PBX (Private Branch Exchange) is a small telephone switch that is used to establish connections among the internal telephones of a private organization. PBX reduces the overall cost of telephony in a company by reducing the total number of telephone lines they need to lease from the telephone company. Without a PBX a company needs to lease one telephone line for every employee with a telephone. The company only needs to lease as many lines from the telephone company as the telephone company as maximum number of employees that will be making outside calls at one time. It is nearly 10% of the number of extensions. In a PBX system, every telephone is wired to the PBX. When an employee takes the receiver off hook and dials the outside access code, the PBX connects the employee to an outside line. The enterprise-class PBX including directory-based voicemail, conference calling, integrated messaging, interactive voice response (IVR), three-way calling, caller ID, and call queues. T
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