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.
Started in 2003, with an aim to provide best-in-class VoIP solutions, today REVE Systems holds leadership position in Mobile VoIP solutions, with its flagship product iTel Mobile Dialer Express being used across 1200+ switches, in more than 50 countries a
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