I don't think the encryption issue is the big problem. I am sure skype's codec has been hacked already. The p2p issue could be addressed by just placing giant routers in isp's like the US did at the telcos. The bigger problem would be transcribing a million streams at once. Also, transcribing arabic words. Thats probably what they are mostly interested in.

There are good acoustic models for english but I doubt there are for arabic. Even if there were, the processing power requirement would be insane. I doubt amazon EC could handle a million streams at once even if they used smaller grammars focusing on suspicious words.