Function buttons allow you to use a headset, speakerphone, enable mute, and adjust volume settings.
To use the headset button:
All phones have speaker capabilities. If you begin your call with your handset, you can move to the headset or speakerphone by pressing the Headset or Speakerphone button, and then return the handset to the cradle. To move a call from headset to speakerphone to the handset, lift the handset.
To use the Speakerphone button:
Microphones are very sensitive. We recommend you mute your phone while on conference calls or if you need to speak to others around you. When you mute your phone, you will continue to hear people on the call, but they will not hear you.
To use the mute button:
Adjust volume levels by pressing + or – on the volume control button. When you increase or decrease the volume, it remains at that setting until you change it again (or until your phone reboots). If your phone reboots, all volume settings return to their default levels.
Use the volumn control button to control volume levels for: