System information

Glossary
GL-22 Issue 1 October 1997
NT
Networking application identifer. See application identifer.
MWL
See message waiting lamp (MWL).
numbering plan area
Formal name for 3-digit telephone area codes in North America. Within an area code, no two tele-
phone lines may have the same 7-digit phone number. The code is often designated as NXX , to
indicate the three digits.
O
off-hook
See switch hook.
on-hook
See switch hook.
on-line help
A Lucent I
NTUITY system feature that provides information about user interface windows, screens,
and menus by pressing a predetermined key. See also help.
open systems interconnection (OSI)
An internationally accepted framework of standards for communication between systems made
by different vendors.
operating system (OS)
The set of software programs that runs the hardware and interprets software commands.
option
A choice selected from a menu, or an argument used in a command line to specify program out-
put by modifying the execution of a command. When you do not specify any options, the com-
mand executes according to its default options.
OS
See operating system (OS).
OSI
See open systems interconnection (OSI).
outcalling
A Lucent I
NTUITY system feature that allows the system to dial users’ numbers to inform them they
have new messages.
outgoing mailbox
A storage area on the Lucent I
NTUITY system where users can keep copies of messages for future
reference or action.