Cisco 8832 User Manual page 54

Change the Ringtone, page 43
Adjust the Phone Ringer Volume, page 43
Adjust the Volume During a Call, page 44
You can change the sound that your phone uses for incoming calls.
Select Settings > Preferences > Ringtone.
Scroll through the list of ringtones and press Play to hear a sample.
Press Set to use the ringtone.
If your phone ringer is too loud or too soft when you get an incoming call, you can change the ringer volume.
Changes to the ringer volume do not affect the call volume you hear when you are on a call.
Press Volume up or down to adjust the volume when the phone is not in use.