系统中其他中转台发送的电话呼叫请求，所述电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起所述电话呼叫请求的终端的代理中转台；
转化单元，用于将所述电话呼叫请求转化为SIP请求，向所述公共电话网络发送所 述SIP请求；
第二传输建立单元，用于接收所述公共电话网络发送的目标电话状态消息，并向发送所述电话呼叫请求的中转台转发，若所述目标电话状态消息为所述SIP请求的成功响应消息，则完成会话创建；向所述公共电话网络发送所述电话呼叫请求的中转台的地址，指定发送所述电话呼叫请求的中转台为所述会话中的语音承载。
一种集群系统，包括连接在一起的多台中转台和活动在所述任一中转台下的终端，代理终端在公共电话网络进行注册的中转台，为所述终端的代理中转台，其中：
所述终端，用于发起电话呼叫请求；
所述中转台，用于接收终端发起的电话呼叫请求；在解析出所述电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为所述终端的代理中转台，若为否，则查询所述终端的代理中转台，并向所述代理中转台发送所述电话呼叫请求；在收到所述代理中转台发送的所述公共电话网络的确认应答之后，所述中转台接收所述公共电话网络发送的语音信息，并建立所述终端和所述公共电话网络之间的语音数据传输；并接收所述集群系统中其他中转台发送的电话呼叫请求，所述电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起所述电话呼叫请求的终端的代理中转台；将所述电话呼叫请求转化为SIP请求，向所述公共电话网络发送所述SIP请求；接收所述公共电话网络发送的目标电话状态消息，并向发送所述电话呼叫请求的中转台转发，若所述目标电话状态消息为所述SIP请求的成功响应消息，则完成会话创建；向所述公共电话网络发送所述电话呼叫请求的中转台的地址，指定发送所述电话呼叫请求的中转台为所述会话中的语音承载。
一种中转台，包括至少一个处理器、至少一个移动通信射频组件、存储器和至少一个通信总线，所述存储器中存储程序代码，且处理器用于调用所述存储器中存储的程序代码，用于执行以下操作：
接收终端发起的电话呼叫请求；
在解析出所述电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为所述终端的代理中转台，若为否，则
查询所述终端的代理中转台，并向所述代理中转台发送所述电话呼叫请求；
在收到所述代理中转台发送的所述公共电话网络的确认应答之后，所述中转台接收所述公共电话网络发送的语音信息，并建立所述终端和所述公共电话网络之间的语音数据传输。
一种中转台，包括至少一个处理器、至少一个移动通信射频组件、存储器和至少一个通信总线，所述存储器中存储程序代码，且处理器用于调用所述存储器中存储的程序代码，用于执行以下操作：
中转台接收所述集群系统中其他中转台发送的电话呼叫请求，所述电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起所述电话呼叫请求的终端的代理中转台；
将所述电话呼叫请求转化为SIP请求，向所述公共电话网络发送所述SIP请求；
接收所述公共电话网络发送的目标电话状态消息，并向发送所述电话呼叫请求的中转台转发，若所述目标电话状态消息为所述SIP请求的成功响应消息，则完成会话创建；
向所述公共电话网络发送所述电话呼叫请求的中转台的地址，指定发送所述电话呼叫请求的中转台为所述会话中的语音承载。
由上述技术方案可知，集群系统的中转台接收终端发起的电话呼叫请求，在解析出电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为终端的代理终端台，若为否，则查询终端的代理中转台，并向代理中转台发送电话呼叫请求，在收到代理中转台发送的公共电话网络的确认应用后，中转台接收公共电话网络发送的语音数据，并建立终端和公共电话网络之间的语音数据传输，进而使得终端能够在任一中转台下通过此中转台进行电话网络的互联，实现终端的全网漫游，并且不存在额外的硬件设置添置或者信道资源的占用，因此，也不会造成高昂的代价。
附图说明
图1是一个实施例中一种数据通信的方法的流程图；
图2是另一个实施例中一种数据通信的方法的流程图；
图3是另一个实施例中一种数据通信的方法的流程图；
图4是另一个实施例中由集群系统的中转台执行的一种数据通信的方法的流程图；
图5是一个实施例中集群系统和电话网络之间的互联拓扑图；
图6是一个实施例中以终端为主叫侧的集群系统互联电话网络的网络拓扑示意图；
图7是图6中终端漫游到Repeater1下发起电话呼叫请求的时序图；
图8是以终端为被叫侧的集群系统互联电话网络的网络拓扑示意图；
图9是图8中代理中转台繁忙时电话呼叫其所代理注册的终端的时序图；
