![]() Check Blocked Ports in Firewall via Command Prompt. Many firewalls only allow connections to be initiated from the private network. You firewall is not allowing calls to your SIP phone. ![]() If you want to configure VoIP Blacklist on your own Asterisk PBX, then you will need to install Fail2ban. This allows the traffic to help overcome various firewall and mobile network issues and allows a simpler route to configuring remote extensions on your system. Anyone with experience with SIP/firewall issues? Thanks pfSense + 3CX = Sporadic Behviour. no more remapping as in my initial post) resolving 'stun-eu. I set up port forwarding and the firewall checker passes every time. The EdgeMarc 4550 features 4 routed RJ45 LAN ports, 1 WAN port and 2 USB ports. So I just replaced my relatively crappy TP-LINK router (TL-ER5120) with a pfSense box. You will then need to configure a firewall rule to allow either the SIP or H. ![]() If you have used the 3CX iso then the IP tables should en in place and all ports needed would be open be default. Depending on the operating system of your computer there are different ways to check if a certain port is being blocked by your Internet service provider. The 3CX Firewall Checker is a tool which can be used to check that your router or firewall allows network traffic with VoIP Providers, Bridges, External Extensions and 3CXTunnel connections. The fact you are seeing this on different ports each time is odd. ![]()
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