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.
SMS Roaming
SMSRoaming is a mobile messaging specialist providing professional solutions to clients from the corporate and public sectors, mobile operators, aggregators, resellers and others, giving them a new communication medium and new added value.
Founded as a
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