MALEKI, Esmaeil Nik; MIRJALILY, Ghasem. Step by Step Methodology for Implementation of the Telephony Services on Data Networks. International Academic Journal of Science and Engineering, [S. l.], v. 2, n. 2, p. 121–145, 2015. Disponível em: https://iaiest.com/iaj/index.php/IAJSE/article/view/1304. Acesso em: 23 sep. 2026.