Backup Voicemail Server Operation

Last Updated : Jan 25, 2023 |
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The IP Office hosting the centralized Voicemail Pro server can be configured with the IP address of a backup Voicemail Pro server. If the centralized Voicemail Pro server becomes unavailable, the backup Voicemail Pro server is used to provide voicemail services.

During Normal Operation

Voicemail services and message storage for the IP Office is provided by the central Voicemail Pro server.
  • Call flows, greetings, recorded names, and configuration settings on the backup Voicemail Pro server are synchronized with those on the central Voicemail Pro server. The configuration settings that are synchronized include the registry settings, user variables, SMTP mappings, and alarms. However, the directory locations, settings specific to Voicemail Pro client, Campaign settings, Service SID of the Voicemail Pro service, and backup configuration settings are not synchronized.
    • Call flows defined on the central server are synchronized with the backup server.
    • Call flows defined on the central server cannot be modified on the backup server.
    • Call flows cannot be defined on the backup server.
    • Call flows defined on a distributed server are not synchronized to the central or backup servers.
  • Messages are synchronized, but the central Voicemail Pro server remains the message store.
  • The central and backup servers are synchronized regularly at defined intervals using SMTP SSL/TLS communication between the servers. If the servers fail to connect using SSL/TLS over SMTP, then plain text communication is used.

During Backup Operation

If the central server become unavailable to the network:
  • The backup server provides voicemail services to the IP Office systems.
  • New messages are stored on the backup server.

After Backup Operation

When the central server is restored to the network:
  • Call flows, greetings, recorded names, and configuration settings on the central server are synchronized with those on the backup server.
  • The central server sends a signal to the backup server to indicate that it is ready to resume control as the active Voicemail Pro server.
  • Depending on the mode of failback operation configured, the system administrator or the backup server initiates failback operation to reinstate the central server as the active Voicemail Pro server. For details on configuring failback operation, see Configuring Failback Operation.
  • Any new calls that arrive while failback is in progress are lost.
  • If the backup server becomes unavailable to the network before failback operation, the central server resumes control as the active Voicemail Pro server.

Configuring Backup Server Operation

  • The Voicemail Pro server software is installed as normal on the backup server computer. The Voicemail Pro server is not specifically configured as being a backup server.
  • The central IP Office hosting the primary Voicemail Pro server is configured with the IP addresses of both the primary Voicemail Pro server and the backup Voicemail Pro server.
  • The other IP Office are configured for centralized or distributed voicemail as normal.
Related links
Centralized Voicemail Pro
Manual FailbackGraceful FailbackAutomatic Failback