In the Messaging system, the following failovers might occur:
Application server failure: Users experience intermittent failure as there is an attempt to synchronize the cache data specifically voice messages, and that times out and causes the delay as one of the application server is not working. Administrative actions like Password Update, User Greeting Update will also fail as the data synchronization between application servers fails. Calls to the server that is not working experience fast busy.
Storage server failure: The system goes into offline mode. In offline mode, the system does not allow administrative updates.
Storage and application server failures: The system does not allow administrative actions and the Messaging system only allows you to leave voice messages.