AT&T MERLIN Plus Training Manual page 19

To place an internal call:
Action
1.
Touch the Intercom button.
(If the green light next to the
Intercom button is on, the Intercom
line is in use. Wait until the light
goes off to make your call.)
2. Lift the handset.
3. Dial the intercom number. The
Telephone Administrator or the
Attendant has a list of Intercom
numbers for the office.
4. Conduct the conversation, then
hang up.
Note: If you begin dialing an Intercom Number, but don't complete the call within 15
seconds from the time you lift the handset, the call is cancelled and the Intercom
lights go off.
Result
The red light next to the Intercom
button comes on.
The green Intercom light comes
on. (Both lights are on.)
The call is made.
When you hang up, the Intercom
lights go off.
13