Avaya Contact Center – Extended Capacity supports disaster recovery for geo-redundant HA deployment without Layer 2 networking. The solution does not ensure call and state preservation in case of data center failure.

Each data center contains two Configuration Server and Routing Core Server instances. One Configuration Server and one Routing Core Server in the primary data center are active. The corresponding servers in the secondary data center are in survivable state.

Each data center contains one alternate Routing Core Server and Configuration Server. The Configuration Server and Routing Core Server pairs in the data centers have independent virtual IP addresses so that if an active server in a data center fails, the alternate server can take over the VIP and continue operation.

In case of the data center failure, the contact center assumes the primary data center to be unrecoverable and restores the data and contact center services on survivable servers in the secondary data center. If the data center failure occurs, the contact center drops all calls and logs out all agents. After survivable components become active, the contact center can start processing calls again.

The following diagram provides an overview of the contact center topology with disaster recovery in the geo-redundant HA deployment: