Video: Defcon 19 - Sounds like Botnet

Iftach Ian Amit is a Information Security Expert with vast experience ranging from low level technical expertise and up to corporate security policy, regulatory compliance and strategy. BlackHat and DefCon speaker, with vast experience in public speaking and private customer focused seminars

Itzik Kotler is an internationally recognized security expert coupled with a remarquable sens of professionalism. 

The Defcon 19 presentation  Sounds like Botnet is a presentation on VoIP Botnets. The talk puts a glas on: 

  1. VoIP Security
  2. VoIP Dangers
  3. VoIP Skills and Hacks