VTech DS3111-3 - Manual (Page 25)

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Switch between external and internal calls
When on an external call and you wish to make an intercom call to another system
handset without ending the external call:
During an external call, press INT to initiate the intercom feature.
The originating handset screen displays TRANSFER TO:
Dial the number associated with the handset you are trying to intercom.
The originating handset screen displays
CALLING HANDSET X. The destination
handset rings and displays HANDSET X IS CALLING.
Press /FLASH, , INT or any dialing keys (0-9, #, *) on the destination
handset to answer the internal call.
Press
INT on the originating handset to switch between the external call (outside)
and intercom call.
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Basic operation