This is a very interesting concept. This one may be worth trying out.
Vo2IP is a proof of concept attack which demonstrates a new type of VoIP threats, the VoIP covert channel. With Vo2IP, you can establish a hidden conversation by embedding further compressed voice data into regular PCM-based voice traffic (i.e. G.711 codec). Therefore anyone who is wire-tapping your conversation will decode something completely different from the actual conversation – granted that he is not aware of the use of Vo2IP.
[tags] VoIP Attacks, Wire-Tapping, VoIP[/tags]