Firewall tests are failing. Can we get updated list of all STUN IP addresses?

[TPR3CX]

Greetings,

We are testing our 3CX on the Firewall tool and we seem to be coming up with new IPs everytime we test.

The test tool first resolves these four hostnames:
stun-us.3cx.com
stun2.3cx.com
stun3.3cx.com
sip-alg-detector.3cx.com

A quick fix would be to open the ports to the whole world but we would rather avoid that and only open them to our SIP Trunk Providers and 3CX STUN Servers.

 

[NikosT_3CX]

@TPR3CX what are the ip addresses you get as a return ?
Also what DNS server you have setup at the network where the PBX is installed at ?
Please PM me to check this out further.