图10是一个实施例中一种数据通信的装置的的结构示意图；
图11是另一个实施例中一种数据通信的装置的的结构示意图；
图12是另一个实施例中一种数据通信的装置的的结构示意图；
图13是本发明实施例中终端的结构示意图。
具体实施方式
体现本发明特征与优点的典型实施方式将在以下的说明中详细叙述。应理解的是本发明能够在不同的实施方式上具有各种的变化，其皆不脱离本发明的范围，且其中的说明及图示在本质上是当作说明之用，而非用以限制本发明。
如前所述的，现有的集群系统中虽设置了多台中转台，但是对于一终端而言，其只能经由绑定的中转台与电话网络互联，进而实现电话功能。
然而，终端并不是固定不动的，常常由一中转台下活动至另一中转台下，因此，在实际的使用中，终端并不可能仅仅在绑定的中转台下活动。如何实现终端的全网漫游将成为集群系统中终端电话功能亟待解决的重要问题。
因此，本发明提供了一种数据通信的方法，如图1所示，在一个实施例中，该方法由集群系统的中转台执行，包括如下步骤：
步骤110，中转台接收终端发起的电话呼叫请求。
在此实施例中，终端可能是处于漫游状态，也就是说，终端可能并未在其绑定的中转台，即代理中转台下活动，而是在集群系统中的其它任一转台下活动。
若处于漫游状态的终端作为主叫侧发起电话呼叫请求，将向其所在的中转台发起电话呼叫请求。
在此，需要说明的是，在集群系统中，通过终端的注册，每一终端均与一中转台，即代理中转台存在着对应关系。换而言之，对于任一中转台，都指定了一个或者多个终端用户组，该终端用户组包括了多个终端，这些终端均与该中转台存在着对应关系，而该中转台便是这些终端的代理中转台。
终端优先在其代理中转台下活动并发起电话呼叫，以保证最快接入系统，减小等待时间，如若终端漫游至另一中转台，在另一中转台下活动，则只能够向此中转台发起电话呼叫请求，进而由此中转台将电话呼叫请求转发至终端的代理中转台。
接收到电话呼叫请求的中转台为集群系统的任一中转台，其中，该中转台可能是终端的代理中转台，也可能是集群系统中的其它中转台。
也就是说，任一中转台都可用于实现终端的接入，只须终端在其下活动即可，而并不仅限于终端的代理中转台。
步骤130，在解析出电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为终端的代理中转台，若为否，则执行步骤150，若为是，则执行步骤190。
每一中转台均预先指定了一个或者多个终端用户组，而集群系统中的任一终端都归属于某一中转台所指定的终端用户组的，而这一中转台将是终端的代理中转台。
基于此，中转台在接收到一终端发起的电话呼叫请求之后，如果此电话呼叫请求是发往公共电话网络的呼叫请求，判断本中转台是否为终端的代理中转台，若为是，则直接进入步骤190即可。
若判断得到本中转台并是发起电话呼叫请求的终端的代理中转台，则需要查询终端的代理中转台，在代理中转台的作用下实现终端和公共电话网络之间语音数据传输的建立。
步骤150，查询终端的代理中转台，并向代理中转台发送电话呼叫请求。
接收到电话呼叫请求的中转台在集群系统中广播，即广播发送查询消息，并且如若一接收到查询消息的中转台是该终端的代理终端台，则这一中转台将对查询消息进行应答，以使得接收到电话呼叫请求的中转台获知，并将电话呼叫请求转发至代理中转台，由代理中转台进行会话控制。
步骤170，在收到代理中转台发送的公共电话网络的确认应答之后，中转台接收公共电话网络发送的语音数据，并建立终端和公共电话网络之间的语音数据传输。
代理中转台在接收电话呼叫请求之后，根据电话呼叫请求创建会话并指定中转台为会话中的语音承载，以此来使得中转台能够接收公共电话网络发送的请求数据，并建立终端和公共电话网络之间的语音数据传输。
代理中转台用于为其所对应的终端进行会话控制。具体的，其在接收到其它中转台转发的电话呼叫请求之后，将为终端进行会话的创建。
代理中转台根据电话呼叫请求所进行的会话创建将是代理中转台与电话网络之间发起请求和响应的过程，在此过程中代理中转台所得到的电话网络响应也均向中转台转发，以便于经由中转台将其传送至终端，使得终端得以获知发起的电话呼叫中当前目标电话终端所对应的状态，例如，告之终端当前目标电话终端已经振铃，或者告之终端当前目标电话终端中被叫用户已经接起电话。
在完成此会话创建之后，代理中转台将指定终端所在的中转台为此创建的会话中的语音承载。也就是说，在此终端与电话网络中目标电话终端通话的过程中，指定终端所在的中转台承载通话中实时产生的语音数据，以实现终端和电话网络之间语音数据的传递。
对于终端而言，代理中转台创建了会话，则可通过所在的中转台与电话网络建立通话连接。
代理中转台完成了会话的创建之后，终端和电话网络中的目标电话终端接通，此后终端所输出的语音数据经由中转台传送至电话网络，而目标电话终端输出的语音数据也由电话网络通过中转台传送至终端，从而在终端和目标电话终端之间实现语音的实时传输。
