ABSTRACT
PBX is the term used for most business telephone systems. The letters stand for Private Branch Exchange. Private means that the system is on your premises as opposed to public mean ing a similar system used by a telephone company. Branch refers to the fact that the cables connected to the PBX branch out to each office desktop, connecting the telephones to the PBX. Ex change refers to the activity going on within the PBX known as switching (or exchanging) connections between telephones and outside lines that connect your PBX to the outside world and your calls to telephones at the other end of the call. The PBX is also called a switch which is short for switching system.
