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

提供了linux协议栈的分析文档。对研究协议栈会很有帮助。