sipRFC3261-cn.pdf
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2010-08-07
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1、SIP协议介绍...............................................................................................................9
2、SIP协议功能概况.......................................................................................................9
3、术语...........................................................................................................................10
4、实施概览...................................................................................................................10
5、协议的结构...............................................................................................................15
6、协议的定义...............................................................................................................17
7、SIP消息：.................................................................................................................22
7．1 请求...............................................................................................................22
7．2 应答................................................................................................................23
7.3 头域..................................................................................................................23
7.3.1 头域格式。..........................................................................................23
7.3.2 头域分类。..........................................................................................25
7.3.3 缩写格式..............................................................................................25
7.4 包体...................................................................................................................26
7.4.1 消息正文类型(MessageBodyType) .................................................26
7.4.2 消息体长度..........................................................................................26
7.5 分帧的SIP消息（Framing SIP Messages） ...................................................26
8 一般用户代理行为 ....................................................................................................27
8.1 UAC特性 ..........................................................................................................27
8.1.1 产生一个请求......................................................................................27
8.1.1.1 Request-URI................................................................................28
8.1.1.2 TO................................................................................................28
8.1.1.3 From............................................................................................28
8.1.1.4 Call-ID.........................................................................................29
8.1.1.5 Cseq.............................................................................................29
8.1.1.6 Max-Forwards.............................................................................30
8.1.1.7 Via ...............................................................................................30
8.1.1.8 Contact ........................................................................................30
8.1.1.9 Supported 和 Require................................................................30
8.1.1.10 附加信息部分..........................................................................31
8.1.2 发送一个请求.......................................................................................31
8.1.3 处理应答..............................................................................................31
8.1.3.1: transaction 层的错误 ................................................................32
8.1.3.2 未知的应答................................................................................32
8.1.3.3 Vias..............................................................................................32
8.1.3.4 处理 3xx应答.............................................................................32
8.1.3.5 处理 4xx应答......................................................................33
8.2 UAS特性...........................................................................................................34
8.2.1 方法判定.......................................................................................34
8.2.2 包头判断.......................................................................................34
8.2.2.1 TO 和Request-URI.........................................................34
8.2.2.2 合并的请求.......................................................................35
8.2.2.3 Require ................................................................................35
8.2.3 内容处理.......................................................................................35
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