The VoIP front end is very tempermental at best. I find that to connect with my N80IE, I must make the WLAN network that I'm trying to connect to the default connection and I must make the VoIP service that I want to use the default service. Then I go into the Internet Tel app and choose connect. The connection type switches back to manual, then I choose OK. The service tries to connect for a while and then I get a message that the connection has failed. When I press OK, the service is connected...
Pretty rediculous that I have to go through all that to connect but it works pretty consistantly.