Hello, I have 3cx v12.5 thats works fine. The last 2 weeks there are a lot of hacking tries on my PBX. Now i make in the security IP blacklist the following rules: ip range 0.0.0.0 subnetmask 0.0.0.0 BLOCKED!! All the ip nummers will be blocked. The following ip numbers i set on ALLOWED 127.0.0.1 (local ip, just in case) Mine WAN IP number Mine Local IP range (in mine case 192.168.1.0, subnetmask 255.255.255.0) Mine TRUNK IP Numbers I set on allowed And my IP number of my private house This works great, because ALLOWED rules overruled the BLOCKED rules. But when i want to make a call to a outside phonenumber, there is NO respons. Outside Calls to Inside works great. When i make a rule in the ip range. 18.104.22.168 with subnet mask 255.0.0.0 (ALLOWED) i can make also calls from inside to outside. Now is my question: Why??? What is the reason i must open IP range 8.x.x.x.x to make i call?