Hello to all. I state that I am almost crazy. I installed the 3cx version 10.0 with one attached to it yalink t20 and 2 smartphone with Android installed them with the 3CX software. the problem that feedback and that with smartphones connected 3g I can not have them on the phone to make a call to another phone it t20, t20 while the phone is connected to the LAN can call the 2 smartphone. I have tried to put the server in SMS but I do not care. if I connect the phone to the network in VPN server works fine. doors open from the server is the 6050 tcp and udp, tcp udp 9000 to 9048, 5005 to 5100 tcp and udp. the server's firewall is disbilitato. when I make a call to an extension from smartphones, I enter the inter poop a few seconds and hang up. where am I wrong?. Can you help me?. Thank you in advance.