86
Appendix A
Session Initiation Protocol (SIP)
Chapter contents
Overview
...............................................................................................................................................................87
SIP Messages
.........................................................................................................................................................87
Methods
..........................................................................................................................................................88
Response Codes
..............................................................................................................................................89
Message Headers
.............................................................................................................................................90
Sample SIP Message
........................................................................................................................................90
Message Flow Examples
..................................................................................................................................90
Call setup
..................................................................................................................................................91
Call teardown
............................................................................................................................................91
Successful blind transfer
............................................................................................................................91
Successful consultative transfer
..................................................................................................................92
SIP URLs
........................................................................................................................................................92
SIP Transactions
....................................................................................................................................................93
SIP Sessions
...........................................................................................................................................................93
SIP Calls
................................................................................................................................................................93
Caller ID
...................................................................................................................................................93
System Components
..............................................................................................................................................94