Avaya 3641 User Manual page 28

If you want to Then
Display additional During a call, press to display
FCN
additional features that have been
features
customized for your facility.
Turn on the backlight The backlight comes on when any key is
pressed or when there is an incoming call and
stays on for 10 seconds. It turns off after 10
seconds if another key is not pressed within
that period.
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