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voip phone system A private branch exchange or simply PBX, is a network, telecommunication network, used by businesses, for a very long time, to communicate. Private branch exchange uses analogue technology originally. Analogue technology means using continuous analogue signals to transfer the voice signal from one part to another. The analogue system is slow and primitive, thus, making Private branch exchange an outdated option. In Private branch exchange systems, usually, copper landlines are wired together. This makes the system bulkier and irritating- as, a lot of phones ringing together cause disturbance and noise pollution. So, usage of Private branch exchange has reduced drastically.