Telephone operation
Conference call
You can have a conference call with an external line and two registered handsets. When one handset is on the line,
• Press 
/FLASH or 
/SPEAKER on another handset to join the call.
Model DS6121-2
1.Press INT to initiate an intercom call and its screen displays CALLING OTHER HANDSET. The destination handset rings and its screen displays
OTHER HANDSET IS CALLING.
2.After the destination handset has been answered, press and hold INT on the originating handset to let the destination handset join the call.
Models DS6121-3/DS6121-4/DS6121-5/DS6122-5
1.Press INT to initiate an intercom call. The screen displays TRANSFER TO:
2.Use the dialing keys to select the destination handset. The originating handset screen displays CALLING HANDSET X.
3.The destination handset rings and its screen displays HANDSET X IS CALLING.
4.After the destination handset has been answered, press and hold INT on the originating handset to let the destination handset join the call.
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