523

CLASS: Visual Message Waiting

Indicator

Contents This section contains information on the following topics:
"Feature description" (page 523)
"Operating parameters" (page 527)
"Feature interactions" (page 528)
"Feature packaging" (page 529)
"Feature implementation" (page 529)
"Feature operation" (page 531)
Feature description
The Custom Local Area Signaling Service (CLASS) Visual Message Waiting
Indicator (VMWI) feature allows a CLASS set to receive a visual indication
that messages are waiting. The visual indicator may be in the form of a
lighting or flashing Light Emitting Diode (LED), or a special message on a
liquid crystal display, or both. The type of visual indicator depends on the
firmware of the CLASS set being used.
For a non-Class set, lighting the Message Waiting Lamp through a high
voltage message (Voltage Message Waiting) is still supported and operates
in the same way as it did before.
The visual indication message (an "ON/OFF" CLASS VMWI specific
message) is delivered from the system to the CLASS sets using Frequency
Shift Keying (FSK) signaling based on Bellcore specifications, using a
CLASS modem (CMOD) unit. The CMOD units are configured using LD 13.
Once configured, the CMOD units are shared throughout a multi-customer
system. When an FSK message is presented to a CLASS set, an available
CMOD unit is automatically allocated.
Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008
Copyright © 1994–2008, Nortel Networks
.