User Experience During Failover Transition - Avaya 9608 Administration

System failover and survivability
Fail Back (F/B) transition to normal - The deskphone detects that the primary server is up,
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regardless if the secondary is up. New invites are blocked while the deskphone is in
transition. The deskphone is in a stable Normal mode with Session Manager as the active
controller. Any cached changes (for example, to Contacts or other Avaya Menu options
and settings) are updated to the PPM once the deskphone is registered back to the
primary controller.

User experience during failover transition

SIP software release 6.0 expanded deskphone reliability during the transition from one
controller to another.
Failover to a secondary controller for alternate registration (Session
Manager to a non-AST controller)
Transition is comprised of the following conditions:
Limbo - The deskphone has lost its connection to its primary controller, but has not yet
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detected this condition regardless of whether a user is on a call or not.
Acquiring Services - The deskphone has detected a lost connection to the primary
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controller and displays an Acquiring Services Screen if the deskphone is idle.
Call Preservation - During an active call, the deskphone has detected a lost connection to
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the primary controller and displays a Call Preservation screen.
Moving subscriptions from one Session Manager to another Session
Manager/Branch System Manager (BSM) due to failover
Transition is comprised of the following conditions for moving subscriptions:
Limbo - The deskphone has lost its connection to its primary controller, but has not yet
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detected this condition, regardless of whether a user is on a call or not.
Moving Subscriptions Interval (MSI) - The deskphone has detected a lost connection to
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the primary controller and since it has already registered with a non-primary controller, this
is the interval between limbo and successful subscription to the non-primary controller.
The subscription can be moved regardless of whether a user is on a call or not. The Call
Preservation Message Box or the Acquiring Services screen are not displayed during MSI.
Call Preservation - During an active call, the deskphone has detected a lost connection to
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the primary controller and exhibits media preservation behavior.
The failover icon displays on the Top Line when failing over to a non-AST controller (for
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example, Audiocodes) or in the very short interval after limbo and before a successful
subscription from one Session Manager to another Session Manager or BSM in the same
community.
162 Administering Avaya 9601/9608/9608G/9611G/9621G/9641G IP Deskphones SIP
Comments? infodev@avaya.com