步骤190，在代理中转台根据电话呼叫请求建立终端和公共电话网络之间的语音数据传输。
通过如上所述的过程，终端漫游至其下活动的中转台实现了电话功能中语音数据的实时传送，由此保障了漫游的终端的电话功能，从而使得集群系统中的终端漫游至任一中转台，并且终端所发送和接收的语音数据均是由所在的中转台承载的，而不再仅限于代理中转台和终端之间的语音数据传输，不需要通过空口信道由代理中转台获得，优化了空口信道资源的利用，减少了占用的空口信道资源，且降低成本，避免了终端的漫游限制。
在一个实施例中，步骤150中，查询终端的代理中转台，包括：
广播发送查询消息，用于查询终端的代理中转台；接收其它中转台对广播查询消息的应答，根据广播查询消息的应答确定终端的代理中转台；或
读取自身配置的代理中转台设置信息，获取终端的代理中转台；或
向管理代理中转台信息的网络实体查询，获取终端的代理中转台。
其中，对于代理中转台的确定，接收到电话呼叫请求的中转台在集群系统中进行广播，以向其它中转台询问其是否为终端的代理中转台，以便于请求终端的代理中转台为终端处理电话呼叫请求。
相对接收到电话呼叫请求并进行查询消息广播的中转台，集群系统中的其它中转台中存在着终端的代理中转台，该代理中转台在接收到查询消息之后，将对此进行应答。
当然，也可通过中转台中自身配置的代理中转台设置信息或者管理代理中转台信息的网络实体查询。
通过此过程，对于活动在中转台下的任意终端，都能够实现此终端与电话网络的互联，而不再仅限于代理中转台下的终端，在节省了中转台的空口信道资源的同时，也增强了中转台的通信性能，并且提高了集群系统中资源分配的灵活性。
在一个实施例中，该方法还包括：接收到代理中转台发送的会话终止请求命令时，终止语音数据传输。
无论终端处于漫游状态，还是代理中转台处于繁忙状态，语音数据传输控制都将是由代理中转台实现的，而语音数据的实际传输则是由其它中转台实现的。
因此，在集群系统中对于会话的释放而言，其也是由代理中转台实现的。
通话中主叫侧和被叫侧的任意一侧挂机都将触发会话终止请求命令。例如，该会话终止请求命令为BYE请求命令。
电话网络或者终端将会话终止请求命令传送至代理中转台，以触发代理中转台释放所进行的语音数据传输，终止语音数据的传输，结束此次通话。
在一个实施例中，如图2所示，该方法还包括：
步骤210，中转台接收公共电话网络向终端发起的电话呼叫请求。
步骤230，中转台在处于繁忙状态时将电话呼叫请求转发至集群系统中的空闲中转台。
步骤250，中转台接收空闲中转台发送的响应消息，响应消息为空闲中转台向终端发起呼叫后，接收到终端发送的响应消息后发送的。
步骤270，中转台将响应消息转换为SIP请求，向电话网络发送SIP请求。
步骤290，中转台将空闲中转台地址发送给公共电话网络，指定空闲中转台承载语音。
集群系统与电话网络互联，由此实现其与电话网络中任一电话终端的通信。其中，集群系统包括了集合在一起的多个中转台，每一中转台均有指定的终端用户组，该终端用户组包括了多个终端，任一终端可以是在其所属的中转台，即代理中转台下活动并与电话网络中任一电话终端通话，也可以在其它中转台下活动，即在漫游状态下通过其它中转台与电话网络中任一电话终端通话。
由此，集群系统中终端将可在任意中转台下接入通信，减小了终端接入所需要的等待时间，并且在保证业务质量的前提下最大限度地扩充了系统的通信容量，集群系统中任一终端能够尽可能快速高效进行电话。
集群系统中通过如上所述的过程，使得无论代理中转台处于繁忙状态还是空闲状态，均可实现终端的系统接入和尽可能快速高效地进行语音通信。
在一个实施例中，如图3所示，该方法还包括：
步骤310，中转台在接收到集群系统中其他中转台发送的电话呼叫请求，且处于空闲状态时，向其他中转台发送的电话呼叫请求呼叫的终端发送通知消息。
电话终端为主叫侧，而终端为被叫侧。电话终端向一终端发起电话呼叫请求时，该终端在集群系统中的代理中转台将接收到此电话呼叫请求，并向本中转台发送电话呼叫请求。也就是说，所指的其他中转台，为终端的代理中转台。
代理中转台接收到电话呼叫请求之后，首先判断自身是否处于繁忙状态，若为是，则说明代理中转台的时隙均被其它业务占用，进而无法实现电话功能，因此，繁忙状态的代理中转台将电话呼叫请求转发至集群系统的一空闲中转台。
本中转台根据接收的电话呼叫请求发送通知消息，例如，通知消息可以是振铃消息，使被叫终端进行振铃，以通知用户摘机接听电话。
步骤330，在收到其他中转台发送的电话呼叫请求呼叫的终端反馈的应答后，再向电话网络发送SIP请求。
本中转台接收到代理中转台转发的电话呼叫请求之后，将此电话呼叫请求转化为振铃消息，并向终端发起呼叫。接收到振铃消息的终端进行振铃，以通知并等待终端的用户接起。
