Electronic Private Automatic Branch Exchange (EPABX), it is a private telephone network which is used within a small or large organization for communication purpose. There are so many types of Epabx available in market. In this course you will learn about all types of Pabx. How to install in a building and how to troubleshoot the faults of these devices. EPABX system can link by using so many different types of communication channels like ISDN (Integrated Services Digital Network), Analog signal or (VoIP) Voice over IP.