Chapter 2. SIGNALING: SIP SECURITY
SIP (Session Initiation Protocol) is a very common VoIP signaling protocol. It often dominates the discussion of VoIP security; however, just like the Yankees and the Red Sox, it gets more attention than it actually deserves. H.323 is probably the more common signaling protocol in enterprise environments; however, because H.323 is very complex and not easy to acquire, it is often overshadowed by SIP. (See Chapter 3 for more on H.323 security.)
This chapter is dedicated to SIP basics and security attacks, including authentication, hijacking, and Denial of Service. We'll also focus on security attacks against VoIP infrastructure, specifically SIP User Agents, Registrars, Redirect servers, and Proxy servers. For ...
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