The Failover Box includes Openvox FB40 4 port IPPBX Failover Box, and supports ISDN BRI interfaces. All of the products support asterisk PBX system. In most of the time, users need to reconnect the BRI/PRI line to a redundant server maintained by UPS when main PBX Server is power off. It may cause a little extra work for people who use simple and small PBX servers. But for those who run complex PBXs in server rooms, it becomes real problems. How to eliminate this problem? The release of OpenVox FB40/FD40 failover box for BRI/PRI answers it. The FB40/FD40 can automatically switch the BRI/PRI line to the redundant server when the power of the main PBX server has been cut off and will automatically switch back to normal when the power is on again. In this way, no more worries about getting the BRI/PRI line connected to the redundant server when the main server is down. The Failover Box fully supports asterisk from version 1.2 to 1.6. Its main features include: