Avaya 9601 - Survivability Configuration Examples

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With SES and non-AST controllers, contact data is cached until the maximum cache size of 25

contacts is reached; configuration data is cached without limitations. With SM, the PPMs are in sync

and the data is sent to the PPM; data is cached only in case of failure.

Moving subscriptions to a secondary SM/BSM for simultaneous registration has the following effects

on call states and transitions:

• Transition from one SM to another SM/BSM is comprised of:

- Limbo - The phone has lost its connection to its primary controller, but has not yet detected

this regardless of whether a user is on a call or not.

- Moving Subscriptions Interval (MSI) - The phone has detected a lost connection to the

primary controller and since it has already registered with a non-primary controller, this is the

brief 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.

- Call Preservation - During an active call, the phone has detected a lost connection to the

primary controller and exhibits media preservation behavior.

• The Call Preservation Message Box or the Acquiring Services screen are not displayed during

the Moving Subscription Interval (MSI).

MSI transition and failback to the primary SM occurs according to the failback behavior described in

3. Select the active controller on page 128.

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