I will never ever install nitdroid for 3 reasons:
1. Maemo > Android. No discussion. When you'll run X11/wayland under android maybe we'll talk.
2. *****y community. If you say some thing doesn't work or ask about it all you get is "ZOMG YOU ***** YOU DON'T RESPECT DEV'S WORK!!!!"
3. Absolutely no documentation nor news. Only channel is drunkdebugger's twitter feed...

Btw, the problem with calls is getting a wrapper to ofono from android, and because android has no real portable middleware it's difficult. Nitdroid has to run a pulseaudio server and that's not easy either...