CN105472187B - A kind of voice communication control system based on TDM and IP dual bus - Google Patents

A kind of voice communication control system based on TDM and IP dual bus Download PDF

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Publication number
CN105472187B
CN105472187B CN201510785870.9A CN201510785870A CN105472187B CN 105472187 B CN105472187 B CN 105472187B CN 201510785870 A CN201510785870 A CN 201510785870A CN 105472187 B CN105472187 B CN 105472187B
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interface
tdm
module
bus
switching
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CN105472187A (en
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孙英晖
鞠瑞林
王虎
纪凌
杨康
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Nanjing Lesi Electronic Equipment Co., Ltd.
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Nanjing Lesi Electronic Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H04M7/0081—Network operation, administration, maintenance, or provisioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H04M3/568—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/0024—Services and arrangements where telephone services are combined with data services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H04M7/126—Interworking of session control protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2215/00—Metering arrangements; Time controlling arrangements; Time indicating arrangements
    • H04M2215/74—Rating aspects, e.g. rating parameters or tariff determination apects
    • H04M2215/7478—According to the number of recipients
    • H04M2215/7485—Group call; Conference call; Multi Party Call

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • General Engineering & Computer Science (AREA)
  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

It include IP phone, voice communication panel, network management terminal, external IP network, MPU unit, magnetite interface, EM interface, FXO interface and FXS interface the invention discloses a kind of voice communication control system based on TDM and IP dual bus；The IP phone, voice communication panel, network management terminal and external IP network are the side IP, pass through IP bus link MPU unit；Magnetite interface, EM interface, FXO interface and FXS interface are the side TDM, pass through TDM bus link MPU unit；The voice communication panel is communication terminal；The network management terminal realizes system monitoring management, the interconnection of external IP network implementations system external；Magnetite interface, EM interface, FXO interface and FXS interface are the analogue user interface based on TDM bus.

Description

A kind of voice communication control system based on TDM and IP dual bus
Technical field
The invention belongs to voice communication technology field more particularly to TDM buses, IP signaling bus information and media information The voice communication control system based on TDM and IP dual bus of interaction, conversion.
Background technique
Voice communication control system is the weight of the large automatics command and control systems such as army's civil aviation control, military commander control Want component part, currently there are the Related product of two kinds of technical systems, first is that it is traditional it is simple using TDM as bus, adopt The voice communication control system of core is exchanged for circuit；Second is that based on commercial server framework, the language that IP-based switching is core Sound communication control system.The product of two kinds of technical systems has respective advantage and disadvantage, and wherein the former is because having speech quality height, place Reason strong real-time, the advantages that time delay is small, network exchange and meeting bridge ability are strong and be widely used, but there is also signal transmission distances From the disadvantages of limited, set expandability is poor, networking capability is weak；And the latter is due to doing platform and pure soft switch using commercial server The mode of realization, although its network capabilities is improved, there is also processing capacity especially exchange of media abilities, meeting bridge energy The abilities such as power and media handling implementation are unable to satisfy the number of ports, more of large capacity Combat Command System because being limited by its hardware platform The requirement of function (especially air-ground conferencing function), real-time etc..
Summary of the invention
The present invention is to meet the increasingly busy speech commander's business demand of large-scale Combat Command System commander and based on IP technology The application demand of air-ground Speech Communication networking discloses a kind of voice communication control system based on TDM and IP dual bus, realizes Voice connection, routing and function of exchange.
It include that IP phone, voice are logical the invention discloses a kind of voice communication control system based on TDM and IP dual bus Believe panel, network management terminal, external IP network, MPU unit, magnetite interface, EM interface, FXO interface and FXS interface；
The IP phone, voice communication panel, network management terminal and external IP network are the side IP, pass through IP bus link MPU unit；
Magnetite interface, EM interface, FXO interface and FXS interface are the side TDM, pass through TDM bus link MPU unit；
The voice communication panel is communication terminal；
The network management terminal realizes that system monitoring management, external IP network show system external interconnection；
Magnetite interface, EM interface, FXO interface and FXS interface are the analogue user interface based on TDM bus.
