So, I launch the Firewall check.. I got many errors, all like this:
Testing SIP Port 5060 using STUN server: stun.voip.eutelia.it:3478
Resolving STUN server stun.voip.eutelia.it ... Resolved to: [83.211.9.232]
[Test1] Reachability test ... Resolved Public IP: 88.87.124.182:13900
STUN server...