Uniden TXC400 Owner's Manual page 27

You must subscribe
through your local
telephone company
to receive Call
Waiting Service.
[ 26 ] B A S I C S
If you have Call Waiting service and a call waiting tone sounds
while you are on a call, press
call. There is a short pause, then you will hear the new caller.
To return to the original caller, press
The voice mail LED on the handset is designed to work with
your voice mail service provided by your local telephone
company. The LED flashes when you have new incoming
messages in the voice mail service.
You may need to occasionally reset the indicator if it remains
On after you've retrieved your messages. To reset the indicator,
when the phone is in the standby mode press and hold
on the base until the paging sound stops (about 5 seconds).
to accept the waiting
TALK/FLASH
again.
TALK/FLASH
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