Maybe remove .twinkle/ and check you you made the good choice in the user config.
I can't help you much but i remember that i made a mistake about ip to ip calls once.
Twinkle is a very good softphone, and i suggest everyone to try it:
http://twinklephone.com/
And remember to configure like this if you have a qt-mt not found problem:
./configure --disable-qt-check
