AT&T 2440 - Manual (Page 13)

The base unit of this cordless phone is a full-featured speakerphone.
TELEPHONE OPERATION
AT THE BASE
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Flashes when you have
new voice mail messages.
(You must subscribe to
service from your local
telephone company.)
Light within button:
Flashes when
call is on hold.
On steadily when base
speakerphone is in use.
Volume
Adjust speakerphone
volume during a call.
Mute
Press to prevent the
other person from
hearing you (you will
still be able to hear the
other person). The
MUTE light goes on.
Press again to return to
your conversation.
Flash/Call Waiting
Access telephone
company subscriber
services during a call.
Make, Answer,
or End a Call
Press
K.