NEC Electra Elite 48/192 Features And Specifications Manual page 45

Issue 6
SERVICE
CONDITIONS
A - 24
Data Assignment:
Use Memory Block 4-51 (Off-Hook Ringing Selection) to assign YS
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(default) or NO for Off-hook ringing for Answer Hold to work.
Restrictions:
Answer Hold does not function for incoming internal calls.
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CO/PBX incoming calls not assigned to ring or assigned to other
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tenants do not activate Answer Hold.
DID/Tie line and DIT/ANA calls do not activate Answer Hold.
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When all Call Appearance keys are in use, the next call cannot be
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answered.
General:
CO/PBX ringing transfer/camp-on calls may be answered.
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When multiple incoming calls activate the Answer key LED, the LED
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continues to flash until all calls are answered.
Electra Elite
Answer Hold