Try pressing the intercom button (base) above the number 1, on the handset the intercom button is below the # button.
Intercom?
Whenever the phone is in standby, you can make an intercom call
between stations without using the phone line.
?
You can make an intercom call from any station, but only two stations
can be in an intercom call at any time.
?
If an outside call comes in during an intercom page, the phone cancels
the page so you can answer the incoming call.
?f an outside call comes in during an intercom page, the phone cancels the page so you can answer the incoming call.
?
If an outside call comes in during an intercom call, press
speaker on the base or talk/flash on the handset to hang up the intercom call and
answer the outside call
see page 15/16 of the manual at the link below.
http://www.uniden.com/pdf/D1688-2om.pdf
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