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         'Something went wrong with the networking, but it is not
          clear what the problem is, or the problem cannot be well
          expressed with any of the other provided detail codes.'

     ],

    ['X.4.1', 'No answer from host',

         'The outbound connection attempt was not answered, either
          because the remote system was busy, or otherwise unable to
          take a call.  This is useful only as a persistent transient
          error.'

     ],

    ['X.4.2', 'Bad connection',

         'The outbound connection was established, but was otherwise
          unable to complete the message transaction, either because
          of time-out, or inadequate connection quality. This is