I'm trying to to get my Firewall Test to pass, mostly just because it annoys me that it's failing. I have a Static 1:1 NAT configured for my 3CX server, and firewall rules permitting the traffic. Inbound SIP works without issues. However I keep failing the "Full Cone Test". I have a Juniper SRX firewall securing the network. What exactly is the "Full Cone" test and why would it still be failing with a 1:1 static NAT?