I installed this a few days ago and thought I had it working based on this video:
http://www.youtube.com/watch?v=bDlpAXbHOa8 but it seems that the phone app is a different one than what you get when you actually receive a call, so I'll have to change this and play with it.
It's a shame that what seems to be a pretty powerful app has just about zero documentation AND does not have very intuitive configuration settings. Which is why I suspect this thread was started. If I do get this working with incoming calls, I'll post by rules here...