标准sip的ＲＦＣ３２６１文档，是开发基于sip的voip通信方案的必备手册.对其中的重点部分用红色进行了标记-Sip the RFC3261 standard documents, the development of voip in sip-based communications program manual required. The focus of some of them were marked in red

Internet Communications Using SIP Delivering VoIP

从系统结构上讲，本系统使用的是C/S结构。对于语音的采集、播放、压缩、解压以 及呼叫等各种控制都是在客户端实现，服务器端实现用户的注册、定位与信息转发等功能，这样就将系统复杂度放在了客户端，实现了分布式的控制模式。-Terms of structure from the system, the system uses the C/S structure. For speech acquisition, playback, compression, decompression, and ca