sip 协议C源码，实现了send,receive, CRC,md5等功能-Sip protocol in C, functions of send,receive, crc, md5 were released in this project.

sip服务器原代码,要求在linux或者unix下安装,可以用于建立自己的voip系统,基于sip协议-OpenSIPS brings: robust and performant SIP (RFC3261) Registrar server, Location server, Proxy server and Redirect server small footprint- the binary file is small size, functionality can be stri

OpenSIPS是一个成熟的开源SIP服务器，除了提供基本的SIP代理及SIP路由功能外，还提供了一些应用级的功能。OpenSIPS的结构非常灵活，其核心路由功能完全通过脚本来实现，可灵活定制各种路由策略，可灵活应用于语音、视频通信、IM以及Presence等多种应用。同时OpenSIPS性能上是目前最快的SIP服务器之一，可用于电信级产品构建。-OpenSIPS is a mature open source SIP server, in addition to providing basic

opensips实现了媒体流rtp和语音流sip的加密，称为sips和srtp-opensips implements media streaming rtp and sip voice stream encryption, known as sips and srtp