3Com 3C10402B Administrator's Manual page 73

An assistant may initiate only two WhisperPage sessions at any one
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time (one or both on hold), provided that there is a line available for
each session.
While using WhisperPage, if the party speaking to the manager hangs
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up and terminates the call, the system disconnects the assistant from
the call.
The system displays an error message to the assistant on the display
panel and plays a feature error tone.
The assistant and the manager must be on the same system.
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You cannot use the WhisperPage feature over VTL /Q.SIG/ T1 tie lines
or /PRI / BRI/ T1 E&M robbed bit lines.
The system has a resource pool of 42 multicast addresses for the
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WhisperPage feature.
There are no limits as to the maximum number of multicast addresses
that any one feature can use. It is possible for another feature to
exhaust the addresses in the resource pool.
Use the DND feature to implement Decline Whisper.
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On an ATA, any feature that the manager tries to invoke disconnects
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the assistant from the call.
If the manager presses flash hook on an ATA to enter a feature code,
the system invokes hold on the manager's device.
On an ATA, a telephone user cannot distinguish the difference
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between Supervisory Monitoring Whisper Mode and WhisperPage.
There is no display panel on an ATA, and the tone is identical for both
features.
For more information about configuring WhisperPage, see the online
Help.
WhisperPage 73