Q.931协议分析培训教材 Q.931协议分析 目 录 1 Q.931及Q.921概述 ................................................ 1 1.1 第二层和第三层提供的功能及接口 .......................................................................... 1 1.2 Q .921帧结构及规程单元和字段的格式 .................................................................... 2 1.2.1 Q .921帧结构 ............................................................................................... 2 1.2.2 Q .921规程单元及字段的格式 ..................................................................... 3 1.2.2.1 Flag ................................................... 3 1.2.2.2 Address ................................................ 3 1.2.2.3 Control ................................................ 5 1.3 小结 ......................................................................................................................... 7 2 Q.931协议分析 ................................................... 8 2.1 Q .931呼叫流程消息 ................................................................................................. 8 2.1.1 消息功能定义及内容概述 ............................................................................ 9 2.1.2 各消息功能定义及内容 ............................................................................. 12 2.1.2.1 SETUP ................................................. 12 2.1.2.2 CALL PROC ............................................. 14 2.1.2.3 INFO、FACILTY ......................................... 15 2.1.2.4 ALERT ................................................. 18 2.1.2.5 CONN .................................................. 20 2.1.2.6 CONN ACK .............................................. 21 Q.931协议分析培训教材 2.1.2.7 DISC （DISCONNECT） .................................. 22 2.1.2.8 REL ................................................... 24 2.1.2.9 REL COM .............................
