Epabx intercom systems in Coimbatore
A private branch exchange (PBX) is a telephone exchange or telephone switching system that is installed at, and serves, a private organization with a large number of internal devices. When two devices inside the organization need to be connected, the switching to make this connection is done internaly by the private branch exchange. When an internal device needs to be connected to an external device, it connects to the external public switched telephone network. The number of lines from the organization to the public switched telephone network is greatly reduced, often by a factor of 10 or more
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