Avaya CMC1, Maintenance Procedures

Page: 134 / 426

Server initialization, recovery, and resets
Link Recovery
134 Maintenance Procedures
December 2003
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.
• Calls held in queue for an ACD group, attendant group, call park, or are on hold might be dropped
during Link Recovery.
• The talk path between two or more points remains up, even if one or all of the parties hangs up.
• Music or announcement sources associated with a call remain connected to queued or 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, call
attendants, and other time-related statistical reports.
• If the calling party hangs up during Link Recovery, expect inaccuracies in the CDR records for
the recovery time period.
• Phone buttons (including feature access buttons) do not work.
The Feature interactions and compatibility on page 137 section describes other performance 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 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
Communication Manager.
• The maintenance subsystem begins a context audit after Link Recovery.
Link recovery unsuccessful
Server alarms
Expiration of the Link Loss Delay Timer triggers Communication Manager alarm notification. These
events and their associated alarm levels are in
Table 48, Avaya Communication Manager alarms, on page
134.
Table 48: Avaya Communication Manager alarms
Event Alarm level
Link Loss Delay Timer expires (loss of link to gateway) Minor
Gateway reconnects Clear
Original gateway fails to reconnect Major
Original gateway reconnects Clear