Yealink SIP-T20 - Manual (Page 74)

User Guide for the SIP-T20P/SIP-T20 IP Phone
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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 .
2. Select Features->DND Code.
3. Press or to select Phone Mode from the DND Account field.
4. Select Enable from the DND field.
5. (Optional.) Enter the DND on code and off code respectively in the DND On Code
and DND Off Code field.
6. Press to accept the change.
The icon on the idle screen indicates that DND is enabled.
2. DND:
◄ Enable ►
DND mode is configurable via web user interface only.