Nortel Meridian 1 option 11C Planning And Installation Manual page 237

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Off-premise 500/2500-type telephones must be connected through an
NTAK92AA Off-Premise Protection module. Each module can connect up to
four analog telephones and can interface with an NT1R20 Off-Premise
Station analog Line Card or with an NT8D09 Message Waiting Line Card.
The message waiting line card produces -150 volts which is
considered hazardous on off-premise telephones. Make sure that the
-150 V is disabled on off-premise telephones.
The voltage is disabled when the Class Of Service (CLS) assigned to
the telephone is LPD (message waiting lamp denied) and MWD
(Message Waiting Denied) in LD 10.
Refer to the X11 Software guides for information about LD 10.
Under no circumstances shall LPA or MWA be assigned in the Class
of Service on off-premise telephones.
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If connecting to a message waiting line card, unseat the card from its
assigned slot before proceeding with the next step.
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