Hello Everyone, I have 3CX 1.1.5 installed on iPhone 4 and it works great except when I'm off WiFi and using AT&T's 3G network. Here's the scenario: 3CX works perfect with LAN WiFi going to PBX Server. 3CX works perfect with offsite WiFi going through WAN to PBX Server. (e.g.: it works perfect when I'm on home WiFi and connect to the PBX server at the office) 3CX places call and shows connected but there is no 2-way audio when I'm on AT&T's 3G network. I figured if 3CX works perfect on WiFi (no matter where I'm at) then it should work on 3G...unless AT&T has decided to block SIP connections; 3CX use to work on AT&T's 3G. Has anyone experienced this and could perhaps provide a solution?