[Asterisk-Users] Digium TDM400 Failover on Power Loss

[Chris Mason]

This site has what you need and some other products that might also work
http://www.gkinc.com/OverviewUT8.htm

They will sell direct to you. I haven't purchased yet but I intent to use
them for the same reason. You could trigger off the computers power supply
so turning off the server flips the lines over to standby handsets.

Chris