How Port Forwarding Works

With this evaluation, the 3CX Firewall Checker will send a port checker petition to the STUN server in the interface being assessed and asks that the STUN server create a link to the PBX in another IP address to the interface being assessed. 

#portchecker #udpportchecker #udpportcheck

Web: https://openport.net/how-to-check-udp-port-status/