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Значения термина plain old telephone system на английском

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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        Использование термина plain old telephone system на английском
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        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