Yealink SIP-T21P User Manual

Basic Call Features
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1. Press the Ok soft key, the phone returns to the idle screen and call completion is
activated.
When the called party becomes idle, the following prompt appears on the LCD
screen of the phone:
2. Press the Ok soft key to redial the number.
Note
You can press a call return key to place a call back to the last incoming call.
To configure a call return key via phone user interface:
1. Press Menu->Features->DSS Keys.
2. Select a desired DSS key.
3. Press or , or the Switch soft key to select Key Event from the Type field.
4. Press or , or the Switch soft key to select Call Return from the Key Type field.
5. Press the Save soft key to accept the change or the Back soft key to cancel.
Call return key is configurable via web user interface at the path DSSKey->Line Key.
You can mute the microphone of the active audio device during an active call, and then
the other party cannot hear you.
To mute a call:
1. Press during an active call.
Call completion is not available on all servers. 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