VTech DS6121-5 - Manual (Page 23)

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Telephone operation
Switch between external and intercom call
If you are on an external call and you wish to intercom another handset without
disconnecting the external call:
Model DS6121-2
During a call, press INT to put the call on hold at the originating handset. Its
screen displays CALLING OTHER HANDSET.
The destination handset will ring and its screen will display OTHER HANDSET
IS CALLING.
To answer the call at the destination handset, press
/FLASH, /SPEAKER,
INT or any dialing keys (0-9, #, *) on the destination handset.
Now the party at the originating handset can have a conversation with the party
at the destination handset. Both screens display INTERCOM.
Press INT repeatedly on the originating handset to alternate between the
external call (outside call) and the intercom call.
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