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.
Advantage Century Telecommunication Corporation, established in 1998, is a leading VoIP solution provider for customer premises equipment with headquarter in Taipei. We specialize and focus on design, R&D, manufacturing, marketing and sales as well as OEM
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