Yes, I have been through these steps (with some small differences) and now eventually the N800 sees the PC and the other way round. When calling, it rings on the other side and shows the own camera view in small size but the other side's video/sound is not coming through.

I have repeated series of steps several times with different outputs and so my conclusion was that either the program is unstable or they are modifying it. Considering that the IN call invitation became live only today (it worked for some earlier) it is likely that changes are made to the programs.