PBX stands for private branch exchange. This is a private telephone network where users can talk with each other. A PBX operates an organization's internal telephone network, as well as users, can communicate externally. You require wires and telephone sets to set the PBX system in your organization. Traditional PBX would have their phones while with the new technology have modified the customer telephony landscape and introduced IP PBX. In this, phone calls are distributed via internet protocol as a basic transport technology. IP PBX brings many possibilities. In terms of trunks and extensions, it allows unlimited growth.