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.
Founded in 2001, Green path Technologies Co.,LTD. is one of the fastest developing companines in today`s Information Technology industry. We begun our business with the mission to deliver excellent VoIP infrastructure to inhabitants and entrepreneurs, sim
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