在终端的用户摘机接通发起的电话时，通过终端中触发的操作而向所在的中转台应答，即向本中转台返回响应消息，该响应由本中转台转发至代理中转台，进而在代理中转台的作用下最终转化为SIP请求。
需要说明的是，终端通过触发的拨号来实现应答，该应答包含了终端输入的接入码。
本中转台验证终端的应答，以判断应答的接入码是否正确，如若正确，则发向代理中转台发送响应消息。
步骤350，建立公共电话网络和终端之间语音数据传输。
随着终端对电话呼叫的响应，在代理中转台的作用下，建立电话网络和空闲的中转台之间的通话连接，以指定空闲的中转台承载实现电话功能的语音，终端和电话网络之间的语音数据由此空闲的中转台分别进行转发。
通过如上所述的过程，使得终端的电话功能并不会由于代理中转台信道资源的有限而受到限制，避免了其电话功能在代理中转台繁忙时无法使用，提高了终端电话功能的可靠 性和稳定性。
例如，现有的中转台只有两个时隙，同一时间最多只能支持两路电话，而且一旦时隙被其业务占用，电话功用将无法使用，并无法实现集群系统中的信道共享，造成了信道资源的浪费，而通过如上所述的过程，使用限制少且方便。
在终端作为被叫侧所实现的电话功能中，终端通过与集群系统中一空闲的中转台之间的通信实现与电话终端之间的通话，从而避免终端在代理中转台繁忙时电话功能的受限，保证了终端中电话功能的稳定性。
通过如上所述的过程，集群系统中，终端可在漫游到任意中转台下，并且在任意中转台下都可实现其拨打或者接听电话的功能，极大地提高了终端中电话功能的可靠性。
在一个实施例中，一种数据通信的方法，该方法由集群系统的中转台执行，如图4所示，包括如下步骤：
步骤410，中转台接收集群系统中其他中转台发送的电话呼叫请求，电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起电话呼叫请求的终端的代理中转台。
步骤430，将电话呼叫请求转化为SIP请求，向公共电话网络发送SIP请求。
相对向一中转台发起电话呼叫请求的终端，其代理中转台将接收到此中转台转发的电话呼叫请求，将电话呼叫请求转化为SIP请求之后发送至电话网络中，以使电话网络中的目标电话终端为终端发起的电话呼叫进行响应。
其中，SIP请求中包含了电话呼叫的源终端和目的终端，其用于指定呼叫方向。例如，SIP请求中包括From:5001/To:110，则说明电话呼叫的源终端是号码为5001的终端，而目的终端为电话号码110的电话终端。
步骤450，接收公共电话网络发送的目标电话状态消息，并向发送电话呼叫请求的中转台转发，若目标电话状态消息为SIP请求的成功响应消息，则完成会话创建。
电话网络发送的目标电话状态消息用于指示目标电话终端在接收到SIP请求之后的状态，因此，目标电话状态消息包括了振铃状态消息和成功响应消息，其中，振铃状态消息用于反馈目标电话终端已经振铃，以实现主叫侧电话呼叫的通知，正在等待被叫侧接起电话；成功响应消息是被叫侧接起电话时发出的。例如，该振铃状态消息可为180Ringing，成功响应消息可为200OK。
具体的，电话网络接收到代理中转台发送的SIP请求之后，将根据此SIP请求向目标电话终端发送振铃消息，以使作为被叫侧的目标电话终端振铃，并等待用户接起电话。
在目标电话终端振铃的过程中，电话网络将向代理中转台反馈振铃状态消息，从而通过代理中转台向终端所在的中转台转发振铃状态消息，告之终端的用户其所发起的电话呼叫已被传送到被叫侧并通知被叫侧振铃。
另一方面的，在被叫侧等待用户接起电话的过程中，如若目标电话终端的用户接起电话，则目标电话终端通过电话网络发送成功响应消息，以进行被叫侧为终端电话呼叫的最终响应。
此在代理中转台的作用下，进行了终端和目标电话终端之间的会话创建，而成功响应消息则是被叫侧针对电话呼叫请求所进行的最终响应。代理中转台中成功响应消息的接收则说明了终端和目标电话终端之间会话创建的完成。
步骤470，向公共电话网络发送电话呼叫请求的中转台的地址，指定发送电话呼叫请求的中转台为所述会话中的语音承载。
代理中转台指定终端所在的中转台为会话中的语音承载，进而代理中转台不再承载会话中终端和目标电话终端之间的语音，在优化集群系统中信道资源利用的同时，也实现了会话控制和语音传输的分离，即SIP会话和RTP语音流的分离，并部署在不同中转台上，实现了集群系统的均衡网络负载。
下面结合一个具体的实施例来详细阐述如上所述的方法。该实施例中，集群系统和电话网络之间的互联拓扑如图5所示，其中，集群系统510和电话网络530之间分别通过SIP协议进行会话控制，通过RTP协议进行实时语音的传输。
需要说明的是，电话网络530包括了IPPBX(基于网络地址的电话系统)531和若干个电话终端533。
