I have a Cisco VG224 and a server running FreePBX. I would like to use the VG224 to register each analog port to an extension in FreePBX. I guess I effectively want a large ATA?
Depending on your FreePBX configuration, the integrated firewall might be detecting failed SIP registrations from your VG224 as attacks and automatically start blocking them.
What have you tried so far that is different than those posts ?