Unified Comms

D(e|i)aling With VoIP: Robust Prevention of DIAL Attacks

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Executive Summary

This paper carries out attacks using Internet services that aim to keep telephone devices busy, hindering legitimate callers from gaining access. The paper uses the term DIAL (Digitally Initiated Abuse of teLephones), or, in the simple form, Dial attack, to refer to this behavior. The paper develops a simulation environment for modeling a Dial attack in order to quantify its full potential and measure the effect of attack parameters. Based on the simulation's results one performs the attack in the real-world. By using a Voice over IP (VoIP) provider as the attack media, the paper manages to hold an existing landline device busy for 85% of the attack duration by issuing only 3 calls per second and, thus, render the device unusable.

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