I have just installed 3CX phone system and the firewall tests have failed. Please tell me what I am doing wrong. I have opened both incoming and outgoing ports for TCP and UDP given the document http://www.3cx.com/docs/3cx-phone-system-v14-ports/ The screen shot for the failed tests are here https://postimg.org/image/9f0srf74b/. As you can see the "Full Cone Test Failed". I have added the ports in the Firewall. A screenshot is given here https://postimg.org/image/9f0srf74b/ Please tell me what I am doing wrong. Any help would be appreciated.