Intercom Paging
Some telephones, depending on the brand and model, have the intercom function, which allows to begin communication by sending the signal. When the signal comes, the telephone set rings a signal different from the standard ring tone call. After that the telephone temporarily switches off from the telephone line and works as an intercom.
Introduction
With a traditional PBX system, or private branch exchange, everything is done over live phone lines. Stations are utilized to route and reroute phone calls in order to allow a caller to reach the party they want to talk to. While this is a perfectly acceptable method of doing business, as technology grows, so do the incentives for upgrading to newer business telephone systems.
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