这是一个用C-C++实现的成熟的sip协议栈，目前正在稳定的使用，可同时运行于windows和linux平台，里面还有比较详细的帮助文档。-This is a C-C realization of the mature sip protocol stack and is currently stable use, can also run on Windows and Linux platforms, there is also a more detailed help files.

这是一个用C-C++实现的成熟的ppp服务器和协议栈，目前正在稳定的使用，可同时运行于windows和linux和solaris平台，里面还有比较详细的帮助文档。-This is a C-C realization of the mature ppp server and protocol stack and is currently stable use, can also run on windows and linux and solaris platform, there is also

μC-TCP/IP 源码，可用来学习TCP/IP及嵌入式协议栈的的实现-source μC-TCP/IP, can be used to learn TCP/IP and embedded protocol stack to achieve