A Private Branch Exchange (PBX) is a telephone exchange that serves a particular business, office or luxury apartments, as opposed to one that a common carrier or telephone company operates for many businesses or for the general public. The electronic private automatic branch exchange (EPABX) is equipment that has made day-to-day working in the offices much simpler, especially in the area of communication. The EPABX may be defined as a switching system that makes available both internal and external stitching functions of any organization. The selection of an EPABX is a difficult task and requires deep knowledge of traffic pattern of the office. By using an EPABX both the internal and external needs of the organization are fully served. With the advent of powerful microprocessors and advancements in the field of computers, the EPABX can boast of versatile features. Hotline can be established between the boss and his immediate subordinates. The feature of a call transferring and forwarding is another area enabling mobility of the users.
