Thank you - now at least I know that a) I'm not the only one who looks for SIP and b) I really did not miss an application.

Gizmo, btw, would not be what I'm after even if it had this "wnd account"-thing. I always feel its too "big" (I don't want to use the word "bloated" here because Gizmo seems to offer good features for its size, but they're no features I need).

I would feel very comfortable with something like Linphone. Linphone can even be run as a command line application and could be further stripped down by not including the part that does the video conferencing.

Can somebody try to port it? Christmas wuld be a nice release date