Source : Free On-Line Dictionary of Computing

Post, Telephone and Telegraph administration
     
         (PTT) One of the many national
        bodies responsible for providing communications services in a
        particular country.  Traditionally, PTTs had monopolies in
        their respective countries.  This monopoly was first broken in
        the USA, with the UK joining somewhat later.  Currently the
        markets are being deregulated in Europe as well as other parts
        of the world.
     
        Well-known PTTs include {MCI}, {AT&T}, and {British Telecom}.
     
        Compare: {telco}.
     
        (1998-05-18)