CTI applications can connect to one or two AE Services servers. When the active AE Services server fails, the alternate server takes over the VIP address. CTI applications reestablish the connection to DMCC, CVLAN, and TSAPI services.

AE Services preserves the DMCC service status information. During a failure, the DMCC service replicates the status information to the new active server. Restore DMCC sessions on CTI applications and verify that all monitors and registrations are active after a failover. When CTI applications reestablish the sessions, the DMCC service sends event messages to the applications for any resources that could not recover.

AE Services does not preserve the CVLAN and TSAPI status information. If CTI applications connect to only one active AE Services server, the failover might result in data loss. CTI applications that use TSAPI and CVLAN services reestablish socket connections, monitors, and registrations. TSAPI applications also reinitiate route registrations.

For dually connected CTI applications, the failover does not affect CTI application messaging.