3Com NBX, Руководство пользователя

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Using Automatic Callback 67
for a call back. The range for this timer is 1 minute to 24 hours with
the default being
12 hours . If the Callback is not received within this
time, the system cancels the Callback.
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An extension can have up to five Automatic Callback requests
assigned to it. Return call backs are generated in the order that they
were received (FIFO).
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Events that generate a call back from the destination extension
include:
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Entering a feature code followed by an on-hook event
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Invoking Directory followed by an on-hook event
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Going off-hook then on-hook
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Using F 111 to terminate a session
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You cannot initiate an Automatic Callback to:
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An external number
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An ACD extension
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A Hunt Group extension
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A TAPI RoutePoint extension
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A Call Park extension
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An extension receiving a transferred call
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A Phantom extension
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You cannot initiate Automatic Callback to a device connected to an
Auto Attendant or Voicemail.
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If Call Forward All or Do Not Disturb is enabled on the Automatic
Callback destination extension, the message “Not Allowed” is
displayed at the telephone attempting to initiate the Automatic
Callback.