Hi, I am new to 3CX PBX and am having trouble registering external softphones. I have configured the software with the pre-requisite ports on our firewall and ran the firewall checker and everything passes with no errors. I have tried all different type STUN servers that are available publicly and my softphones(X-lite 3.0 and 3cx) and Nokia n800/N810 will not register. I am getting a 408 timeout error. The 3CX client using the tunnel works perfectly. However, most of my clients are Nokia units. There must be something really simple I am missing. Installed on Win2008 R2 Std (64-bit) (Windows Firewall disabled) The setup is strictly for device to device communications. No pstn/external voip providers used. I have this running on Asterisk. The only difference is that the Asterisk server sits on the public internet so STUN is not required. Thanks. Steve H.