基于OSIP协议栈实现的UA客户端和UA服务器端的基本实现文档（内含详细代码）。是SIP电话开发的有用参考,OSIP-based protocol stack to achieve the UA client and server-side UA to achieve the basic document (containing the code in detail). The development of SIP phones is a useful reference

A reference for SIP client source code