I have a similar problem where if I make a skypeout call it just hangs up on me and will not ring or connect. Skype to Skype works totally fine.

I have been told that SkypeOut will ring one time to the person I am calling and then hangs up.

Issue appeared after messing with the following tweaks at:
http://talk.maemo.org/showthread.php?t=73315

And possibly from:
Power Kernel v52 (just released)
http://talk.maemo.org/showthread.php?t=89823

And possibly from:
cell-modem-ui

More Info:
I don't use a sim card

I also have the $3 Unlimited US/Canada SkypeOut Plan.