Hello,

i am currently trying to use the SIP Service of my German provider Unitymedia via the Nokia N900. It works very well over Wlan but doesn't work at all over 3G from O2 Germany.

Are there any tools or aps I can use to improve the build-in SIP Service?

I've already tried a lot of configurations. With Wlan it works with the following:

Public Address: nXXXXXX_X@ssl2.telefon.unitymedia.de
User: nXXXXXX_X
Transport: Auto
Proxy: None
Port: 5061
Discover public addresses: Yes
Loose routing: No
Keep-alive mechanism Auto
Keep-alive period Auto
Stun: No Stun server available

Would be very nice if someone could help me.

Greets
Vinc