What function does a PBX primarily serve?

A PBX, or Private Branch Exchange, primarily serves the function of connecting internal phone systems to the Public Switched Telephone Network (PSTN). This enables organizations to route calls between internal telephones and external phone lines efficiently. By doing this, a PBX allows for the management of multiple phone lines from a single interface, allowing users within the organization to make and receive calls through the same system while also providing features such as call forwarding, voice mail, and call routing.

This function significantly enhances the communication capabilities of a business while keeping costs lower compared to utilizing direct lines for each phone in the organization. It is essential in streamlining overall communication processes and ensuring that internal users can interact with external callers seamlessly.