In the present invention, the MPU unit includes CPU module, IP Switching Module, serial ports processing module, DSP module, meeting Processing module, TDM-RTP conversion module and TDM Switching Module；
The CPU module be separately connected IP Switching Module, serial ports processing module, DSP module, meeting processing module and TDM Switching Module；The IP Switching Module is separately connected IP phone, voice communication panel, network management terminal and external IP network Network, and TDM Switching Module is connected by TDM-RTP conversion module；The serial ports processing module is separately connected by serial bus Magnetite interface, EM interface, FXO interface and FXS interface；The DSP module connects TDM Switching Module by TDM bus；It is described Meeting processing module connects TDM Switching Module by on-chip bus；The TDM Switching Module is separately connected magnetic by TDM bus Stone interface, EM interface, FXO interface and FXS interface；
IP Switching Module realizes the exchange control of voice packets；
Speech sound mixing function between meeting processing modules implement different user, supports the echo cancelltion in 512 channels, and echo is supported A length of 32ms when disappearing；
TDM-RTP conversion module realizes the media format conversion between RTP and TDM；
Media stream transition, distribution, fusion between TDM Switching Module realization different user, realize speech between different user Transmission.
Magnetite interface can externally send the detectability of ringing-current, external ringing-current incoming signal for accessing magnetic telephone And Tone Via.
EM interface can between other switching networks EM relay interconnection, complete in the EM between this system and external switching network After the foundation of link, voice signal access, signaling controls and transmission；EM interface can be mutual with the radio station with EM interface simultaneously Connection is realized and receives and dispatches control to the speech in radio station；
FXO interface can be interconnected with the FXS interface of other switching networks, for completing between this system and external switching network Foundation, voice signal access, signaling control and the transmission of analog junction link；
FXS interface for access simulation common-battery phone, realize simulation common-battery phone voice signal access, signaling control with Transmission.
The present invention the following steps are included:
CPU module initialization in MPU unit, receives the user's registration information from IP bus by IP Switching Module, Registration information including IP phone, voice communication panel and external IP network, realizes resource allocation, the status monitoring of IP user； CPU module receives the initialization letter from magnetite interface, EM interface, FXO interface and FXS interface by serial ports processing module Breath realizes resource allocation to above-mentioned analog interface, status monitoring；
When the side IP user issues call request, which is received by IP Switching Module and issues CPU module, CPU module Judge callee's type, if callee remains as the side IP user, called routing iinformation is searched by IP Switching Module, foundation is exhaled It cries；If callee is the side TDM user, CPU module sends signaling to callee by serial ports processing module, using serial bus Information connects called time slot by TDM-RTP conversion module and TDM Switching Module, realizes call；
When the side TDM user issues call request, CPU module obtains caller state parameter by serial ports processing module, leads to It crosses DSP module and carries out transmitting-receiving number processing, CPU module obtains the information of serial ports processing module and DSP module, judges callee's class Type, if callee remains as the side TDM user, CPU module, to called transmission signaling information, is passed through by serial ports processing module TDM Switching Module connects called time slot, realizes call；If callee is the side IP user, CPU module is looked by IP Switching Module Called routing iinformation is looked for, realizes call；
When each user needs to hold a meeting, the speech of the side IP user is uniformly converted into TDM format and is handled by meeting Module carries out audio mixing, and the sound after audio mixing is sent to analogue user interface by TDM bus by TDM Switching Module again, or passes through On-chip bus is recycled to IP Switching Module, is distributed to the side IP user by IP bus by IP Switching Module, realizes Multi-Party Conference Function.
Voice communication control system of the present invention is made of MPU and multiple interfaces module and terminal, and MPU is voice communication control The control of system and switching centre generate, system control for realizing larger volume switching network, meeting bridge, signaling processing, signal sound System connects and the functions such as network communication.IP bus and TDM bus are designed simultaneously in MPU, IP bus can be with external IP terminal (example Such as: IP phone, voice communication panel, network management terminal) interconnect, TDM bus can with external analog interface (such as: FXS connects Mouth, FXO interface, EM interface, magnetite interface etc.) interconnection, realize the access of variety classes user.IP is realized using large-scale F PGA Exchange, TDM exchange, TDM-RTP conversion and meeting processing function.
Compared with prior art, the present invention its significant advantage is:
A) circuit switching and soft switch Combined design framework.Design has IP bus and TDM simultaneously in voice communication system Bus enhances the access capability of system, while guaranteeing the high real-time during Tone Via and low distortion.
B) present invention realizes meeting bridge function using large capacity fpga chip, and switching network capacity reaches 8192 × 8192, seat Position maximum access quantity amount reaches 1024, is greatly improved the exchange capacity and access capability of system.
C) present invention uses modular mentality of designing, and software systems are divided into multiple business functions according to business function Module is communicated between each module by message, to ensure that the relatively independent of each submodule, also makes system software knot Structure is relatively sharp, is convenient for the subsequent Function Extension of product.
