Although Linphone works really well, I have a little problem.
When I first start Linphone, or just simply the wizard, Linphone 'next' button is gray. (Maybe its name is not next, but that button, I don't really remember) However I filled every mandatory field. Finally I realized the problem. My provider gave me a username which contains a * (asterisk).
So I could connect but it was tricky. I had to save without the "*" and later Linphone ask my username/passwd again, and then I could change it to my real username.
Since this is not my fault, I mean I didn't choose this username, it's a little bit inconvenient.
Could you fix this problem, someone might have this problem too.