[cl3misch]

Without data going through the server it should be pretty cheap to host, right?

[dkraj]

That is why there are public STUN servers available by google that any one can use: stun.l.google.com:19302 stun1.l.google.com:19302 stun2.l.google.com:19302 stun3.l.google.com:19302 stun4.l.google.com:19302