Yealink SIP-T21 - Manual (Page 84)

User Guide for the SIP-T21P/SIP-T21 IP Phone
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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.
The LCD screen displays a list of accounts on the phone.
2. Press or to select the desired account.
3. Press or soft key to select On to active DND.
4. Press the Save soft key to accept the change.
The icon appears on the idle screen and the associated line icon changes
to .
Incoming calls on this line 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 all accounts:
1. Press the DND soft key when the phone is idle.