Dewanti, R. A., M. D. Atmaja, and N. . Zakaria. “Comparative Analysis of Voice Quality on ILBC and Speex Codecs Server PBX With Voice Comparison Method”. Journal of Telecommunication Network (Jurnal Jaringan Telekomunikasi), vol. 12, no. 3, Sept. 2022, pp. 145-52, doi:10.33795/jartel.v12i3.333.