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Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series IP Phones

xxiv

RFC and Internet Draft Support ............................................................................................................................. 984

SIP Request..................................................................................................................................................................... 987

SIP Header ...................................................................................................................................................................... 988

SIP Responses ............................................................................................................................................................... 989

SIP Session Description Protocol (SDP) Usage ................................................................................................ 992

Appendix I: SIP Call Flows .................................................................................................................................................. 992

Successful Call Setup and Disconnect ................................................................................................................ 993

Unsuccessful Call Setup—Called User is Busy .................................................................................................. 995

Unsuccessful Call Setup—Called User Does Not Answer ............................................................................ 997

Successful Call Setup and Call Hold .................................................................................................................... 999

Successful Call Setup and Call Waiting ........................................................................................................... 1002

Call Transfer without Consultation .................................................................................................................... 1006

Call Transfer with Consultation ........................................................................................................................... 1010

Always Call Forward ................................................................................................................................................. 1015

Busy Call Forward ..................................................................................................................................................... 1017

No Answer Call Forward ........................................................................................................................................ 1020

Call Conference ......................................................................................................................................................... 1023

Index ......................................................................................... 1029