I have a fresh FreePBX install in Australia that is behind a double NAT. The Telstra provided DSL router has it’s own subnet 192.168.15.x/24 and I have s Sophos XG Firewall behind that with a 192.168.4.x/24 subnet. All ports UDP/TCP are forwarded from the Telstra modem to the Sophos firewall. The PBX shows all green in the connectivity/Sipstation tab including the firewall check. I can make outbound and inbound calls but no audio either way. I can’t change the modem, I need my firewall and I can’t setup a VPN or IAX trunks between the two networks. Does anyone have any other solutions that might work. It appears some people have gotten double NATS to work with FreePBX and others say it is impossible. Any help would be appreciated. Thanks.