Multiple handset use
Intercom
Use the intercom feature for conversations between handsets. You can buy additional expansion handsets (model AT&T CL80109) for this telephone base. You can register up to 12 handsets to the telephone base.
The first nine handsets that you register are named Handsets
Although the names for handsets
Using a cordless handset:
1. Press INT on your handset when not in use.
•If you have a single handset system, your handset screen shows CALLING BASE. The telephone base rings and its screen shows HANDSET X IS CALLING.
•If you have more than one handset, your screen shows INTERCOM TO: Enter a handset number, the screen then shows CALLING HANDSET X. The called handset rings and its screen shows either OTHER HANDSET IS CALLING or
HANDSET X IS CALLING.
Enter 0 to intercom with the telephone base. The screen shows CALLING BASE. The telephone base rings and its screen shows HANDSET X IS CALLING.
CALLING
OTHER HANDSET
OTHER HANDSET
IS CALLING
INTERCOM
2.To answer the intercom call, press 
PHONE/FLASH, INT, 
SPEAKER or any dial pad keys
INTERCOM.
Press 
SPEAKER or any dial pad key
3.To end the intercom call,
Press 
OFF/CLEAR or INT on either handset, or place the handset in the charger.
Press INTERCOM/HANDSET LOCATOR or CLEAR on the telephone base if you are using speakerphone mode, or return the corded handset to the telephone base.
NOTES:
1.Before the intercom call is answered, you can cancel the intercom call by pressing 
OFF/CLEAR or INT on the calling handset.
2.If the called handset is not answered within 100 seconds, or if it is in the directory or call log mode, or is on a call, or is out of range, the calling handset shows the message UNABLE TO CALL TRY AGAIN.
3.Pressing 
OFF/CLEAR or MUTE/DELETE on a cordless handset, or pressing CLEAR or MUTE on the telephone base temporarily silences the intercom ringer.
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