Yealink SIP-T2XP

Administrator’s Guide for SIP-T2xP IP Phones
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Appendix C: SIP (Session Initiation Protocol) ............................................................................ 177
RFC and Internet Draft Support .......................................................................................... 178
SIP Request ............................................................................................................................ 179
SIP Header ............................................................................................................................ 180
SIP Responses ....................................................................................................................... 181
SIP Session Description Protocol (SDP) Usage .................................................................. 184
Appendix D: SIP Call Flows ........................................................................................................ 184
Successful Call Setup and Disconnect ............................................................................... 185
Unsuccessful Call Setup—Called User is Busy .................................................................. 188
Unsuccessful Call Setup—Called User Does Not Answer ................................................ 191
Successful Call Setup and Call Hold .................................................................................. 194
Successful Call Setup and Call Waiting ............................................................................. 197
Call Transfer without Consultation ...................................................................................... 202
Call Transfer with Consultation ............................................................................................ 207
Always Call Forward ............................................................................................................ 213
Busy Call Forward ................................................................................................................ 216
No Answer Call Forward ..................................................................................................... 219
Call Conference .................................................................................................................... 222
Appendix E: Sample Configuration File .................................................................................... 227
Index ......................................................................................233