Yealink SIP-T2 Series Administrator's Manual

Also see for SIP-T2 Series: Administrator's guide Provisioning guide Administrator's guide Administrator's guide Administrator's guide

Contents

Yealink SIP-T2 Series Administrator's Manual Manual pdf 11 page image

Table of ContentsxiTroubleshooting Solutions ........................................................................................................... 460Why is the LCD screen blank? ............................................................................................. 460Why doesn’t the IP phone get an IP address? ................................................................... 460Why does the IP phone display “No Service”? ................................................................. 461How do I find the basic information of the IP phone? ....................................................... 461Why doesn’t the IP phone upgrade firmware successfully? ............................................. 461Why doesn’t the IP phone display time and date correctly? ........................................... 461Why do I get poor sound quality during a call? ................................................................ 461What is the difference between a remote phone book and a local phone book? ....... 462What is the difference among user name, register name and display name? ............. 462How to reboot the IP phone remotely? .............................................................................. 462Why does the IP phone use DOB format logo file instead of popular BMP, JPG and so on?................................................................................................................................................ 463How to increase or decrease the volume? ........................................................................ 463What is auto provisioning? .................................................................................................. 463What is PnP? .......................................................................................................................... 463Why doesn’t the IP phone update the configuration? ...................................................... 463What do “on code” and “off code” mean? ....................................................................... 464How to solve the IP conflict problem? ................................................................................ 464How to reset the IP phone to factory configurations? ....................................................... 464How to restore the administrator password? .................................................................... 465Appendix ...............................................................................466Appendix A: Glossary ................................................................................................................. 466Appendix B: Time Zones ............................................................................................................. 468Appendix C: Trusted Certificates ............................................................................................... 470Appendix D: Configuring DSS Key ............................................................................................. 471Appendix E: SIP (Session Initiation Protocol) ............................................................................ 479RFC and Internet Draft Support .......................................................................................... 479SIP Request ............................................................................................................................ 482SIP Header ............................................................................................................................ 483SIP Responses ....................................................................................................................... 484SIP Session Description Protocol (SDP) Usage .................................................................. 487Appendix F: SIP Call Flows ......................................................................................................... 487Successful Call Setup and Disconnect ............................................................................... 488Unsuccessful Call Setup—Called User is Busy .................................................................. 491Unsuccessful Call Setup—Called User Does Not Answer ................................................ 493Successful Call Setup and Call Hold .................................................................................. 495Successful Call Setup and Call Waiting ............................................................................. 498Call Transfer without Consultation ...................................................................................... 503Call Transfer with Consultation ............................................................................................ 507Always Call Forward ............................................................................................................ 512Busy Call Forward ................................................................................................................ 516No Answer Call Forward ..................................................................................................... 519