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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.
SoTel Systems LLC
SoTel Systems, LLC is to be the industry leader at providing profitable, customer service-focused and agile business communications solutions through a dedicated and empowered workforce. the premier wholesale supplier for business communications products
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