基于SIP协议的VOIP用户代理研究

摘要

为了解决传统的VOIP系统组网复杂、灵活性不佳的问题，对目前的SIP技术和STUN技术进行了研究。利用STUN技术解决了内网IP端口到公网IP端口转换问题。以开源LumisoftSIP为核心，结合RTP／RTCP相关技术，设计了一种基于SIP协议的VOIPUA用户代理系统模型。实现了通过访问网络上的SIP用户代理或者SIP音乐服务器，为网络用户提供便捷的网络语音、音乐点播等服务。实验表明，基于SIP的VOIP网络结构更简单，更灵活。%On the purpose of solving the traditional problems of VOIP system ,which are complicated and inflexible.Some newly proposed methods basing on SIP and STUN are studied and made an ideal performances in switching from private IP port to the public IP port .Open-source SIP protocol stacks is the core of this design. Combining with the RTP/RTCP technology, the user agent system prototype is implemented. When call on the subscriber who using the SIP UA or the music server based on the SIP, to provide the VOIP service or online music service conveniently. Test result verified the VOIP network structure based on the SIP is simpler and more flexible.