Implementation of Secured Portable PABX System of Fully Fledged Mobility Management for Unified Communication. International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) DOI: 10.31695/IJERAT, [S. l.], v. 5, n. 2, p. 80–92, 2019. DOI: 10.31695/IJERAT.2019.3389. Disponível em: https://ijerat.com/index.php/ijerat/article/view/47.. Acesso em: 7 may. 2024.