GE 29115 Series - Manual (Page 53)

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NOTE: The system is expandable up to 4
handsets (by purchase of optional Model
29110 handset with recharge cradle). When
4 handsets are registered, the system can
handle 2 separate intercom operations at once,
for example, 1st handset intercoms with 2nd
handset while 3rd handset intercoms with 4th
handset.
Receiving an Intercom Call
When you receive an intercom call, your handset beeps.
To answer the call press the int button or TALK/CALL BACK
button.
Advanced Intercom Features
Receiving an Incoming Call During an
Intercom Call
If you receive a telephone call during an intercom call, the
intercom call is immediately terminated and both handsets
ring. Either handset user may press the TALK/CALL BACK
button to answer the call.