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1.Overview Analog phonesystem – also commonly known as Plain Old Telephone Service (POTS) – that carries voice signals over copper wires . VoIP technology transmits voice traffic over Internet in the form of data packets . 2.Phone cost Analog telephone cheaper than voip telephone 3.System cost Analog:In addition to the PBX host and external line cards, a large number…

Nowadays, we may use elevators wherever we go, such as office buildings, hospitals, shopping malls, schools, residential quarters, etc. In the elevator, the floor buttons of the elevator are usually used, and the emergency calls in the elevator are often ignored and do not know how to use them. However, there is often no signal…