集群系统510中，基站511覆盖的范围被划分成了多个区域，同一区域可设置多个中转台513，多个中转台513集合在一起组成一个站点，以便允许终端515使用站点中的所有中转台513进行通信，而避免专有的控制信道的设置，提升信道的利用率，并最大限度地扩展通信容量。
集群系统510中的任一终端515，其所使用的分机号码是通过一指定的中转台513在电话网络530中进行注册的，由此，用以实现终端515注册的中转台513为这一终端515的代理中转台。
注册的分机号码是与IP地址绑定的，终端515拨打或者接听电话业务都只能在代理注册的中转台513下发起，并由代理注册的中转台513维持。
如前所述的，中转台513在收到不是自己代理注册的终端515发起的电话呼叫时，会将电话呼叫请求发送至代理中转台，由代理中转台发起会话，同时指定语音承载为终端515发起电话呼叫的中转台513。
如此，终端515可以在任意中转台513任意信道下拨打电话，实现终端电话业务全网漫游功能。同理，电话终端531拨打终端515时，如果代理中转台处于繁忙状态，则代理中转台会将电话呼叫请求传递给集群系统510内的空闲中转台，由空闲中转台承载语音，实现系统内的电话信道共享。
一方面的，以终端为主叫侧进行时序流程的说明。
图6示出了以终端为主叫侧的集群系统互联电话网络的网络拓扑示意图。其中，设置的中转台包括Repeater1、Repeater2和Repeater3，其分别配置于与IPPBX互联的Switcher之下，为各终端提供接入服务。
分机号码为5000的终端620的代理中转台为Repeater3，但其在Repeater1下活动。因此，终端620在其发起电话呼叫，即执行步骤1a时，Repeater1会收到电话呼叫请求并发现终端620并不是自己代理注册的，将电话呼叫请求发送给代理中转台Repeater3，Repeater3和电话IPPBX之间协商建立会话，并指定Repeater1为语音的承载。IPPBX将电话终端的语音发送到Repeater1，Repeater1在空口上转发给分机号码为5000的终端。
上述执行的详细时序过程可参考如图7所示，图7展示了终端漫游到Repeater1下发起电话呼叫请求的整个时序过程。
另一方面的，以终端为被叫侧进行时序流程的说明。
图8示出了以终端为被叫侧的集群系统互联电话网络的网络拓扑示意图。电话终端呼叫终端620时，由于Repeater3处于繁忙状态，则将此电话业务通知到Repeater1，由Repeater1承载语音，并在空口与终端620交互。
所执行的详细时序过程可参考如图9所示，图9展示了代理中转台，即Repeater3繁忙时电话呼叫其所代理注册的终端的整个时序过程。
通过如上所述的过程，实现了集群系统和电话网络的互通，由于不需要配备额外的硬件设备，因此不会增加硬件成本。
如上所述的终端与电话网络互联的过程是基于SIP协议所实现的，由于SIP协议已经广泛应用于各种语音和视频通信领域，硬件设备成熟可靠、选择性多，便得电话网络搭建时部署简单、通用性强。不同的中转台可连接到同一个电话系统或者分别连接不同的电话系统，节省了硬件成本，增加了系统容量，与现有的第三方设备连接方案所不的是，其不仅可实现模拟电话的互通，也能够实现与数字电话的互通，后续扩展性强。
如上所述的终端与电话网络互联的过程，在不增加任何其他辅助功能设备或协议的情况下，实现了信道共享、全网漫游，造价低、体验好。资源配置实现最大化，限制少使用方便。
在此电话业务场景下，会话控制和语音流自动分离，部署在不同中转台上，均衡网络负载。
在一个实施例中，一种数据通信的装置，如图10所示，该装置内置于集群系统的任一中转台，该装置包括：第一接收单元910、判断单元930、查找单元950和第一传输建立单元970。
第一接收单元910，用于接收终端发起的电话呼叫请求。
判断单元930，用于在解析出电话呼叫请求为发往公共电话网络的呼叫请求时，判 断本中转台是否为终端的代理中转台，若为否，则在代理中转台根据电话呼叫请求建立终端和公共电话网络之间的语音数据传输
查找单元950，用于查询终端的代理中转台，并向代理中转台发送电话呼叫请求。
第一传输建立单元970，用于在收到代理中转台发送的公共电话网络的确认应答之后，接收公共电话网络发送的语音信息，并建立终端和公共电话网络之间的语音数据传输。
在一个实施例中，查找单元950，包括：第一查找单元或第二查找单元或第三查找单元。
第一查找单元，用于广播发送查询消息，查询终端的代理中转台；接收其它中转台对广播查询消息的应答，根据广播查询消息的应答确定终端的代理中转台；或
第二查找单元，用于读取自身配置的代理中转台设置信息，获取终端的代理中转台；或
第三查找单元，用于向管理代理中转台信息的网络实体查询，获取终端的代理中转台。
在一个实施例中，一种数据通信的装置，如图11所示，包括：第一繁忙处理单元1010和第二繁忙处理单元1030。
