Hi everyone, I have setting up 3cx Phone system in my office succesfully. I am able to make and receive call when i am in office and when i am out of the office (using a nokia e65 conneced to wifi). I am not able to make /receive calls when i am on a network with the dfl 200 firewall (all my customer have this device). I have tried to change the policy, i have tried to open all port ...etc , but not working. Any suggestion is welcome.