AT&T ML17928 Quick Start Manual page 7

Quick reference guide
VOL +
When the telephone is idle, press
to increase the ringer volume for
both lines.
During a call, press to increase the
listening volume.
When a line is ringing, press to
increase the ringer volume of that
line temporarily.
VOL -
While the telephone is not in
use, press to decrease the ringer
volume for both lines.
During a call, press to decrease
the listening volume.
When a line is ringing, press to
decrease the ringer volume of that
line temporarily.
HEADSET
Press to activate the headset
when a corded headset is
connected.
MUTE
During a call, press to mute the
microphone.
Speed dial keys
Press to dial or review a stored
speed dial number when the
telephone is idle.
SPEAKER
Press to turn the
base speakerphone
on or off.
LOwER
Press to enter the lower
locations of the speed dial
keys.