NEC Electra Elite 48/192 Features And Specifications Manual page 513

Issue 6
S - 8
Restrictions:
A station number cannot be programmed as a Secondary Incoming
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Extension on multiple Flexible Line keys on a Multiline Terminal.
Intercom voice signaling to another station cannot be picked up at
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the Secondary Incoming Extension. The LED on the Secondary
Incoming Extension indicates Idle.
General:
Calls that recall to a station are not indicated by the LED and do not
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ring on a Secondary Incoming Extension.
Tone Override and Camp-On calls to a station are indicated by the
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LED and ring on a Secondary Incoming Extension.
Calls cannot be originated from a Secondary Incoming Extension.
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Off-Hook Ringing is provided with calls ringing into Secondary
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Incoming Extensions.
Secondary Incoming Extensions cannot be set for Call Forward.
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Internal and outside line calls answered from a Secondary Incoming
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Extension become the answering station user call.
Off-Hook indication busy lamp field (BLF) is not provided on the
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Secondary Incoming Extension.
When a Secondary Incoming Extension call is received and
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answered while the user is on an internal or outside line call, the first
call is automatically put on hold.
Electra Elite
Secondary Incoming Extension