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The change is interesting (though not that new it seems), but Microsoft flatly state that calls do not go over supernodes [1]:

"This has not changed the underlying nature of Skype’s peer-to-peer (P2P) architecture, in which supernodes simply allow users to find one another (calls do not pass through supernodes)."

Now obviously this could be a lie, but it should be fairly simple to prove one way or another - simply force a call between 2 NAT'd clients, and trace where the voice packets go, it'll either be to one of these newly centralised supernodes, or somewhere else?

1 - http://arstechnica.com/business/2012/05/skype-replaces-p2p-s...

Calls don't go over supernodes: I frequently call people on Skype for a conference, with my brother participating on the same network, and when the call drops, my brother and me can still talk. Might be that this is an exception for extremely local connections, but I've had similar experiences in other situations as well.

That doesn't prove anything at all.

Read the blog post. Calls still don't go over supernodes by default, it was just changed so that specific calls can be routed over them if desired.

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