Yealink SIP-T21P User Manual

Basic Call Features
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The LCD screen displays a list of the accounts on the phone.
2. Press the All On soft key to activate DND for all accounts.
3. Press the Save soft key to accept the change.
The icon appears on the idle screen and all line icons change to .
Incoming calls will be rejected automatically and "n New Missed Call(s)" ("n"
indicates the number of the missed calls) will appear on the LCD screen.
Note
To configure the DND authorized numbers via web user interface:
1. Click on Features->Forward & DND.
2. Select Enabled from the pull-down list of DND Emergency.
The prompt message displays only if Missed Call Log for the line is enabled. Missed Call
Log is configurable via web user interface at the path Account->Basic.
Do Not Disturb is local to the phone, and may be overridden by the server settings. For
more information, contact your system administrator.

Yealink SIP-T21P Specifications

General

Display	132 x 64-pixel graphical LCD
Network	10/100 Mbps Ethernet
SIP Accounts	2
Wall Mountable	Yes
Audio Features	HD Voice
Protocols	SIP v1 (RFC2543), v2 (RFC3261)
Voice Codecs	G.711(A/μ), G.729AB, G.726, G.722
Phonebook	1000 entries
Call Features	Call hold, call waiting, call transfer, call forward, 3-way conferencing
Security	SRTP, TLS, 802.1x, HTTPS
Ethernet Ports	2 x RJ45 10/100 Mbps
Power Supply	Power over Ethernet (PoE) or optional power adapter
Operating Humidity	10% to 90% (non-condensing)
Languages	Supports multiple languages
PoE	Yes (802.3af)
Operating Temperature	-10°C to 50°C