David Endler and Mark Collier, «Hacking Exposed VoIP: Voice Over IP Security Secrets & Solutions»

Block debilitating VoIP attacks by learning how to look at your network and devices through the eyes of the malicious intruder. Hacking Exposed VoIP shows you, step-by-step, how online criminals perform reconnaissance, gain access, steal data, and penetrate vulnerable systems. All hardware-specific and network-centered security issues are covered alongside detailed countermeasures, in-depth examples, and hands-on implementation techniques. Inside, you'll learn how to defend against the latest DoS, man-in-the-middle, call flooding, eavesdropping, VoIP fuzzing, signaling and audio manipulation, Voice SPAM/SPIT, and voice phishing attacks.

Find out how hackers footprint, scan, enumerate, and pilfer VoIP networks and hardware
Fortify Cisco, Avaya, and Asterisk systems
Prevent DNS poisoning, DHCP exhaustion, and ARP table manipulation
Thwart number harvesting, call pattern tracking, and conversation eavesdropping
Measure and maintain VoIP network quality of service and VoIP conversation quality
Stop DoS and packet flood-based attacks from disrupting SIP proxies and phones
Counter REGISTER hijacking, INVITE flooding, and BYE call teardown attacks
Avoid insertion/mixing of malicious audio
Learn about voice SPAM/SPIT and how to prevent it
Defend against voice phishing and identity theft scams