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The selected volume setting is applied immediately
and is also used for future calls. A separate setting
is used for when volume booster is on and when it is
off.
Available volume settings
The available settings vary by model and whether
volume booster is turned on or off.
BOOST
indicator
Volume
booster
Available volume
settings
Default
Light off
Turned off Receiver: 1–15
15
Speakerphone: 1–21 15
Headset: 1–15
15
Light in
red
Turned on KX-TGM420 series
Receiver: 12–40
15
Speakerphone: 18–30 21
Headset: 12–40
15
KX-TGM450 series
Receiver: 12–50
15
Speakerphone: 18–40 21
Headset: 12–50
15