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From the list given, looks like that would be Tox. It's got IPv6 and everything.

Unfortunately http://tox.im says "Tox isn't ready yet, downloads will be available soon!"

We tried using WebRTC, unfortunately the recording stuff isn't rolled out yet. So we're doing the interviews using Google Hangouts still, for now.

Hole punching is becoming more and more nightmarish. I think we need ipv6 addition first.