NEC Electra Elite 48/192 Features And Specifications Manual page 453

Issue 6
RELATED FEATURES
LIST
O - 2
General:
Off-Hook Ringing applies only to lines assigned to ring.
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At system default, Off-Hook Ringing tone volume is approximately 10
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dB lower than On-Hook Ringing tone volume.
The Off-Hook Ringing feature is effective when a headset is used.
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Off-Hook Ringing follows the Distinctive Ringing Pattern selection but
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not Synchronous Ringing.
Off-Hook Ringing is provided for calls to a Secondary Incoming
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Extension when the station user is busy on an internal or outside call.
Feature
Number
D-15
Feature Name
Do Not Disturb (DND)
Electra Elite
Off-Hook Ringing