Yealink SIP-T2 Series

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