Yealink SIP-T27P [16/841] Index 23

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

xvi

long distance number without plus 0? ................................................................................ 740

What communication protocols and ports do Yealink IP phones support? .................... 741

What is the difference between enabling and disabling the RFC 2543 Hold feature? . 744

How can I verify the firmware generation and version of the phone? ........................... 745

Appendix ...............................................................................747

Appendix A: Glossary ................................................................................................................. 747

Appendix B: Time Zones ............................................................................................................. 749

Appendix C: Trusted Certificates ............................................................................................... 750

Appendix D: Configuring DSS Key ............................................................................................. 751

Appendix E: Auto Provisioning Flowchart (Keep user personalized configuration settings)767

Appendix F: Configurations Defined Never be Saved to <MAC>-local.cfg file .................. 768

Appendix G: SIP (Session Initiation Protocol) ........................................................................... 775

RFC and Internet Draft Support .......................................................................................... 775

SIP Request ............................................................................................................................ 778

SIP Header ............................................................................................................................ 779

SIP Responses ....................................................................................................................... 781

SIP Session Description Protocol (SDP) Usage .................................................................. 783

Appendix H: SIP Call Flows ........................................................................................................ 784

Successful Call Setup and Disconnect ............................................................................... 784

Unsuccessful Call Setup—Called User is Busy .................................................................. 787

Unsuccessful Call Setup—Called User Does Not Answer ................................................ 789

Successful Call Setup and Call Hold .................................................................................. 791

Successful Call Setup and Call Waiting ............................................................................. 794

Call Transfer without Consultation ...................................................................................... 799

Call Transfer with Consultation ............................................................................................ 803

Always Call Forward ............................................................................................................ 808

Busy Call Forward ................................................................................................................ 811

No Answer Call Forward ..................................................................................................... 814

Call Conference .................................................................................................................... 817

Index ......................................................................................823