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Defenses Against Botnet-Aided Spam over VoIP

Juergen Quittek, Saverio Niccolini, Sandra Tartarelli, and Roman Schlegel evaluated 14 techniques for fighting VoIP spam. They rejected simply outlawing VoIP spam as impossible to enforce. Likewise, they rejected charging fees to the sender for unwanted calls as “unrealistic.” They see value, however, in defenses such as Turing tests, pattern/anomaly detection, greylisting, etc., if they can be combined into a multilayered defense such as the one they outline in this paper.

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