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Yehey! just last week, our network administrator taught and trained us (technicians) on this so call Private Automatic Branch eXchange or commonly known as PABX or PBX system... what is this all about?
Private Automatic Branch eXchange - is a telephone exchange that serves a particular business or office, as opposed to one that a common carrier or telephone company operates for many businesses or for the general public. PBXs are also referred to as:

• PABX - Private Automatic Branch eXchange
• EPABX - Electronic Private Automatic Branch Exchange

wow! a new knowledge for me, though it is already been used by other large companies but this is new to me because i am not interested with this long time ago, but now....., NOT!.. ahehehehh