E. W. Atmaka, J. . Respati, A. . Wisnu H., and L. . Luthfia, “Comparison of Usage between Voice Switching Communication System (Vscs) Direct Speech (Ds) Vsat (Very Small Aperture Terminal) System and Voip (Voice Over Internet Protocol)”, MARCOPOLO, vol. 2, no. 3, pp. 349–358, Mar. 2024.