Cisco Unified IP Phone 7931G User Guide for Cisco Unified Communications Manager 9.0 (SCCP and SIP)
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You can customize how your phone indicates an incoming call and
a new voice mail message. You can also adjust the ringer volume for your phone.
Contact your system administrator about minimum ringer-volume settings.
You can adjust the characteristics of the phone screen.
If you change the brightness setting on your phone, do not
unplug the phone from its power source for at least one minute, or the
brightness setting will not get saved.
Contact your system administrator about this optional feature availability. This feature allows you to turn off the backlight for a predetermined time (as set by your system administrator).