AT&T 1040 Quick Reference Manual page 12

0:0AM /
EXT 
INTERCOM FROM 
Intercom
Answer an intercom call
Use this feature to answer an intercom call. When
you receive an intercom call, you hear a repeating
double-ring pattern and your screen displays
INTERCOM FROM with the extension number of
the caller. Answer the intercom call by lifting the
handset, or by pressing [INTERCOM],
[ SPEAKER] or [HEADSET] to take the call
hands-free.
NOTE: If you press [INTERCOM] to answer
the call, the phone uses the mode (speakerphone
or headset) you programmed as the automatic
mode (see AUTOMATIC MODE of your installation
guide).
End an intercom or page call
Use this feature to end the intercom or page call.
• Press [INTERCOM].
-OR-
Hang up or press [
•
again.

SPEAKER] or [HEADSET]