A Private Branch Exchange (PBX) is typically found in residential dwelling especially single-family homes.

Name: A Private Branch Exchange (PBX) is typically found in residential dwelling especially single-family homes.
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A PBX is typically found in a business or enterprise setting, not in residential dwellings. In a residential setting, a smaller version of a PBX called a key telephone system (KTS) or a Private Branch eXchange (PBX) can be used.

A Private Branch Exchange (PBX) Is Typically Found in Residential