- Connects and constantly monitors two UCM6510 together for high availability- Smart failover solution that automatically switches to a hot-standby secondary UCM6510 if the primary one fails- Up to 14 LED indicators showing real-time status of all of the telecom lines, network links, auxiliary devices, etc- Gratuitous ARP forces SIP endpoints to refresh the MAC address of the new UCM6510 without interruptions- Fast 10 to 50 second system switching time depending on the number of registered endpoints