Yealink SIP-T21P User Manual

User Guide for the SIP-T21P IP Phone
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2. Select Enabled from the pull-down list of Headset Prior.
3. Click Confirm to accept the change.
To use headset prior feature, you should activate the headset mode in advance:
1. Physically connect the headset.
2. Press to activate the headset mode.
Note
Two types of DSS keys: Line Keys and Programmable Keys. The details will be introduced
in the following. The SIP-T21P IP phone supports 2 line keys.
You can assign predefined functionalities to the line keys to have quick access to
features such as call return and voice mail. The line key LEDs will indicate status when
the keys are assigned with particular features, such as BLF. The default key type of each
line key is Line.
If headset prior is enabled, the headset mode will not be deactivated until you press the
HEADSET key again.
Headset prior is configurable via web user interface only.

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