On Tue, 2005-10-25 at 19:31 -0600, Linsys wrote: > Finally, we sould all come up with a VPN (IPsec) Tunnel solution for VOIP, > this would NOT be vulnerable to this type of jitter injection technique, > however would require much more bandwidth. >
Why not use a DNS tunnel, as has been proven capable of streaming audio. Basically the data is sent as DNS lookups and replies as the response. There is a ping that has to occur to check if the remote system has any data, but these types of tunnels do have code for them already. Because it works off DNS the only way to break this is to have a dummy DNS server return the same IP and proxy everything. Something that would be noticed by many and undesirable for whomever manages that system. Many hotspots route DNS data even if you havent authenticated yet and they block virtually everything else one way or the other. ahem -- Trixter http://www.0xdecafbad.com Bret McDanel UK +44 870 340 4605 Germany +49 801 777 555 3402 US +1 360 207 0479 or +1 516 687 5200 FreeWorldDialup: 635378
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