Dear Kevin and other 3CX forum members, I've installed the 3CX Free edition on Windows XP Pro, in the internal area I'm using private IP block (192.168.0.36), behind the ADSL broadband router. I can use perfectly this installed IP PBX with Softphone. But after trying to registering from outer site using WiFi hotspot connection I cannot reach the 3CX server (I've use dyndns on the broadband router, disabled the windows firewall and already open the UDP port required by the 3CX, also put the 3CX Server in the DMZ of my Draytek Vigor 2600VG broadband router). Please help me to solving the registration problem with this condition. Btw, I can accessing the 3CX console from the WiFi hotspot and other outside area. FYI, example in the softphone proxy server i'm fill with xxx.dyndns.org:5060, also use stun xxx.dyndns.org:5060 and other user id and password as i'm configuring in the 3cx system. Thank you for your help and attention.