What Is a PBX Machine?


A PBX (private branch exchange) machine is a telephone system that serves a particular business or organization. All telephones in the organization are wired to the PBX machine.


  • A PBX machine acts as a telephone switch. It connects company employees with one another, as well as with outside callers.


  • Each employee is assigned a three- or four-digit number that can be dialed so employees can to talk to one another.


  • To call outside the company, an employee dials an outside access code, which is usually just one number, before the office’s telephone number. The access code is usually the number nine.


  • PBX serves a particular company or organization, meaning that the system cannot be accessed or used by anyone except employees.


  • PBX is cost-effective and convenient because it eliminates the installation of individual phone lines for each employee of a company.

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