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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.
Minute exchange.com
Minute Exchange has been serving the Telecommunications community since 2003. We specialize in Wholesale Minutes, VoIP Interconnection, Inbound Services and Switch Partitions as well as many other telecommunications services.
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