User Interface In Failover/Failback; User Experience During Failover Transition; Failover To A Secondary Controller For Alternate Registration (Ses F/O To Sm To A Non-Ast Controller); Moving Subscriptions From One Sm To Another Sm/Bsm (Branch System Manager) Due To Failover - Avaya 9608 Administrator's Manual

System Failover and Survivability

User interface in failover/failback

Failover (F/O) transition - Connection to SES/SM failed, the phone detects F/O and blocks
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new invites while the phone is in transition.
Stable in F/O where the non-primary proxy is the active controller.
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Fail Back (F/B) transition to normal - The phone detects that the primary server is up,
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regardless if the secondary is up. New invites are blocked while the phone is in transition.
The phone is in a stable Normal mode with SES/SM 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 phone 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 (SES F/O to SM
to a non-AST controller)
Transition is comprised of the following conditions:
Limbo - The phone has lost its connection to its primary controller, but has not yet detected
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this condition regardless of whether a user is on a call or not.
Acquiring Services - The phone has detected a lost connection to the primary controller
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and displays an Acquiring Services Screen if the phone is idle.
Call Preservation - During an active call, the phone has detected a lost connection to the
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primary controller and displays a Call Preservation screen.
Moving subscriptions from one SM to another SM/BSM (Branch System
Manager) due to failover
Transition is comprised of the following conditions for moving subscriptions:
Limbo - The phone has lost its connection to its primary controller, but has not yet detected
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this condition, regardless of whether a user is on a call or not.
Moving Subscriptions Interval (MSI) - The phone has detected a lost connection to the
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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.
154 Deskphone SIP 9608, 9611G, 9621G, 9641G Administrator Guide Release 6.0.1