Nortel 1000 Features And Services Fundamentals page 528

528 CLASS: Visual Message Waiting Indicator
Feature interactions
Attendant Console
When a CLASS set that is on a call with the attendant goes on-hook, the
call will not be released until the attendant releases the call. The CLASS
VMWI feature will wait until the call is actually disconnected before sending
the VMWI message to the CLASS set that had already gone on-hook
Call Party Control Incoming
When a CLASS set on an active call is placed in Call Party Control Incoming
(CPCI) state, the set will not be presented with any other incoming call. The
CLASS VMWI feature will not send the VMWI message to the CLASS set to
turn the visual indication ON or OFF, until the set releases the active call.
Make Set Busy
When a CLASS set is in the Make Set Busy state, the set will not be
presented with incoming calls. Although no incoming calls are presented to
the set, VMWI message can still be sent to the CLASS set to turn the visual
indication ON or OFF, as long as the set is in the idle and on-hook state.
Meridian Mail
The CLASS VMWI feature makes use of Meridian Mail by having the
Meridian Mail functionality communicate with the system to inform the
CLASS set to turn the visual message waiting indicator ON or OFF. The
system software determines the appropriate type of protocol based on the
configuration of the CLASS set, and sends it to the set to turn the visual
message waiting indicator ON or OFF.
Message Waiting
In order to support the CLASS VMWI functionality on a CLASS set, the
Message Waiting feature has been enhanced to turn the message waiting
indicator ON or OFF on the CLASS set through FSK signalling.
In addition, the CLASS VMWI feature can interwork with Stuttered Dial Tone.
The Stuttered Dial Tone functionality (which is part of the Flexible Tones
and Cadences feature) provides an audible indication, rather than a visual
one, that a message is waiting. It is configured separately from the CLASS
VMWI feature, using the Class of Service (CLS) prompt in LD 10. If the LPA
(Lamp Allowed) response is entered, then a CLASS visual indication is sent.
If the LPD (Lamp Denied) response is entered, then Stuttered Dial Tone is
sent instead. Note that the Stuttered Dial Tone and CLASS visual indication
are mutually exclusive. A CLASS set may receive either Visual or Stuttered
Dial Tone as a message waiting indicator, but not both.
Copyright © 1994–2008, Nortel Networks
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Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008