Private Branch Exchange (PBX) is a telecommunication system that serves as the central hub for managing and facilitating communication within an organization. It is a private telephone network that enables internal communication among employees and facilitates connections to external phone lines for communicating with individuals outside the organization.

Key aspects and functionalities of PBX systems include:

Call Routing: PBX systems intelligently route incoming and outgoing calls, ensuring they reach the appropriate extensions or external numbers.

Internal Communication: PBX enables employees to communicate internally by dialing extension numbers, streamlining communication within the organization.

External Communication: PBX systems connect with the public switched telephone network (PSTN) to facilitate communication with external parties, such as customers, clients, or partners.

Advanced Features: Modern PBX systems offer advanced telephony features like voicemail, call forwarding, conference calling, automated attendants, and more.

PBX systems have evolved from traditional hardware-based solutions to software-based and cloud-hosted solutions, offering greater flexibility, scalability, and cost-effectiveness.