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Multiple handset use
Intercom
Use the intercom feature for conversations between two devices.
You can buy additional expansion handsets (AT&T model DL70019, sold 
separately), cordless headsets and speakerphones for this telephone system. 
Youcanregisteruptovehandsetsorcordlessheadsets/speakerphonesto
the telephone base.
To initiate an intercom call:
1.  Press MENU/SELECT on the handset in idle mode.
2.  Press  CID or  DIR to highlight Intercom, then press MENU/SELECT .
3.  The screen displays Intercom to:. Use the dialing keys to enter a device 
number (1-5). The handset shows Calling HS X. The destination handset 
rings and shows HS X is calling.
To answer an intercom call:
 Press  HOME/FLASH,  /CELL,  /SPEAKER, or any dialing key  
(0-9, TONE   or QUIET#) on the handset
. Both handsets now show Intercom.
To end an intercom call:
 Press 
 
OFF/CANCEL or place the handset back in the telephone  
base or charger.
Note: For cordless headsets and speakerphones, refer to the corresponding user’s manual on how to answer and 
end an intercom call.