Technical roles of a PBX System

PBX stands for Private Branch Exchange, which is a private telephone network used within a company. The users of the PBX phone system share a number of outside lines for making external phone calls. PBX phone systems are usually much more flexible than proprietary systems, as they are using open standards and interfaces. Modern PBX phone systems are based on standard hardware, which is cheaper and can easier be replaced than a closed systems.

The main technical roles of a PBX are:

• To switch between telephone users thereby creating connections
• To make sure the connection remains in place properly by keeping its resources
• To properly end the connection when a user hangs up
• To record the quantities, statistics and metering related to the calls

A PBX connects the internal telephones within a business and also connects them to the public switched telephone network. A PBX also allows you to have more phones than physical phone lines (PTSN) and allows free calls between users. It also provides features like transfers, voicemail, call recording, interactive voice menus (IVRs) and ACD call queues. In some situations, alternatives to a PBX include centrex service (in which a pool of lines are rented at the phone company’s central office), key telephone systems, and, for very small enterprises, primary rate Integrated Services Digital Network.

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