Terms you should know133Waiting, All Lines Forwarded to: 6453, Do Not Disturb On, RingAgain active, Ringer is OFF, and Line x Unavailable.System or SwitchYour office communication system.SwitchhookA button that the handset presses down, disconnecting your callwhen you replace the handset. The handset (when lifted)releases the switchhook and you either answer an incoming callor you receive a dial tone to make a call.User InterfaceScreen displays that interact with the end-user as a result of anaction or event.Volume control barA rocker bar you press to increase or decrease the volume of theringer, handset, headset, speaker and the Handsfree feature.
