基于 SIP 开源协议栈下用户代理的应用与实现

摘要

Osip2 and eXosip2 both are very light and handy SIP(Session Initiation Protocol) based open protocol stacks . Many practical SIP terminal systems can be built based on them .The compiling and usage methods of these 2 protocol stacks are introduced .The development methods and functional characteristics of user agent in GB/T 28181 supported SIP applica‐tion systems such as client‐side plugins ,proxy gateway ,media servers and other SIP systems are discussed .In the GB/T 28181 standard SIP application system ,according to the development and actual integration test of each UA's prototype ,the expected effects have been achieved .With these UA ,the SIP system can achieve the functions stipulated in GB/T 28181 such as registration ,heartbeat ,real‐time video on demand and so on .These UA components have been widely used in many video surveillance network systems all over China .%Osip2和eXosip2协议栈都是非常轻巧的基于SIP的开源协议栈，基于它们可以构建许多实用的SIP终端系统。介绍了Osip2和eXosip2协议栈的编译和使用方法，并在此基础上对支持GB／T 28181标准的SIP应用系统中各关键部件用户代理（UA）的开发方法和功能特点进行了讨论。结合符合GB／T 28181标准的SIP应用系统，对论文设计的客户端插件、媒体服务器和代理网关等UA进行了实际测试，效果良好，可完成国标中规定注册、心跳、实时点播、录像、历史回放下载等功能。设计的UA部件在全国多个监控联网系统中得到了广泛应用。