We are setting up two 50 user sites using Asterisk. The one site will be using 16 PSTN lines from the exchange and the other will be running a single PRI line. I was wondering if anyone had any ideas on how we could get the Asterisk telephone system to fail over to a few analog telephone extensions in the event of an extended power failure. Having the Asterisk server on a UPS is obviously the first line of defence but that isn’t going to last an entire day or two. Does anyone know of any channel bank or gateway or some other device to solve this problem? A normal analog PBX automaticaly fails all its incoming lines onto the extension lines in the event of a power failure and we need to achieve the same kind of effect with Asterisk.
Any ideas would be greatly appreciated