Avaya G250 Maintenance Manual page 70

Avaya Communication Manager controlled maintenance
Call handling during recovery
While the H.248 link is down, calls that were already in progress before the link failure remain
connected during the recovery process. Once the link is re-established, normal call processing
continues. If the gateway successfully reconnects, the actual outage is less than 2 seconds.
Should the link failure persist for a few minutes, some features or capabilities are affected:
New calls are not processed.
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Calls held in queue for an attendant group, call park, or calls on hold might be dropped
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during Link Recovery.
The talk path between two or more points remains up, even if one or all of the parties
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hangs up.
Music or announcement sources associated with a call remain connected to queued or
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held calls in progress, even if one or all parties to the call hangs up.
If the link failure continues for several minutes, expect inaccuracies in the BCMS, CMS,
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call attendants, and other time-related statistical reports.
If the calling party hangs up during Link Recovery, expect inaccuracies in the CDR records
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for the recovery time period. During a failure condition, the original MGC marks calls as
being torn down after the Link Loss Delay Timer has expired, and updates CDR records
that the calls are completed. The MGC does not update CDR records for the reconstructed
calls.
Phone buttons (including feature access buttons) do not work.
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Links to a voice response system are not preserved in a failover situation.
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Applications running on the Avaya Communication Manager API server connect with
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Avaya Communication Manager through an IP softphone-like interface. Thus, an individual
instance of an application might end up in Connection Preservation mode, where no Avaya
Communication Manager features other than disconnects are allowed.
The Feature interactions and compatibility
impacts associated with Link Recovery.
Maintenance during recovery
During Link Recovery the following maintenance events occur:
If a media module change occurs during the link failure but before the expiration of the
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Total Search Time, the gateway informs the controller of the change after the link is
re-established.
Any media modules that were reset, removed, or replaced are removed and inserted in
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Avaya Communication Manager.
The maintenance subsystem begins a context audit after Link Recovery.
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70 Maintenance for the Avaya G250 and Avaya G350 Media Gateways
on page 78 section describes other performance