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VoIP protocols: A technical guide

Today, many companies are replacing traditional telecommunications services with Voice over Internet Protocol (VoIP), using their own IP network infrastructure to slash phone bills and increase productivity. However, IP telephony terminals, call servers, proxies and gateways create new attack targets, and converged voice/data networks can fall victim to new exploits.

Like all new technologies, VoIP implementations require careful design, testing and analysis to identify and eliminate security vulnerabilities, and reduce the risk of compromise. This guide reviews the two main protocols that power VoIP -- Session Initiation Protocol (SIP) and H.323 -- and their known vulnerabilities, as well as how functional protocol testing ("fuzzing") can help defeat such problems. VoIP protocols: A technical guide

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