[wolfgang]

I can understand that lots of people are getting very excited about this, because the internet is all over the place and now, whow, we can even use it to talk to each other. However, the problem is simply that this is a classical example of inadequate application of a technology.
The internet is based on TCP/IP networking, which is inherently a data network and makes absolutely no guarantees with regard to delays or even guaranteed delivery of individual packets. And in reality, the further away from you the other side is, the bigger the latency. Which isn't much of a problem if you just phone within the neighbourhood. But as soon as you go intercontinental, typical latency is around 500ms or more (depending on the time of day), and that's when your conversation is getting a bit awkward (like talking on the radio to somebody on the moon, you always have to wait for 2 seconds before the answer comes back).
So in short: this will work for short distances, but it will never take off for long distances. And where exactly is the advantage for the consumer? Short distance calls are either free or very close to free on most telephone networks anyway!!!