I've used the webrtc project people link here as well, but it is worth pointing out that Skype has an API. I'm not even a Windows programmer in general, but it

I've used the webrtc project people link here as well, but it is worth pointing out that Skype has an API. I'm not even a Windows programmer in general, but it only took me an afternoon to write a tiny app for a Mom's five year old that just calls Mom immediately and automatically as soon as it is started and has a locked preferences page for setting everything up.