IP电话的SIP协议栈技术标准资料。在开发过程中遇见人员开发意见不一致，都采用该标准作为参考，是一本协助开发移植SIP协议栈的好书-IP telephony SIP protocol stack technology standard data. Met the staff development of disagreement in the development process, the standards are used as a reference, an assist in the development of transplant SIP stack books