[asterisk-users] analog line cards / adapter

[Erik Wartusch]

Hi,

Is anybody aware about a device (e.g. PCI card) that can handle a analog phone 
for Asterisk and can loop through the line directly in case of an power fault 
in the server. Its for an emergency phone in an elevator, so if the power is 
down the phone has to have the possibilite to make a call outside (and 
powered of course over the POTS net), in normal operation it should be 
connected to Asterisk and the Server. Some suggestions or running 
environments?
Thanks
Kind Regards
Erik