Yealink SIP-T48G - Manual (Page 112)

User Guide for the SIP-T48G IP Phone
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4. Tap the Save soft key to accept the change.
The icon appears on the status bar, and the associated line icon changes
to .
Incoming calls on the specific line will be rejected automatically, and the touch
screen will prompt "n New Missed Call(s)" ("n" indicates the number of the missed
calls).
To activate DND in custom mode for all accounts:
1. Tap .
The touch screen displays a list of accounts registered on the phone.
2. Tap the All On soft key to activate DND for all accounts.
3. Tap to return to the idle screen.
The icon appears on the status bar, and all line icons change to .