Panasonic 2001 - Manual (Page 77)

Terms you should know
77
Message waiting indicator/Incoming call indicator
An LCD or an LED that indicates the status of a feature by the
flash, wink, steady on, or off.
Navigation keys
Keys used to scroll through menus and lists appearing on the
LCD display screen.
Off-hook
Any line selected to make a call or receive an incoming call.
The term
off-hook is applied whether (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.
Paging tone
A special tone heard when using the Radio Paging feature. You
hear two beeps followed by dial tone.
Ringback/ring tone
A sound indicating that a call you have made is ringing at its
destination.
Services key
A fixed key used to access options such as Telephone Options,
Password Admin, Virtual Office Login, Virtual Office Logout, Test
Local Mode, and Resume Normal Mode.
Shared Directory Number
A DN (extension) that is shared by two or more persons.
Special Prefix code (SPRE)
Special codes entered using the dialpad, followed by a two-digit
access code, that enable features (for example, Call Forward All
Calls requires entry of SPRE code + 74).