To convert a high availability over LAN deployment to high availability over WAN, you need to reinstall the second Cisco Unified CCX node and add it to the cluster over WAN. This is because the high availability over WAN deployment requires a different network configuration and a different license than the high availability over LAN deployment12

The high availability over WAN deployment allows you to have two Cisco Unified CCX nodes in different geographical locations, connected by a WAN link with a minimum bandwidth of 1.544 Mbps and a maximum round-trip delay of 80 ms. The high availability over WAN deployment provides disaster recovery and business continuity in case of a site failure12

The high availability over WAN deployment requires a “WAN Standby” license, which is different from the “Warm Standby” license used for the high availability over LAN deployment. The “WAN Standby” license enables the second Cisco Unified CCX node to operate in a partial service mode, which means that it can accept and process calls, but it cannot access the historical data or the configuration data from the primary node. The “Warm Standby” license enables the second Cisco Unified CCX node to operate in a full service mode, which means that it can access all the data and functions of the primary node12

To convert a high availability over LAN deployment to high availability over WAN, you need to follow these steps:

Backup the configuration and the historical data from the primary Cisco Unified CCX node2

Uninstall the second Cisco Unified CCX node from the cluster2

Reinstall the second Cisco Unified CCX node with the same software version and patch level as the primary node, but with a different IP address and hostname2

Apply the “WAN Standby” license to the second Cisco Unified CCX node2

Add the second Cisco Unified CCX node to the cluster over WAN by using the Cisco Unified CCX Administration web interface on the primary node2

Restore the configuration and the historical data to the second Cisco Unified CCX node2

Verify the high availability status and the data synchronization between the two nodes2

References: 1: Cisco Unified Contact Center Express Design Guide, Release 10.0(1) - High Availability [Cisco Unified Contact Center Express] - Cisco 1 2: Cisco Unified Contact Center Express Installation and Upgrade Guide, Release 10.0(1) - High Availability [Cisco Unified Contact Center Express] - Cisco