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.
TalkNet is an Australian-owned wholesale provider of end-to end, business-grade Voice-over Internet Protocol (VoIP) telephony services. The TalkNet service enables ISPs, PABX and network integrators, consultants, and other retail channel partners to offer
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