By Andreas M. Antonopoulos, Senior Vice President & Founding Partner, Nemertes Research Inc.
June 16, 2006

The FBI arrested a man in Miami on Wednesday for allegedly hacking the networks of Internet telephone service providers to fraudulently sell more than 10 million minutes of calls. This highlights the increase in security threats against VOIP and more specifically the escalation from simple denial/loss of service threats to more serious theft of service attacks

Converged networks lead to converged threats: VOIP is likely to suffer from both data attacks and voice attacks as data and voice are converged. As with any new technology there is a short “honeymoon” period during which attackers familiarize themselves with the new technology. In an article published in 2002, Nemertes predicted four stages of security threats emerging in voice technologies:

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