Yealink SIP-T21 E2 Administrator's Guide

Introduction
xv
 Wi-Fi on page 70
 Bluetooth on page 209
 Call Recording on page 575
 Audio Codecs on page 854
 Appendix G: Reading Icons on page 1043
Changes for Release 81, Guide Version 81.71
Documentations of the newly released SIP-T54S/T52S, CP860 IP phones and EXP50 color-
screen expansion modules have been added.
The following sections are new for this version:
 Connecting the Optional Expansion PSTN Box CPN10 (Only Applicable to CP860/CP920 IP
Phones) on page 39
 Linekey Length in Short on page 221
 PSTN Account on page 233
 Idle Recording on page 577
 Cloud on page 581
Major updates have occurred to the following sections:
 Missed Call Log on page 347
 Auto Answer on page 385
 Call Recording on page 575
 Ring Tones on page 820
Changes for Release 81, Guide Version 81.70
Documentations of the newly released SIP-T40G IP phones have been added.
The following sections are new for this version:
 Page Switch Key on page 213
 Backing up the Call Log on page 343
Major updates have occurred to the following sections:
 Upgrading Firmware from the Provisioning Server on page 149
 Power Indicator LED on page 171
 Label Length on page 218
 Call Display on page 242
 Directory List on page 334
 Search Source List In Dialing on page 338
 Missed Call Log on page 347
 Customizing a Local Contact File on page 350

Yealink SIP-T21 E2 Specifications

General

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