D) the call treatment mode based on conference model.Utilize the convergence processing ability of meeting processing module and concurrent processing Ability, traditional individual calling, group is exhaled, the multifarious call treatment such as meeting is all unified for meeting processing, simplifies processing stream Journey improves the stability and reliability of system.
E) core processor of the present invention uses X 86 processor, and processing capacity is strong, reliable and stable.
Detailed description of the invention
Fig. 1 is present system structural schematic diagram.
Specific embodiment
The invention discloses a kind of voice communication control systems based on TDM and IP dual bus.It includes IP phone, voice Communication panel, network management terminal, external IP network, MPU, magnetite interface, EM interface, FXO interface, FXS interface.It may be implemented The access of different user based on IP and based on TDM, with realizing the ground of internal system and cross-system, earth-space communication function.Collect IP Exchange and TDM exchange advantage are in the voice communication control system of one, and technical system is mature, and architecture is advanced, man-machine interface Close friend, hardware interface are abundant, and configuration management is flexible, communicate with capable of conveniently realizing various ground, earth-space communication, monitoring management etc. Function can be applied in the voice communication systems in command and control field such as all kinds of military, civil airports.
Embodiment
Voice communication control system of the invention includes IP phone 1, voice communication panel 2, network management terminal 3, outside IP network 4, MPU unit 5, magnetite interface 6, EM interface 7, FXO interface 8, FXS interface 9.
As shown in Figure 1, present embodiment discloses a kind of voice communication control systems based on TDM and IP dual bus, including IP phone 1, voice communication panel 2, network management terminal 3, external IP network 4, MPU unit 5, magnetite interface 6, EM interface 7, FXO interface 8 and FXS interface 9；The IP phone 1, voice communication panel 2, network management terminal 3 and external IP network 4 are IP Side passes through IP bus link MPU unit 5；Magnetite interface 6, EM interface 7, FXO interface 8 and FXS interface 9 are the side TDM, are passed through TDM bus link MPU unit 5；The voice communication panel 2 is communication terminal；The network management terminal 3 realizes system monitoring Management, external IP network 4 realize system external interconnection；Magnetite interface 6, EM interface 7, FXO interface 8 and FXS interface 9 be based on The analogue user interface of TDM bus.The MPU5 includes CPU module 51, IP Switching Module 52, serial ports processing module 53, DSP mould Block 54, meeting processing module 55, TDM-RTP conversion module 56 and TDM Switching Module 57；The CPU module 51 is separately connected IP Switching Module 52, serial ports processing module 53, DSP module 54, meeting processing module 55 and TDM Switching Module 57；The IP Switching Module 52 is separately connected IP phone 1, voice communication panel 2, network management terminal 3 and external IP network 4, and passes through TDM- RTP conversion module 56 connects TDM Switching Module 57；The serial ports processing module 53 is separately connected magnetite interface by serial bus 6, EM interface 7, FXO interface 8 and FXS interface 9；The DSP module 54 connects TDM Switching Module 57 by TDM bus；It is described Meeting processing module 55 connects TDM Switching Module 57 by on-chip bus；The TDM Switching Module 57 is distinguished by TDM bus Connect magnetite interface 6, EM interface 7, FXO interface 8 and FXS interface 9；IP Switching Module 52 realizes the exchange control of voice packets； Meeting processing module 55 realizes the speech sound mixing function between different user, supports the echo cancelltion in 512 channels, echo cancelltion duration For 32ms；The TDM-RTP conversion module 56 realizes the media format conversion between RTP and TDM；The TDM Switching Module 57 Media stream transition, distribution, fusion between realization different user, realize transmission of the speech between different user.
IP phone 1 can by network interface to MPU register, after succeeding in registration can by dialing numbers realize with system in its The Speech Communication of his user.
Voice communication panel 2 is the important terminal device of system, is that commander realizes ground by network interface access system The primary human interface and means of communication of ground Speech Communication and air-ground Speech Communication.
Network management terminal 3 is the important administration interface of system, and by network interface access system, realization sets system The functions such as the monitoring management of received shipment row, parameter configuration management.
External IP network 4 realizes that this system and external same type system interconnect, by Session Initiation Protocol, if realization is trans-regional Sound communication function.
MPU unit 5 includes CPU module 51, IP Switching Module 52, serial ports processing module 53, DSP module 54, meeting processing Module 55, TDM-RTP conversion module 56, TDM Switching Module 57.
CPU module 51 is realized using high-performance A8 processor, with size is small, low in energy consumption, operating temperature range is wide, stablizes Property it is high, connect the features such as fast speed, strong antijamming capability.
