Basorun, Oluseyi, and Mnse Mnieee Mieee. “Implementing Enterprise VoIP Deployment”. Journal of Advance Research in Computer Science & Engineering (ISSN 2456-3552), vol. 3, no. 4, Apr. 2016, pp. 04-09, https://doi.org/10.53555/nncse.v3i4.424.