My dad's N800 did work using XL1200c way.

But I did it a different way because it didn't work for me.

(Make sure camera app is uninstalled)
Shutdown N800
Take out battery for 10 mins
Replace battery
****Pull out the Camera****
Start N800
Start New Internet Call
(it should work)

I reboot with the camera back in and it was working fine.
I installed Camera app and it worked too.

Enjoy!