RFC2543中文文档，学习SIP编程的基础东东，把这个搞懂，SIP就学会了~-RFC2543 Chinese document, the basis of programmed learning Dongdong SIP, they get to know this, SIP learned ~

SIP协议文档简体中文版。会话初始协议（Session Initiation Protocol）是一种信令协议，用于初始、管理和终止网络中的语音和视频会话，具体地说就是用来生成、修改和终结一个或多个参与者之间的会话。(Simplified Chinese version of the SIP protocol document. Session Initiation Protocol is a signaling protocol used to initiate, manage, and te