Conditions that initiate Connection Preserving failover and failback

Last Updated : Apr 25, 2014 |
Connection Preserving failover and failback begins with the loss of the H.248 network connection between the gateway and the primary server. During the time that the gateway migrates to another server for its call control, Connection Preserving failover and failback preserves the voice path after it migrates to the new server. Loss of the H.248 network connection causes the gateway to failover or failback to a new server:

  • Main server to Survivable Remote Servers or Survivable Core Server

  • Main server back to itself after system reset

  • One Survivable Remote Servers to another Survivable Remote Servers

  • One Survivable Core Server to another Survivable Core Server

  • Survivable Remote Servers to a Survivable Core Server

  • Survivable Remote Servers/Survivable Core Server back to main server after expiration of the Link Loss Delay Timer that clears out calls on the server.