EPABX (Electronic Private Automatic Branch Exchange) or PABX (Private Automatic Branch Exchange) or PBX (Private Branch Exchange)- is a private telephone network, which serves the business communication in enterprises and organizations. But, IP-PBX runs digitally and is embedded with a rich set of features, including VoIP. Therefore, as a matter of fact, IP-PBX and EAPBX basically have the same functionality. However, EPABX is utilizing analog technology at a certain level. So, the companies prefer the IP-PBX over EPABX, most primarily to avoid the complexity of wires. If you want to know the benefits of using IP-PBX, then you can read here- IP-PBX vs EPABX.