Ulisses, Joaquim, Hermenegildo Cassoada, and Ngombo Armando. “QoS Analysis of Codecs and Protocols Used in VoIP SystemsSTEMS”. Gregório Semedo: Science and Development 1, no. 1 (December 15, 2024): e22. Accessed September 14, 2025. https://revistacdugs.ao/article/view/22.