Yealink SIP-T21 - Manual (Page 56)

User Guide for the SIP-T21P/SIP-T21 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/SIP-T21 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.