轻量级数字集群电话网关的设计与实现

Design and Implementation of Lightweight Digital Trunked Radio PSTN Gateway

针对快速部署应用场景下的数字集群系统与有线电话系统的互联互通,对轻量级数字集群电话网关的软件总体设计方案进行了简要介绍,方案描述了链路管理模块、信令处理模块、媒体处理模块、服务监控模块和设备管理模块等五大组成部分。在总体设计方案的基础上,以陆上集群无线电(TETRA)数字集群和会话初始协议(SIP)软交换有线电话之间的电话网关为例,对信令映射适配和媒体转换两大核心问题进行了分析,提出了信令映射适配和媒体转换的设计和实现方法,并进行了系统集成测试,验证了设备的功能和性能,证明了设计的可行性。

For the intercommunication of digital trunked radio system and wired telephone system in the rapidly deployed applica- tion scenario,the software overall design solution of lightweight digital trunked radio PSTN gateway is briefly introduced.In the solution, the five component parts are described, such as link management module, signaling processing module, media processing module, service monitoring module, and equipment management module.On the basis of the overall design solution,by taking for example PSTN gateway between the Terrestrial Trunked Radio （TETRA） and the Session Initiation Protocol（SIP） softswitch wired telephone system, two key problems are analyzed,such as signaling mapping adaptation and media conversion,and the design and implementation methods of sig- naling mapping adaptation and media conversion are presented.The system integrated test for the implementation is carried out,which verifies the functions and performances of the equipment and proves the feasibility of this design.