Panasonic KX-FB421 - Manual (Page 27)

Volume
27
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Volume Adjusting volume
Ringer volume
4 levels (high/middle/low/off) are available.
While the unit is idle, press {{{{+
+ + +}}}} or {{{{- - - -}}}}.
To turn the ringer off
1. Press {{{{- - - -}}}} repeatedly until the following is
displayed.
RINGER OFF= OK?
YES:SET/NO:STOP
2. Press {{{{SET}}}}.
RINGER OFF
L To turn the ringer back on, press {{{{+ + + +}}}}.
While the ringer volume is set to off
When a call is received, the unit will not ring and
will display the following.
INCOMING CALL
Ringer pattern
You can select the ringer pattern (feature #17 on
page 60). The ringer pattern you selected will
sound when the unit receives a call.
Handset receiver volume
5 levels (high to low) are available.
While using the handset, press {{{{+
+ + +}}}} or {{{{- - - -}}}}.
Monitor volume
8 levels (high to low) are available.
While using the monitor, press {{{{+
+ + +}}}} or {{{{- - - -}}}}.
{SET} {+} {-}