Avaya 1220 User Manual page 316

Terms you should know
Multiple Appearance Directory Number (MADN)
When multiple phones are configured with a MADN Single Call
Appearance (SCA), they appear as a single Directory Number
(DN).
Mute
This is a fixed key used to listen to a call without transmitting.
Navigation keys
These are keys used to scroll through menus and lists that
appear on the LCD display screen.
Off-Hook
The term off-hook is applied when (a) the end user lifts up the
handset, (b) the end user presses a line key, (c) the call is
automatically answered at the telephone, or (d) a line is
automatically selected for an outgoing call.
Parked Call
This is an active call you park on the server or to another user
that can be retrieved from another phone.
Presence
This is a feature that you can use to set a presence state to be
displayed to other users.
Quit key
This is a fixed key you use to exit an active menu.
Ringback/ring tone
This is a sound indicating that a call you make is ringing at its
destination.
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