EPBX
Setup

EPBX is a More Beneficiary Scheme

If an organisation or office contain a number of phones and they have to talk among themselves mainly then epbax is a more beneficiary scheme normally when in telephone we dial a number then it routes to telephone exchange first and after that proceed to the dialed number so every time u call telecom operator it will charge for it but in case of epbax a company has to pay fix some of money and own a small exch when that company people talk among themselves the call need not have to go to telephone exchange and hence is cheaper.