Telephone operation
Models DS6121-3/DS6121-4/DS6121-5/DS6122-5
1.During a call, press INT to put the call on hold at the originating handset. The screen displays TRANSFER TO:
2.Use the dialing keys to enter the destination handset number. The originating handset screen displays CALLING HANDSET X.
3.The destination handset will ring and its screen will display HANDSET X IS CALLING.
4.To answer the call at the destination handset, press 
/FLASH, 
/SPEAKER, INT or any dialing keys
5.Now the party at the originating handset can have a conversation with the party at the destination handset. Both screens display INTERCOM.
6.Press INT repeatedly on the originating handset to alternate between the external call (outside call) and the intercom call.
Answer an incoming call during an intercom call
During an intercom call, there will be an alert tone signaling an incoming call.
•To answer the incoming call, press 
/FLASH and the intercom call will end automatically.
•To terminate the intercom call without answering the incoming call, press OFF/CLEAR on the handset.
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