Nortel 1000 Features And Services Fundamentals page 527

Operating parameters
This feature has been developed for the North American residential market,
as well as for the small business, hospitality, schools and universities,
nursing homes and hospitals, and mobile home markets.
When a craftsperson uses LD 10 to administer a service change to a
CLASS set, if the system software identifies, during overlay wrap-up, that
the CLASS VMWI feature is waiting to send a visual indication to the set
being serviced, a SCH1099 message is generated, indicating that the VMWI
pending message is lost and no retry is attempted. The service change
itself does not trigger any messages to the set.
Some CLASS sets, like Nortel's M9000 series of sets, support both voltage
and CLASS (FSK) Message Waiting. However, once the CLASS set is
configured in LD 10, then the system will no longer send voltage messages
to the set.
If a CLASS set that previously used FSK messaging to receive Visual
Message Waiting Indication has the Class of Service changed to be a
non-CLASS set that uses Voltage Message Waiting, the visual indicator will
not operate correctly. The following will occur:
•
•
It is up to the craftsperson to ensure that a CLASS set is correctly configured
to support the CLASS VMWI feature.
Up to 255 CMOD units may be configured on a system. Once configured,
the CMOD units are shared throughout a multi-customer system. When
an FSK message is transmitted to a CLASS set, an available CMOD unit
is automatically allocated.
If a CLASS set with a lit message waiting indicator retrieves all of its
messages, 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.
Lamp audit does not apply to the CLASS VMWI feature.
There is a 2 1/2 hours time limit for a retry in the case of a pending message.
Up to 255 CLASS modem units can be configured on a system, and up
to 32 CLASS modem units can be configured on any Extended CLASS
Modem card.
Copyright © 1994–2008, Nortel Networks
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Voltage Message Waiting will work if the set is returned to the no
message waiting state (visual indicator is dark) before switching over
from FSK to voltage.
Voltage message waiting will not work if the set is left at the message
waiting state (visual indicator is lit) before switching from FSK to voltage.
Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008
Operating parameters 527