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.
Red Telecom (Spain)
Based in South London, Red Telecommunications is a private limited company offering advanced communication solutions in a rapidly changing environment encompassing both traditional PSTN and new Internet technologies, for both the home and business user, w
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