Yealink SIP-T21 E2

Table of Contents
xxv
System Log Issues ....................................................................................................................................................... 994
Resetting Issues ............................................................................................................................................................ 995
Rebooting Issues .......................................................................................................................................................... 998
Protocols and Ports Issues .................................................................................................................................... 1001
Password Issues ......................................................................................................................................................... 1004
Logo Issues .................................................................................................................................................................. 1004
Power and Startup Issues ...................................................................................................................................... 1004
Other Issues ................................................................................................................................................................ 1005
Appendix................................................................................... 1009
Appendix A: Glossary ........................................................................................................................................................ 1009
Appendix B: Time Zones ................................................................................................................................................. 1011
Appendix C: Trusted Certificates ................................................................................................................................. 1012
Appendix D: Configuring DSS Keys ............................................................................................................................ 1014
Appendix E: Auto Provisioning Flowchart (Keep User Personalized Configuration Settings) ........... 1036
Appendix F: Static Settings ............................................................................................................................................ 1037
Appendix G: Reading Icons ............................................................................................................................................ 1043
Appendix H: SIP (Session Initiation Protocol)......................................................................................................... 1053
RFC and Internet Draft Support .......................................................................................................................... 1053
SIP Request.................................................................................................................................................................. 1056
SIP Header ................................................................................................................................................................... 1057
SIP Responses ............................................................................................................................................................ 1058
SIP Session Description Protocol (SDP) Usage ............................................................................................. 1061
Appendix I: SIP Call Flows ............................................................................................................................................... 1061
Successful Call Setup and Disconnect ............................................................................................................. 1062
Unsuccessful Call Setup—Called User is Busy ............................................................................................... 1064
Unsuccessful Call Setup—Called User Does Not Answer ......................................................................... 1066
Successful Call Setup and Call Hold ................................................................................................................. 1068
Successful Call Setup and Call Waiting ........................................................................................................... 1071
Call Transfer without Consultation .................................................................................................................... 1075
Call Transfer with Consultation ........................................................................................................................... 1079
Always Call Forward ................................................................................................................................................. 1084
Busy Call Forward ..................................................................................................................................................... 1086
No Answer Call Forward ........................................................................................................................................ 1089
Call Conference ......................................................................................................................................................... 1092
Index ......................................................................................... 1097