Which event activates the Avaya Aura Communication Manager Survivable Server for accepting registrations?

The event that activates the Avaya Aura Communication Manager Survivable Server for accepting registrations is the registration of a Media Gateway or an Avaya Aura Media Server with the CM Survivable Server. When the Media Gateway or media server registers, it signifies to the Survivable Server that endpoints or resources are becoming operational within that environment. This registration acts as a trigger for the Survivable Server to begin accepting endpoints and enabling services in the event of a failure of the Main CM Server.

This mechanism is crucial for maintaining service availability and continuity during an outage, as it ensures that all necessary components are aware of the active state of the Survivable Server. By allowing registration of these components, it prepares the system to handle calls and manage resources, effectively allowing users to continue communication without interruption.

Other choices do not effectively initiate the registration process or the operational state of the Survivable Server, focusing instead on scenarios that might occur after the activation or do not represent a direct activation trigger.