IP Switching Module 52, meeting processing module 55, TDM-RTP conversion module 56, TDM Switching Module 57 pass through great Rong The fpga chip realization of amount, high-speed, high-performance, low delay, wherein IP Switching Module 52 realizes the exchange control of voice packets； Meeting processing module 55 realizes the speech sound mixing function between different user, supports the echo cancelltion in 512 channels, echo cancelltion duration For 32ms；TDM-RTP conversion module 56 realizes the media format conversion between RTP and TDM, supports G.711A/U, G.723.1 G.729 (5.3/6.3k), the voice codings agreement such as；TDM Switching Module 57 realize different user between media stream transition, distribution, Transmission of the speech between different user is realized in fusion.Serial ports processing module 53 is using the realization of ARM7 chip, certainly using ARM7 chip The High Speed Serial realization of band is communicated with the information order of other interfaces, can obtain the operating status of each interface, and reception respectively connects The data that mouth reports, while various control commands are assigned, realize unified management of the MPU to each interface.DSP module 54 is by DSP Chip is realized, the DTMF/MFC/FSK transmitting-receiving of 64 road TDM signals may be implemented.
Magnetite interface 6 has the detectability for externally sending ringing-current, external ringing-current incoming signal for accessing magnetic telephone And Tone Via ability.
EM interface 7 can between other switching networks EM relay interconnection, complete the EM between this system and external switching network Foundation, voice signal access, signaling control and the transmission of repeated link.EM interface can be mutual with the radio station with EM interface simultaneously Connection is realized and receives and dispatches control to the speech in radio station.
FXO interface 8 can be interconnected with the FXS interface between other switching networks (PBX/PSTN etc.), for completing this system Foundation, voice signal access, signaling control and the transmission of analog junction link between external switching network.
FXS interface 9 realizes voice signal access, the signaling control of simulation common-battery phone for accessing simulation common-battery phone With transmission.
The workflow of voice communication control system based on TDM and IP dual bus of the invention are as follows: after system power-up, CPU module 51 in MPU unit 5 carries out initial work to other modules, after completing initial work, passes through IP Switching Module 52 receive the user's registration information from IP bus, the registration letter including IP phone 1, voice communication panel 2 and external IP network 4 Breath, realizes resource allocation, the status monitoring of IP user；By serial ports processing module 53 receive from magnetite interface 6, EM interface 7, The initialization information of FXO interface 8, FXS interface 9 realizes resource allocation to above-mentioned analog interface, status monitoring.
When the side IP user issues call request, which is received by IP Switching Module 52 and issues CPU module 51, CPU Module 51 judges callee's type, if callee remains as the side IP user, searches called routing letter by IP Switching Module 52 Breath establishes calling；If callee is the side TDM user, CPU module 51 is total using High Speed Serial by serial ports processing module 53 Line connects called time slot to called transmission signaling information, by TDM-RTP conversion module 56 and TDM Switching Module 57, realizes logical Words.
When the side TDM user issues call request, caller state parameter is obtained by serial ports processing module 53, passes through DSP Module 54 carries out transmitting-receiving number processing, and CPU module 51 obtains the information of serial ports processing module 53 and DSP module 54, judges callee Type, if callee remains as the side TDM user, CPU module 51 by serial ports processing module 53 to called transmission signaling information, Called time slot is connected by TDM Switching Module 57, realizes call；If callee is the side IP user, CPU module 51 is handed over by IP It changes the mold block 52 and searches called routing iinformation, realize call.
When user each in system needs to hold a meeting, it is logical that the speech of the side IP user needs uniformly to be converted into TDM format It crosses meeting processing module 55 and carries out audio mixing, the sound after audio mixing is sent to simulation by TDM bus by TDM Switching Module 57 again and uses Family interface, or IP Switching Module 52 is recycled to by on-chip bus, the side IP is distributed to by IP bus by IP Switching Module 52 User realizes Multi-Party Conference function.
The present invention provides a kind of voice communication control systems based on TDM and IP dual bus, implement the technical side There are many method and approach of case, the above is only a preferred embodiment of the present invention, it is noted that for the art For those of ordinary skill, various improvements and modifications may be made without departing from the principle of the present invention, these improvement It also should be regarded as protection scope of the present invention with retouching.The available prior art of each component part being not known in the present embodiment is subject to It realizes.

