Cisco SPA 500 Series Quick Reference Manual page 3

Barracuda Phone System
Ringer and Handset Volume
To change the ringer volume when the phone is idle, press the volume up and volume down
buttons at the right side of the keypad.
To change the volume of the handset or speakerphone, during an active call, press the volume
up and volume down buttons.
To toggle mute on and off, during an active call, press the red mute button.
Cisco SPA 500 Series Quick Reference Guide 3 / 4