Volume Control Use to adjust the speaker, handset, headset, or ringer volume, depending on which item is in use. Depending on the device you are using at the time, when you press the Volume Control button the display increases or decreases to visually indicate the volume level as follows:
- Increase/decrease Ringer volume
- Increase/decrease Handset volume
- Increase/decrease Speakerphone volume
- Increase/decrease Headset volume