NEC Electra Elite 48/192 Features And Specifications Manual page 345

Issue 6
F - 2
The Electra Elite 48/192 systems cannot distinguish between an
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incoming facsimile call and a CO/PBX call. Ringing assignments
should be turned off for fax lines.
A facsimile call terminating at the CO/PBX line where the Fax Branch
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Unit is connected in branch is automatically answered by the Fax
machine. Delayed Ringing Line assignment to stations for the Fax
Branch Line are recommended.
When the facsimile is in use, the loop detection information turns on
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the associated CO/PBX line key LED on a Multiline Terminal.
When the facsimile is not in use, the Fax Branch CO/PBX line can be
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used as an outside line.
Code restriction does not apply to outgoing calls from the Fax
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machine.
Facsimile CO Branch Connection
Electra Elite