AT&T 7406 Plus User Manual page 31

Note: In order for the
other party to hear
you, you must speak
through the handset.
To mute the
microphone associated
with the handset so the
other party cannot hear
you
To activate the speaker
while using the handset
To turn off speaker and
return to handset
To end a call (while
handset is on-hook and
only speaker is active)
If you have a display, it shows
[ SPEAKER L >>>> H ]
volume settings. On the display, 1 arrow is the
lowest setting, and 8 arrows is the highest setting)
1 Press
 Mute 
Red light goes on and other party cannot hear you
Press again to resume talking to the other party
 Mute 
through handset
Red light goes off and other party can hear you again
1 Press
 Speaker-Reset Spkr 
Green light next to
go on steadily
 Mute 
The speaker is active and the handset is turned off
1 Pick up the handset
1 Press
 Speaker-Reset Spkr 
Green light next to
go off
 Mute 
(There are 8 possible
and the red light next to
 Speaker 
and red light next to
 Speaker-Reset Spkr 
28