NEC Electra Elite 48/192 Features And Specifications Manual page 77

Issue 6
A - 56
Restrictions:
Only one Automatic Callback may be set at a station.
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Automatic Callback cannot be set to a station that is in Do Not
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Disturb mode.
Call Pickup Group feature does not pickup Automatic Callback
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ringing on the originator station.
General:
Any station can be used for setting an Automatic Callback, and
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Automatic Callback can be set to multiple stations regardless of
tenants.
When the user that sets an Automatic Callback receives the Callback
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and does not answer within 30 seconds after the ringing begins, the
Callback is automatically released.
While set, a Callback cannot be manually canceled.
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Electra Elite
Automatic Callback