Pardo-García, C.E., Diaz-Leal, N.R. and Gómez-Llanez, C.Y. (2020) “IP PBX as a communications service integration tool for UFPS based on ITIL best practices”., AiBi Journal of Research, Administration and Engineering, 8(3), pp. 74–79. doi:10.15649/2346030X.734.