A private branch exchange (PBX) is a telephone exchange or switching system that serves a private organization and performs concentration of central office lines or trunks and provides intercommunication between a large number of telephone stations in the organization. As Transtel Communication (Pvt) Ltd,we also Supply and setup keyphone system also one of subsystem for the system integration. Keyphone or PBX in wired and wireless which can be connected in various formation such as incoming call, intercom, voice over internet protocol, video call, video conferencing and others. We do provide solution in designing and implementation on setting up the system.