An EPABX (Electronic Private Automatic Branch Exchange) system is an internal telephone switching system used within offices and organizations for efficient call management. It allows multiple internal extensions to communicate with each other without using external telephone lines.
EPABX systems manage incoming and outgoing calls and automatically route them to the required department or extension. They support features like call transfer, call hold, call forwarding, auto-attendant, and voicemail. The system reduces communication costs by minimizing the use of public telephone networks for internal calls.

Modern EPABX systems can integrate with IP telephony (VoIP) and computer networks. They are ideal for offices, hotels, hospitals, factories, and commercial buildings. Overall, EPABX improves communication efficiency, professionalism, and centralized call control.