The Grandstream HA100 offers an automated failover solution for the UCM6510 IP PBX. When connecting between two UCM6510, the HA100 constantly monitors the operation status of both UCM6510 and automatically switches the system control to the hot-standby secondary UCM6510 in the event that the primary UCM6510 fails. Grandstream HA100 Key Features Connects and constantly monitors two UCM6510’s 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, and more 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 Thanks to its smart monitoring and automated failover capability, the HA100 is an ideal high-availability solution for the UCM6510 to ensure maximum total system reliability and uptime.