Safarik, J., Voznak, M., Rezac, F., & Macura, L. (2013). IP Telephony Server Emulation for Monitoring and Analysis of Malicious Activity in VOIP Network. Communications - Scientific Letters of the University of Zilina, 15(2A), 191-196. Retrieved from http://journals.uniza.sk/index.php/communications/article/view/679