AT&T 1040 - Manual (Page 21)

15
Telephone operation
Basic phone operation
DO NOT DISTURB
When you activate the do not disturb ( DND)
function, you will not hear paging tones, voice
paging, or incoming call rings.
Instead, the LINE light flashes to signal an
incoming call. If you receive an intercom call, the
[INTERCOM] light flashes, and the number of the
incoming intercom call appears on the display.
1. Press [DO NOT DISTURB] twice to prevent
interruptions. The DO NOT DISTURB light goes on
and the screen includes DND.
2. Press [DO NOT DISTURB] again to resume
normal call alerts. The DO NOT DISTURB light
goes off and the screen no longer shows DND.
Callers will hear very long beeps, the same tone
as if the system phone is ringing normally.