第一繁忙处理单元1010，用于接收公共电话网络向终端发起的电话呼叫请求；中转台在处于繁忙状态时将电话呼叫请求转发至集群系统中的空闲中转台；中转台接收空闲中转台发送的响应消息，响应消息为空闲中转台向终端发起呼叫后，接收到终端发送的响应消息后发送的；中转台将响应消息转换为SIP请求，向电话网络发送SIP请求；中转台将空闲中转台地址发送给公共电话网络，指定空闲中转台承载语音；
第二繁忙处理单元1030，用于在接收到集群系统中其他中转台发送的电话呼叫请求，且处于空闲状态时，向其他中转台发送的电话呼叫请求呼叫的终端发送通知消息；在收到其他中转台发送的电话呼叫请求呼叫的终端反馈的应答后，再向电话网络发送SIP请求；建立公共电话网络和终端之间语音数据传输。
在一个实施例中，一种数据通信的装置，装置内置于集群系统的任一中转台，如图12所示，该装置包括：第二接收单元1110、转化单元1130和第二传输建立单元1150。
第二接收单元1110，用于接收集群系统中其他中转台发送的电话呼叫请求，电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起电话呼叫请求的终端的代理中转台。
转化单元1130，用于将电话呼叫请求转化为SIP请求，向公共电话网络发送SIP请求。
第二传输建立单元1150，用于接收公共电话网络发送的目标电话状态消息，并向发送电话呼叫请求的中转台转发，若目标电话状态消息为SIP请求的成功响应消息，则完成会话创建；向公共电话网络发送电话呼叫请求的中转台的地址，指定发送电话呼叫请求的中转台为会话中的语音承载。
在一个实施例中，一种集群系统，包括连接在一起的多台中转台和活动在任一中转台下的终端，代理终端在公共电话网络进行注册的中转台，为终端的代理中转台，其中：
终端用于发起电话呼叫请求；
中转台用于接收终端发起的电话呼叫请求；在解析出电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为终端的代理中转台，若为否，则查询终端的代理中转台，并向代理中转台发送电话呼叫请求；在收到代理中转台发送的公共电话网络的确认应答之后，中转台接收公共电话网络发送的语音信息，并建立终端和公共电话网络之间的语音数据传输；并接收集群系统中其他中转台发送的电话呼叫请求，电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起电话呼叫请求的终端的代理中转台；将电话呼叫请求转化为SIP请求，向公共电话网络发送SIP请求；接收公共电话网络发送的目标电话状态消息，并向发送电话呼叫请求的中转台转发，若目标电话状态消息为SIP请求的成功响应消息，则完成会话创建；向公共电话网络发送电话呼叫请求的中转台的地址，指定发送电话呼叫请求的中转台为会话中的语音承载。
图13是本发明实施例中的一种终端的结构示意图，终端1800可以包括：至少一个处 理器1801，例如CPU，基带控制器等，至少一个移动通信射频组件1803，存储器1804，至少一个通信总线1802。其中，通信总线1802用于实现这些组件之间的连接通信。存储器1804可以是高速RAM存储器，也可以是非易失的存储器(non-volatile memory)，例如至少一个磁盘存储器。存储器1804可选的还可以是至少一个位于远离前述处理器1801的存储装置。存储器1804中存储一组程序代码，且处理器1801用于调用存储器中存储的程序代码，用于执行以下操作：
接收终端发起的电话呼叫请求；
在解析出所述电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为所述终端的代理中转台，若为否，则
查询所述终端的代理中转台，并向所述代理中转台发送所述电话呼叫请求；
在收到所述代理中转台发送的所述公共电话网络的确认应答之后，所述中转台接收所述公共电话网络发送的语音信息，并建立所述终端和所述公共电话网络之间的语音数据传输。
在另一个实施例中，一种中转台，包括至少一个处理器、至少一个移动通信射频组件、存储器和至少一个通信总线，所述存储器中存储程序代码，且处理器用于调用所述存储器中存储的程序代码，用于执行以下操作：
中转台接收所述集群系统中其他中转台发送的电话呼叫请求，所述电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起所述电话呼叫请求的终端的代理中转台；
将所述电话呼叫请求转化为SIP请求，向所述公共电话网络发送所述SIP请求；
接收所述公共电话网络发送的目标电话状态消息，并向发送所述电话呼叫请求的中转台转发，若所述目标电话状态消息为所述SIP请求的成功响应消息，则完成会话创建；
向所述公共电话网络发送所述电话呼叫请求的中转台的地址，指定发送所述电话呼叫请求的中转台为所述会话中的语音承载。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
