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Significados de plain old telephone system en inglés

Voice-grade analog telephone service; the basic form of residential and small business service connection to the telephone network now gradually replaced by more advanced forms of telephony such as ISDN, mobile phones and VoIP.

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        Uso de plain old telephone system en inglés
        1
        We brightened up a little when he explained that they were the " Plain Old Telephone System" and the "Pretty Advanced New System".
        The Irish Times