Claims (1)

1. a kind of voice communication control system based on TDM and IP dual bus, which is characterized in that logical including IP phone (1), voice Believe panel (2), network management terminal (3), external IP network (4), MPU unit (5), magnetite interface (6), EM interface (7), FXO Interface (8) and FXS interface (9)；
The IP phone (1), voice communication panel (2), network management terminal (3) and external IP network (4) are the side IP, pass through IP Bus link MPU unit (5)；
Magnetite interface (6), EM interface (7), FXO interface (8) and FXS interface (9) are the side TDM, pass through TDM bus link MPU Unit (5)；
The voice communication panel (2) is communication terminal；
The network management terminal (3) realizes system monitoring management, and external IP network (4) shows system external interconnection；
Magnetite interface (6), EM interface (7), FXO interface (8) and FXS interface (9) are that the analog subscriber based on TDM bus connects Mouthful；
The MPU (5) includes CPU module (51), IP Switching Module (52), serial ports processing module (53), DSP module (54), meeting Discuss processing module (55), TDM-RTP conversion module (56) and TDM Switching Module (57)；The CPU module (51) is separately connected IP Switching Module (52), serial ports processing module (53), DSP module (54), meeting processing module (55) and TDM Switching Module (57)；The IP Switching Module (52) is separately connected IP phone (1), voice communication panel (2), network management terminal (3) and outer Portion's IP network (4), and pass through TDM-RTP conversion module (56) connection TDM Switching Module (57)；The serial ports processing module (53) Magnetite interface (6), EM interface (7), FXO interface (8) and FXS interface (9) are separately connected by serial bus；The DSP mould Block (54) passes through TDM bus connection TDM Switching Module (57)；The meeting processing module (55) connects TDM by on-chip bus Switching Module (57)；The TDM Switching Module (57) is separately connected magnetite interface (6), EM interface (7), FXO by TDM bus Interface (8) and FXS interface (9)；
IP Switching Module (52) realizes the exchange control of voice packets；
Meeting processing module (55) realizes the speech sound mixing function between different user, supports the echo cancelltion in 512 channels, and echo is supported A length of 32ms when disappearing；
TDM-RTP conversion module (56) realizes the media format conversion between RTP and TDM；
Media stream transition, distribution, fusion between TDM Switching Module (57) realization different user, realize speech between different user Transmission；
Magnetite interface can externally send ringing-current, detect external ringing-current incoming signal and carry out speech for accessing magnetic telephone Transmission；
EM interface EM relay interconnection, the EM completed between this system and external switching network can relay chain between other switching networks Foundation, voice signal access, signaling control and the transmission on road；EM interface can be interconnected with the radio station with EM interface simultaneously, real Control now is received and dispatched to the speech in radio station；
FXO interface can be interconnected with the FXS interface of other switching networks, for completing the simulation between this system and external switching network Foundation, voice signal access, signaling control and the transmission of repeated link；
FXS interface is realized the voice signal access for simulating common-battery phone, signaling control and is passed for accessing simulation common-battery phone It is defeated；
The voice communication control system based on TDM and IP dual bus, comprising the following steps:
CPU module initialization in MPU unit receives the user's registration information from IP bus by IP Switching Module, including The registration information of IP phone, voice communication panel and external IP network, realizes resource allocation, the status monitoring of IP user；CPU mould Block receives the initialization information from magnetite interface, EM interface, FXO interface and FXS interface by serial ports processing module, realizes Resource allocation, status monitoring to above-mentioned analog interface；
When the side IP user issues call request, which is received by IP Switching Module and issues CPU module, CPU module judgement Callee's type searches called routing iinformation by IP Switching Module, establishes calling if callee remains as the side IP user； If callee is the side TDM user, CPU module is sent signaling to callee using serial bus and is believed by serial ports processing module Breath connects called time slot by TDM-RTP conversion module and TDM Switching Module, realizes call；
When the side TDM user issues call request, CPU module obtains caller state parameter by serial ports processing module, passes through DSP Module carries out transmitting-receiving number processing, and CPU module obtains the information of serial ports processing module and DSP module, judges callee's type, if by When the side of crying remains as the side TDM user, CPU module, to called transmission signaling information, passes through TDM interchange mode by serial ports processing module Block connects called time slot, realizes call；If callee is the side IP user, CPU module searches called road by IP Switching Module By information, call is realized；
When each user needs to hold a meeting, the speech of the side IP user is uniformly converted into TDM format and passes through meeting processing module Audio mixing is carried out, the sound after audio mixing is sent to analogue user interface by TDM bus by TDM Switching Module again, or by piece Bus is recycled to IP Switching Module, is distributed to the side IP user by IP bus by IP Switching Module, realizes Multi-Party Conference function；
IP Switching Module (52), meeting processing module (55), TDM-RTP conversion module (56), TDM Switching Module (57) pass through Fpga chip is realized.
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