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Configure the Firewall
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Debugging VOIP Calls - Exele
SOLVED: If you want to connect to 3CX remotely using the 3CX Apps, you only need to port forward/NAT port 5090 (TCP/UDP) on the firewall in front of the 3CX PBX
Guide on How to Configure pfSense for 3CX Phone System
Port Forwarding 3CX - A Complete Guide - Port Forwarding Hub
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3CX Firewall Check failed on Sophos XG210 - Discussions - Sophos Firewall - Sophos Community
Calaméo - Call Center Ingles Convertido
3CX port forwarding in Fortigate (static NAT 1:1) | HOTKEY404
