NEC DS1000 Feature Handbook page 98

Do Not Disturb
3. Select the soft key for the DND type you want to select.
Dial a digit (
0
1
2
3
90
The first line of the display shows the currently
selected DND type.
) for the DND type you want to select.
0-3
OFF
(or
EXTERNAL
(or
INTERCOM
(or
ALL
(or
If you are on a call (or anytime your phone is not
idle), pressing DND automatically enables DND for
all calls (type 3). If DND is enabled, pressing DND
automatically disables DND.
When DND types 2 or 3 are enabled, Intercom
callers hear DND tone and see "DO NOT DIS-
TURB" in their telephone's display.
If you don't make an entry for 10 seconds:
- If DND is disabled, the system automatically
enables DND All Calls.
- If DND is enabled, the system automatically can-
cels DND.
OR
) = Cancels DND.
) = Incoming outside calls blocked
) = Incoming Intercom calls blocked
) = All calls blocked