NEC Electra Elite 48/192 Features And Specifications Manual page 619

Issue 6
U - 20
Restrictions:
User can join only one Unsupervised Conference at a time.
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The Unsupervised Conference feature is available only on Multiline
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Terminals.
Only 16 conference calls (Add-On and Unsupervised) may be in
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progress at the same time.
Other stations cannot enter an Unsupervised Conference.
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General:
Other stations cannot be interrupted (Barge-In) while on an
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Unsupervised Conference call.
When the Tandem Transfer Automatic Disconnect Time expires, the
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system automatically disconnects outside calls.
An alert tone is heard one minute before the Tandem Transfer
Automatic Disconnect Time disconnects the outside caller.
ICM hold, Live Record, and Voice Over cannot be used during an
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Unsupervised Conference.
When the CO provides disconnect when one outside party hangs up,
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the other outside party is disconnected.
Electra Elite
Unsupervised Conference