15
Telephone operation
Basic phone operation
DO NOT DISTURB
Use this feature to silence your telephone. 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 displays 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 hear very long beeps, the same tone as if 
the system phone is ringing normally.