AT&T EL51210 Quick Setup Guide

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You can make an intercom call between handsets.

Press 

INT on your handset when not in use. Your screen shows 

CALLING HANDSET X. The other handset rings and its screen 
shows 

HANDSET X IS CALLING.

To answer the intercom call, press 

,  

SPEAKER or INT on that handset. Both handsets now show INTERCOM.

To end an intercom call, press 

, or place the handset back in the 

telephone base or charger.

NOTE: Before the intercom call is answered, you can cancel the intercom call by pressing 

 or 

INT on your originating handset.

You can transfer an outside call to another system handset.

During a call, press 

INT and proceed just as you would for a normal intercom call. Once 

the other party has answered the intercom call, you have the following options:

You can let the other handset join you on the outside call in a three-way 
conversation. Press and hold 

INT on the calling handset.

You can transfer the call. Press 

, or place your handset back in the 

telephone base or charger. Your handset screen shows 

CALL TRANSFERRED. The 

other handset automatically connects to the outside call.
You can switch between the outside call (

OUTSIDE CALL appears on the screen) and the 

intercom call (

INTERCOM appears on the screen). Press INT on your handset to switch.

The other person can end the intercom call by pressing 

, or by placing 

the other handset back in the telephone base or charger. The outside call continues 
with the original system handset.

To cancel the transfer and return to the external call before the intercom call is 
answered, press 

, 

 or 

INT on your handset.

If the other handset is not answered within 100 seconds, or if it is in use, on a call, or 
out of range, the calling handset shows 

UNABLE TO CALL TRY AGAIN on its screen and 

automatically returns to the external call.

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