SIP trunk to ATA for failover on sip trunk?
 

In theory this should work but I am wondering if anyone has seen this done? Can you use a Cisco ATA connected to a POT Line. Seeing how server edition doesn't have the ports for connecting to a POT Line.

The POT Line is the failover number for the sip trunk numbers are the carrier level.

If there is a better way please let me know. Thanks