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Aren't Skype supernodes more like DNS? Just telling the two parties how to connect with each other and then getting out of the middle?

Supernodes also have the ability to relay the VoIP traffic if the callers cannot form a P2p connection. More info here http://saikat.guha.cc/pub/iptps06-skype/

It would be a small change to the supernode logic to enable relaying of calls for wiretap requests.