FAYYAZ, Yasir, Dost Muhammad KHAN, Faisal FAYYAZ, Salman QADRI, Shahid NAWEED, and Muhammad FAHAD. 2019. “The Evaluation of Voice-over Internet Protocol (VoIP) by Means of Trixbox”. International Journal of Natural and Engineering Sciences 10 (3):33-41. https://ijnes.org/index.php/ijnes/article/view/276.