524 CLASS: Visual Message Waiting Indicator
After all messages are retrieved, the visual indicator is cleared. The CLASS
VMWI feature will not be able to turn off the message waiting indicator
until the CLASS set has returned to the idle state, even though all of the
messages have been retrieved by the user.
The CLASS VMWI feature supports the Bellcore Single Data Message
Format (SDMF) and Multiple Data Message Format (MDMF) messaging.
These formats are configured in the system database using LD 10. To use
SDMF, a Class of Service of CNUS is required. For MDMF, a Class of
Service of CNUA and/or CNAA is required.
The following description outlines the general functionality of the CLASS
VMWI feature.
The following scenarios affect the sending of an ON or OFF message
indicator to a CLASS set.
If the CLASS set is idle:
•the ON/OFF message is sent immediately to the set.
If the CLASS set is busy:
•as soon as the CLASS set becomes idle (goes on-hook), the system
immediately sends the VMWI message to the set.
If the CLASS set or CMOD unit is disabled (using LD 32 or 30), or no
CMOD unit is available:
•the CLASS VMWI feature will automatically abort the VMWI message.
The CLASS set is then checked every 10 seconds, for up to 2 1/2
hours, until the set is detected to be idle. At that time, the system will
immediately deliver the VMWI message.
If a CLASS set is in the middle of receiving a VMWI message, and the
CLASS set goes off-hook:
•the VMWI message is aborted. The CLASS set is checked every 10
seconds, for up to 2 1/2 hours, until the set is detected to be idle. At that
time, the system will immediately deliver the VMWI message.
Note that, if the CLASS VMWI feature is waiting to send an "ON/OFF"
message and another "ON/OFF" message is requested, only the last
"ON/OFF" message is actually sent to the CLASS set.
The CLASS VMWI feature supports Nortel and third party CLASS sets, if
these sets are Bellcore VWMI compliant.
The following figures depict a typical feature operation and system resource
allocation scenario for a CLASS Visual Message Waiting Indication being
presented to a CLASS set. Note that the representation is for an ON
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
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