Yealink SIP-T46G - Manual (Page 105)

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 idle screen indicates that DND is enabled.
Incoming calls will be rejected automatically and "n New Missed Call(s)" ("n"
indicates the number of the missed calls) will appear on the LCD screen.
To activate DND in custom mode for a specific account:
1. Press the DND soft key when the phone is idle.
DND mode is configurable via web user interface only.