I have a N80ie version 4.0707.0.7 RM-02.
I can succeassfully register and use a VOIP service using the N80's SIP client when connected over my WLAN network. If I use the same configuration over my UMTS provider the client cannot register.
Please consider that:
1) The UTMS connection works properly. I use it regularly for web, e-mail and SIP calls using a third party client (fring)
2) When connected over WLAN the Nokia SIP client works perfectly.
Can anybody help? Thanks