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Administrator’s Guide for SIP-T2xP IP Phones
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Appendix E: SIP (Session Initiation Protocol) ............................................................................ 523
RFC and Internet Draft Support .......................................................................................... 523
SIP Request ............................................................................................................................ 526
SIP Header ............................................................................................................................ 527
SIP Responses ....................................................................................................................... 528
SIP Session Description Protocol (SDP) Usage .................................................................. 531
Appendix F: SIP Call Flows ......................................................................................................... 531
Successful Call Setup and Disconnect ............................................................................... 532
Unsuccessful Call Setup—Called User is Busy .................................................................. 534
Unsuccessful Call Setup—Called User Does Not Answer ................................................ 536
Successful Call Setup and Call Hold .................................................................................. 538
Successful Call Setup and Call Waiting ............................................................................. 541
Call Transfer without Consultation ...................................................................................... 545
Call Transfer with Consultation ............................................................................................ 550
Always Call Forward ............................................................................................................ 555
Busy Call Forward ................................................................................................................ 558
No Answer Call Forward ..................................................................................................... 561
Call Conference .................................................................................................................... 564
Index ......................................................................................569