虽然已参照几个典型实施方式描述了本发明，但应当理解，所用的术语是说明和示例性、而非限制性的术语。由于本发明能够以多种形式具体实施而不脱离发明的精神或实质，所以应当理解，上述实施方式不限于任何前述的细节，而应在随附权利要求所限定的精神和范围内广泛地解释，因此落入权利要求或其等效范围内的全部变化和改型都应为随附权利要求所涵盖。

Claims (13)

  1. 一种数据通信的方法，其特征在于，所述方法由集群系统的中转台执行，包括如下步骤：
    中转台接收终端发起的电话呼叫请求；
    在解析出所述电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为所述终端的代理中转台，若为否，则
    查询所述终端的代理中转台，并向所述代理中转台发送所述电话呼叫请求；
    在收到所述代理中转台发送的所述公共电话网络的确认应答之后，所述中转台接收所述公共电话网络发送的语音数据，并建立所述终端和所述公共电话网络之间的语音数据传输。
  2. 根据权利要求1所述的方法，其特征在于，所述查询所述终端的代理中转台包括：
    广播发送查询消息，用于查询所述终端的代理中转台；接收其它中转台对所述广播查询消息的应答，根据所述广播查询消息的应答确定所述终端的代理中转台；或
    读取自身配置的代理中转台设置信息，获取所述终端的代理中转台；或
    向管理代理中转台信息的网络实体查询，获取所述终端的代理中转台。
  3. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    接收到所述代理中转台发送的会话终止请求命令时，终止所述语音数据传输。
  4. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    所述中转台接收所述公共电话网络向终端发起的电话呼叫请求；
    所述中转台在处于繁忙状态时将所述电话呼叫请求转发至所述集群系统中的空闲中转台；
    所述中转台接收所述空闲中转台发送的响应消息，所述响应消息为所述空闲中转台向所述终端发起呼叫后，接收到所述终端发送的响应消息后发送的；
    所述中转台将所述响应消息转换为SIP请求，向所述电话网络发送所述SIP请求；
    所述中转台将所述空闲中转台地址发送给公共电话网络，指定所述空闲中转台承载语音。
  5. 根据权利要求3所述的方法，其特征在于，所述方法还包括：
    所述中转台在接收到所述集群系统中其他中转台发送的电话呼叫请求，且处于空闲状态时，向所述其他中转台发送的电话呼叫请求呼叫的终端发送通知消息；
    在收到所述其他中转台发送的电话呼叫请求呼叫的终端反馈的应答后，再向所述电话网络发送所述SIP请求；
    建立所述公共电话网络和终端之间语音数据传输。
  6. 一种数据通信的方法，其特征在于，所述方法由集群系统的中转台执行，包括如下步骤：
    中转台接收所述集群系统中其他中转台发送的电话呼叫请求，所述电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起所述电话呼叫请求的终端的代理中转台；
    将所述电话呼叫请求转化为SIP请求，向所述公共电话网络发送所述SIP请求；
    接收所述公共电话网络发送的目标电话状态消息，并向发送所述电话呼叫请求的中转台转发，若所述目标电话状态消息为所述SIP请求的成功响应消息，则完成会话创建；
    向所述公共电话网络发送所述电话呼叫请求的中转台的地址，指定发送所述电话呼叫请求的中转台为所述会话中的语音承载。
  7. 一种数据通信的装置，其特征在于，所述装置内置于集群系统的任一中转台，所述装置包括：
    第一接收单元，用于接收终端发起的电话呼叫请求；
    判断单元，用于在解析出所述电话呼叫请求为发往公共电话网络的呼叫请求时，判 断本中转台是否为所述终端的代理中转台，若为否，则
    查找单元，用于查询所述终端的代理中转台，并向所述代理中转台发送所述电话呼叫请求；
    第一传输建立单元，用于在收到所述代理中转台发送的所述公共电话网络的确认应答之后，接收所述公共电话网络发送的语音信息，并建立所述终端和所述公共电话网络之间的语音数据传输。
  8. 根据权利要求7所述的装置，其特征在于，所述查找单元包括：
    第一查找单元，用于广播发送查询消息，查询所述终端的代理中转台；接收其它中转台对所述广播查询消息的应答，根据所述广播查询消息的应答确定所述终端的代理中转台；或
    第二查找单元，用于读取自身配置的代理中转台设置信息，获取所述终端的代理中转台；或
    第三查找单元，用于向管理代理中转台信息的网络实体查询，获取所述终端的代理中转台。
