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LAN
Local Area Network

LCD
Liquid Crystal Display. A display panel found on many phones capable of showing text prompts or messages

LCR
Least Cost Routing. A technique where the telephone system modifies the digits dialled by a user making an outside call in order to route the call via a low-cost carrier. Typically the routing decision is based on what number has been dialled and it is often possible to have several carriers configured on the same telephone system to take advantage of the cheapest rout to any destination. See also Automatic Route Selection (ARS). Typically ARS incorporates and builds on the capabilities of LCR

LED
Light Emitting Diode. A semi-conductor device used as an indicator lamp. Typically these are incorporated into buttons and show red or green.

Live Call Screening
A facility available on some voicemail systems which allows someone who has diverted his calls to voicemail to listen to a caller leaving a message and pick up the call if he wants to.

Loud Ringing Bell
An audio warning device to alert someone that a call is ringing. It may simply be an extension bell to a telephone or it could be a set of bells around the building so that anyone can pick up the incoming call.

Mailbox
A reference to the location where voicemail messages for a particular user are stored.

MAPI
Message Application Progamming Interface - A messaging architecture and a client interface component for applications such as e-mail, scheduling, calendaring, and document management. As a messaging architecture, MAPI provides a consistent interface for multiple applications programs to interact with multiple messaging systems across a variety of hardware platforms.

MSN
Digital ISDN Dial-In number.

Multiplexer (Mux)
Multiplexers combine several data channels into one channel with bigger bandwidth. The signal is split into the original channels at the other end of the line.

Music on Hold
Most systems offer some sort of music which plays to callers while they are holding for a busy extension. It aims to reassure the caller that they are still connected, rather than lost in the system. Many systems allow independent music sources such as tapes and CDs to be attatched to the system. This is called 'user-defined music on hold'.

Night Service
Most telephone systems have at least two operating modes, Day service and Night Service. These are typically used to route incoming calls to a different destination and to apply call barring to prevent unauthorised use of the phones by security or cleaning staff.

Operator Consoles
Operator Consoles are the central answering points on PBX systems. They give at-a-glance information about the stauts of lines and extensions. They also give information about features which have been activated and should show which calls are on hold and how long they have been waiting. Some are low-level units attatched to a phone, usually with some form of display. More sophisticated consoles come with a full-size moitor display which provides system status information.