Ringer: To adjust the ringer volume, press the “+” (plus) or “-“(minus) keys near the bottom of
the phone under the keypad. Your phone will remember the ringer volume setting until the
phone is restarted. Your phone may restart due to power outages or firmware upgrades at any
time. Check your volume settings often to ensure it is at the level you desire.
Handset: To adjust the handset volume, press the “+” (plus) or “-“(minus) keys near the bottom
of the phone under the keypad. This new volume setting will only be valid until you hang up
the phone. The phone will set the handset volume back to the default level (approximately ¾).