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M. Gruber, F. Fankhauser, S. Taber, C. Schanes, T. Grechenig:
"Trapping and analyzing malicious voip traffic using a honeynet approach.";
Vortrag: The 6th International Conference on Internet Technology and Secured Transactions, Abu Dhabi, UAE; 11.12.2011 - 14.12.2011; in: "Proceedings of the 6th International Conference on Internet Technology and Secured Transactions", IEEE, (2011), ISBN: 978-1-908320-00-1; S. 442 - 447.

Since several years the number of VoIP (Voice over
IP) infrastructures increases and, consequently, the number of
VoIP users increases too. Under these circumstances VoIP systems
get more and more attractive for attackers, since the probability
of successful attacks increases and attackers gain benefits, e.g.,
money with fee-based telephone numbers. Therefore, this paper
describes a solution to capture, monitor and report VoIP attacks
to gain more knowledge on current and new VoIP attacks.