VoIPはセキュリティ上の脅威としてトップレベルに位置する機能です。Zone-Hに書いてある内容が幅広いSIPデバイスに適用できるとするとかなりの脅威です。
The research that was published indicates that, for at least one vendor, it is possible to automatically call a SIP device from that vendor and have it silently accept the call, even if it is still on the hook – instantly turning it into a classic bugged phone. Whereas historic telephony bugs needed physical targeting of the line running to a property or place of business, the presence of VoIP in the equation allows bugging from anywhere in the world with equal ability. Now anyone can do from their armchair what only spies and law enforcement used to be able to do from inside the telephone switch / pit / distribution board, though it’s still illegal to do so.
少なくとも一つのベンダのSIPデバイスは話し中でも密かに着信し盗聴できた、としています。盗聴器が必要ないので気軽(!?)に盗聴できます。
どれくらいのデバイスに同様の問題があるか気になります。
参考：
SIP Phoneの検索結果
http://www.google.co.jp/search?q=SIP+Phone
