Yealink SIP-T21 E2 Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
xviii
Table of Contents
Introduction.................................................................................... v
About This Guide ....................................................................................................................................................................... v
Chapters in This Guide ............................................................................................................................................................. v
Related Documentations ....................................................................................................................................................... vi
Conventions Used in Yealink Documentations ........................................................................................................... vii
Reading the Configuration Parameter Tables .............................................................................................................. vii
Summary Table Format ............................................................................................................................................... viii
Configuration Parameter Table Format .................................................................................................................. ix
Recommended References ................................................................................................................................................... xi
Understanding VoIP Principle and SIP Components ................................................................................................ xii
VoIP Principle ................................................................................................................................................................... xii
SIP Components ............................................................................................................................................................. xiii
Summary of Changes ............................................................................................................................................................ xiv
Changes for Release 81, Guide Version 81.91 ................................................................................................... xiv
Changes for Release 81, Guide Version 81.90 ................................................................................................... xiv
Changes for Release 81, Guide Version 81.71 .................................................................................................... xv
Changes for Release 81, Guide Version 81.70 .................................................................................................... xv
Changes for Release 81, Guide Version 81.20 ................................................................................................... xvi
Changes for Release 81, Guide Version 81.15 ................................................................................................... xvi
Table of Contents ...................................................................... xviii
Product Overview .......................................................................... 1
SIP IP Phone Models ................................................................................................................................................................. 1
Physical Features of IP Phones .................................................................................................................................... 1
Key Features of IP Phones .......................................................................................................................................... 15
Expansion Modules ................................................................................................................................................................ 17
Getting Started ............................................................................. 21
What IP Phones Need to Meet .......................................................................................................................................... 21
Yealink IP Phones in a Network ........................................................................................................................................ 21
Connecting the IP Phones ................................................................................................................................................... 22
Attaching the Stand and the Optional Wall Mount Bracket (not Applicable to CP860/CP920 IP
phones) .............................................................................................................................................................................. 23
Connecting the Handset and Optional Headset (not Applicable to CP860/CP920 IP phones) ... 31
Connecting the Power and Network ..................................................................................................................... 33

Yealink SIP-T21 E2 Specifications

General

Brand	Yealink
Model	SIP-T21 E2
Category	IP Phone
Language	English