Avaya Communication Manager Administrator's Manual page 538

Managing Data Calls
Administered Connections failure: Auto
Restoration and Fast Retry
When an active AC drops prematurely, you must invoke either auto restoration or fast retry to
determine whether auto restoration is attempted for an active AC.
If you option AC for auto restoration and the connection was routed over SDDN trunks, auto
restoration is attempted. During restoration, connections are maintained between the server
and both endpoints. In addition to allowing the active session to be maintained, AC also
provides a high level of security by prohibiting other connections from intervening in active
sessions. Auto restoration generally completes before the 60-second endpoint holdover
interval. If auto restoration is successful, the call might be maintained (no guarantee). The
restoration is transparent to the user with the exception of a temporary disruption of service
while restoration is in progress. A successful restoration is reflected by the restored state on the
status AC screen. Although the restoration was successful, the data session might not have
been preserved.
If auto restoration is not active or if the AC is not routed over SDDN trunks, Communication
Manager immediately attempts to reestablish the connection (fast retry). Communication
Manager also attempts a retry if the originating endpoint initiated the drop. With fast retry,
connections are not maintained on both ends. Fast Retry is not attempted for an AC that was
last established via fast retry, unless the AC is active for at least two minutes.
If auto restoration or fast retry fails to restore or reestablish the connection, the call drops and
the AC goes into retry mode. Retry attempts continue, at the administered retry interval, as long
as the AC is due to be active.
Administering Administered Connections
To administer administered connections:
1. Choose one of the following data modules and administer all fields:
Data Line Data Module (use with Data Line circuit pack)
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Processor/Trunk Data Module (use with one of the following:)
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MPDMs, 700D, 7400B, 7400D, or 8400B
MTDMs, 700B, 700C, 700E, or 7400A
Processor Interface Data Module (for more information, see Administration for Network
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Connectivity for Avaya Communication Manager, 555-233-504)
X.25 Data Module (for more information, see Administration for Network Connectivity for
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Avaya Communication Manager, 555-233-504)
7500 Data Module (use with ISDN Line 12-BRI-S-NT or ISDN Line 12-BRI-U-NT circuit
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pack)
World Class Core BRI Data Module (use with wcbri)
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538 Administrator Guide for Avaya Communication Manager