PBX (Private Branch Exchange) 1
PBX (Private Branch Exchange) 1 :
(ICT) (TEL, HE) A telephone switch (also known as a PABX, or private automatic branch exchange) located on a customer's premises that primarily establishes voice-grade circuits over tie lines to a telephone company central office (CO) between individual users and the public switched telephone network. The PBX also provides switching within the customer premises local area, and usually offers numerous enhanced features, including least-cost routing and call detail recording
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