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The Mysterious "stun" application

L4 Transporter

Does anyone have a understandable explaination of this application called "stun" from what I can gather its used for things like skype and facetime, but it generates a lot of traffic in my network. While yes we are lync/skype in house and there are the occosional calls out to the internet, I see this application going out to google public IPs on port 19305 and 19302, I see ports 5055 being used as well. How do you control this application?

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