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.
Accatel, Inc
Accatel provides wholesale and retail traffic and solutions to carriers, enterprise, and individuals` worldwide. Accatel`s customers are carriers who resell Accatel`s high quality, low cost minutes to their own residential and business customers; as well
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