I have an unusual problem unless there is something that I have overlooked. When running my Huawei IDEOS on wifi, the sip server registered properly. However, when I turned off wifi and try to test it on the 3G network, it refuses to register. This is despite of the fact that I have already ticked Enable 3G under the integration settings of the software. Does anyone have any ideas? My other internet application works fine on 3G. Even the uDialer sip client works. Thx.