Nortel Networks 1165E - Manual (Page 49)

Terms you should know
49
Waiting, All Lines Forwarded to: 6453, Do Not Disturb On, Ring
Again active, and Ringer is OFF.
System or Switch
Your office communication system.
Switchhook
A button on which the handset presses down, disconnecting your
call when you replace the handset. The handset (when lifted)
releases the switchhook, and you either answer an incoming call
or you receive a dial tone to make a call.
User interface
Screen displays that interact with the end user as a result of an
action or event.
Visual Alerter/Message Waiting indicator
An LCD or an LED that flashes to indicate that a message is
waiting or when the ringer is on.