  9. 根据权利要求7或8所述的装置，其特征在于，所述装置还包括：
    第一繁忙处理单元，用于接收所述公共电话网络向终端发起的电话呼叫请求；所述中转台在处于繁忙状态时将所述电话呼叫请求转发至所述集群系统中的空闲中转台；所述中转台接收所述空闲中转台发送的响应消息，所述响应消息为所述空闲中转台向所述终端发起呼叫后，接收到所述终端发送的响应消息后发送的；所述中转台将所述响应消息转换为SIP请求，向所述电话网络发送所述SIP请求；所述中转台将所述空闲中转台地址发送给公共电话网络，指定所述空闲中转台承载语音；
    第二繁忙处理单元，用于在接收到所述集群系统中其他中转台发送的电话呼叫请求，且处于空闲状态时，向所述其他中转台发送的电话呼叫请求呼叫的终端发送通知消息；在收到所述其他中转台发送的电话呼叫请求呼叫的终端反馈的应答后，再向所述电话网络发送所述SIP请求；建立所述公共电话网络和终端之间语音数据传输。
  10. 一种数据通信的装置，其特征在于，所述装置内置于集群系统的任一中转台，所述装置包括：
    第二接收单元，用于接收所述集群系统中其他中转台发送的电话呼叫请求，所述电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起所述电话呼叫请求的终端的代理中转台；
    转化单元，用于将所述电话呼叫请求转化为SIP请求，向所述公共电话网络发送所述SIP请求；
    第二传输建立单元，用于接收所述公共电话网络发送的目标电话状态消息，并向发送所述电话呼叫请求的中转台转发，若所述目标电话状态消息为所述SIP请求的成功响应消息，则完成会话创建；向所述公共电话网络发送所述电话呼叫请求的中转台的地址，指定发送所述电话呼叫请求的中转台为所述会话中的语音承载。
  11. 一种集群系统，其特征在于，包括连接在一起的多台中转台和活动在所述任一中转台下的终端，代理终端在公共电话网络进行注册的中转台，为所述终端的代理中转台，其中：
    所述终端，用于发起电话呼叫请求；
    所述中转台，用于接收终端发起的电话呼叫请求；在解析出所述电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为所述终端的代理中转台，若为否，则查询所述终端的代理中转台，并向所述代理中转台发送所述电话呼叫请求；在收到所述代理中转台发送的所述公共电话网络的确认应答之后，所述中转台接收所述公共电话网络发送的语音信息，并建立所述终端和所述公共电话网络之间的语音数据传输；并接收所述集群系统中其他中转台发送的电话呼叫请求，所述电话呼叫请求为发往公共电话网络的呼叫 请求，本中转台为发起所述电话呼叫请求的终端的代理中转台；将所述电话呼叫请求转化为SIP请求，向所述公共电话网络发送所述SIP请求；接收所述公共电话网络发送的目标电话状态消息，并向发送所述电话呼叫请求的中转台转发，若所述目标电话状态消息为所述SIP请求的成功响应消息，则完成会话创建；向所述公共电话网络发送所述电话呼叫请求的中转台的地址，指定发送所述电话呼叫请求的中转台为所述会话中的语音承载。
  12. 一种中转台，其特征在于，包括至少一个处理器、至少一个移动通信射频组件、存储器和至少一个通信总线，所述存储器中存储程序代码，且处理器用于调用所述存储器中存储的程序代码，用于执行以下操作：
    接收终端发起的电话呼叫请求；
    在解析出所述电话呼叫请求为发往公共电话网络的呼叫请求时，判断本中转台是否为所述终端的代理中转台，若为否，则
    查询所述终端的代理中转台，并向所述代理中转台发送所述电话呼叫请求；
    在收到所述代理中转台发送的所述公共电话网络的确认应答之后，所述中转台接收所述公共电话网络发送的语音信息，并建立所述终端和所述公共电话网络之间的语音数据传输。
  13. 一种中转台，其特征在于，包括至少一个处理器、至少一个移动通信射频组件、存储器和至少一个通信总线，所述存储器中存储程序代码，且处理器用于调用所述存储器中存储的程序代码，用于执行以下操作：
    中转台接收所述集群系统中其他中转台发送的电话呼叫请求，所述电话呼叫请求为发往公共电话网络的呼叫请求，本中转台为发起所述电话呼叫请求的终端的代理中转台；
    将所述电话呼叫请求转化为SIP请求，向所述公共电话网络发送所述SIP请求；
    接收所述公共电话网络发送的目标电话状态消息，并向发送所述电话呼叫请求的中转台转发，若所述目标电话状态消息为所述SIP请求的成功响应消息，则完成会话创建；
    向所述公共电话网络发送所述电话呼叫请求的中转台的地址，指定发送所述电话呼叫请求的中转台为所述会话中的语音承载。
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