Lee, Chang-Yong, Hwan-Kuk Kim, Kyoung-Hee Ko, Jeong-Wook Kim, and HyunCheol Jeong. “A VoIP Traffic Monitoring System Based on NetFlow V9 ”. International Journal of Advanced Science and Technology 22 (June 30, 2017): 01 - 08. Accessed May 18, 2024. http://sersc.org/journals/index.php/IJAST/article/view/55.