For decades, EPABX is considered as one one of the best mode for business communications. They were developed using copper wires and operates on POTS (Plain Old Telephone Services). Presently, businesses are looking to extend their potentials and redesign their internal as well as external communication channel. The invention of IP PBX has revolutionized the business communication landscape. Basically, an IP PBX is a PBX phone system integrated using an internet protocol rather than traditional analogue services.