RADMAND, PEDRAM, JAIPAL SINGH, ALEX TALEVSKI, MARC DOMINGO-PRIETO, and JOAN ARNEDO-MORENO. 2011. “THE IMPACT OF SECURITY ON VOIP CALL QUALITY”. Journal of Mobile Multimedia 7 (1-2):113-28. https://journals.riverpublishers.com/index.php/JMM/article/view/4727.