Yealink SIP-T21 E2 - Page 99

Basic Call Features
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2. In the DND block, mark the desired radio box in the Mode field.
3. Click Confirm to accept the change.
Note
To activate DND in phone mode:
1. Press the DND soft key when the phone is idle.
The icon on the status bar indicates that DND is enabled.
DND mode is configurable via web user interface only.