Cisco Unified IP Phones 7906G and 7911G 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 message. You can also adjust the ringer volume for your phone.
Before you can access this setting, your system administrator might need to enable it for you.
Contact your system administrator about minimum ringer-volume settings.
You can adjust the characteristics of the phone screen.