Avaya 9608 Administrator's Manual page 152

System Failover and Survivability
With SIP software Release 2.6 and later releases for failover to secondary controller for
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alternate registration, the user can access Contacts, the Call Forward button, Call Log,
standard Avaya menu or Home Screen applications if administered. The user cannot
make calls in these applications.
Certain softkeys do not display and their related functions are unavailable.
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Call appearance information does not display while dialing, but does appear when Call is
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pressed.
Call connection may take longer than usual.
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Upon failover, any active conference calls, call transfers, and held calls will be dropped.
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Emergency calls may or may not work, depending on the stage of failover and the
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functionality available on the alternate server.
Bridged call appearances are not available. Despite a "Log Bridged Calls" option setting of
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yes, bridged calls are not logged during failover.
During the transition stage, incoming calls may not be received and may go to voice mail.
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Call forwarding may not be available unless the extension to which calls are being
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forwarded is on the same server as the forwarding extension.
The Message Waiting Indicator is cleared, but voice mail may still be available, if the voice
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mail server to which calls are being sent is not in failover.
Advanced features like Call Park/Unpark, Priority Call, or Automatic Callback are not
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available. Most features on the Feature menu will not be available. Favorite features are
not available during failover.
Once the transition to a new server has occurred, changes to Avaya (A) Menu options can
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be made/saved during failover. Note that any new or changed settings for these options
will become effective when the phone fails back to its original server.
If the phone operates under the latest software (Release 2.5 or greater), Contacts can be
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accessed and changed during and after failover to the alternate server.
If the phone operates under the latest software (Release 2.5 or greater), the end user can
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access Home Screen Web links/pages during failover, however, any "click to dial" links will
not work until the phone transitions to the alternate server.
If users are part of a corporate Directory or database, access may be limited to local
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contacts only.
If the phone is logged out during failover, the local phone cache is cleared and the phone
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may become inoperable until it can be reset on the original controller after failback.
With SIP software Release 6.0 and later, the phone will accept calls from any of the
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proxies it is registered with when the phone is simultaneously registered to multiple
controllers. There is no visual indication to the user differentiating calls from different
feature servers. In the case of Multiple Feature Servers, one feature server can know
about one call on the phone and another feature server or controller can know about
another call on another call appearance. The second Feature Server does not have any
152 Deskphone SIP 9608, 9611G, 9621G, 9641G Administrator Guide Release 6.0.1