NEC Electra Elite 48/192 Features And Specifications Manual page 387

Issue 6
I - 4
General:
Each CO/PBX trunk can have a name (13 character-maximum,
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including spaces) or number assigned.
This display function is valid for general incoming CO/PBX calls.
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A maximum of 13 digits or characters can be displayed.
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When a Caller ID CO call is terminated to a trunk assigned trunk
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name/number, the trunk name/number is displayed. In this case, the
Caller ID data is not stored.
When an ACD/SCD/UCD call is received, the trunk name/number is
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displayed when assigned. The Electra Elite 48 system does not
support ACD.
Incoming Trunk Name or Number Display
Electra Elite