NEC Electra Elite 48/192 Features And Specifications Manual page 107

Issue 6
SERVICE
CONDITIONS
B - 4
Data Assignment:
Use Memory Block 1-1-79 (BGM Port Assignment) to assign a loop
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start COI port as the station BGM port.
General:
Background Music stops while the Multiline Terminal is in use.
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When Background Music is provided via a COI port, a Valcom
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V-9941A (or equivalent) is required to provide Talk Battery to the
COI(8)-U10 ETU.
BGM stops at a station that is in DND mode while receiving an
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incoming call indication.
Originating a call, answering a voice announcement, a ringing call,
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paging, or pressing the Feature key interrupts Background Music.
Background Music - Multiline Speaker
Electra Elite