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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.
Sprinttelco LLC
SPRINTtelco is leading the Voice over Internet Protocol (VoIP) revolution currently sweeping through the telecommunications industry. Virtually every major service provider is discovering the benefits of VoIP, and we are helping them leverage the technolo
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