NEC Electra Elite 48/192 Features And Specifications Manual page 134

Electra Elite
Features and Specifications Manual
Callback Requests are protected by system memory battery backup.
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When a Callback Request is set, the caller receives a set tone.
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A caller does not receive a set tone when attempting to leave a
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Callback Request at a station with three Callback Requests set.
Callback Requests that are set in the system can be canceled
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(system-wide) only at Attendant Positions.
Individual Callback Requests are canceled when:
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1. Callback recipient places internal call to Callback originator.
2. Callback originator places internal call to Callback recipient.
3. Callback recipient enters Feature, 99, Feature.
A Callback Request can be set to a Single Line Telephone (SLT), but
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there is no indication at the SLT. The SLT user can still go Off-hook
and dial # to complete the callback.
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