SIP的一种协议栈开源代码，纯C写的，linux下轻松编译通过，生成可用的库-A SIP protocol stack open source code, written in pure C, linux under easily compile, generate usable libraries

Live555是一个为流媒体提供解决方案的跨平台的 C++开源项目，它实现了对标准流媒体传输协议如RTP/RTCP、RTSP、SIP等的支持。-(See also the "LIVE555 Proxy Server".) LIVE555 Streaming Media Source-code libraries for standards-based RTP/RTCP/RTSP/SIP multimedia streaming,

一个小巧，性能不错的sip协议栈，c语言编写： * Minimalistic and modular VoIP client * SIP, SDP, RTP/RTCP, STUN/TURN/ICE * IPv4 and IPv6 support * RFC-compliancy * Robust, fast, low footprint * Portable C89 and C99 source code-* Minimalistic and modular VoIP c