AT&T Speakerphone with Caller ID with Call Waiting 959 - Manual (Page 20)

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TELEPHONE OPERA
TION
TELEPHONE OPERA
TION
Mute
Press M to prevent the other party from hearing you
(you will still be able to hear the other party). Press
M again to return to two-way conversation.
Ringer Volume
Use the RINGER switch on the side of the base to adjust
the ringer volume to OFF, LOW or HIGH. If you set
the RINGER switch to OFF, this phone will not ring when
you have an incoming call.
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