RADIUS attribute from rfc2866

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Acct-Output-Octets

This attribute indicates how many octets have been sent to the
      port in the course of delivering this service, and can only be
      present in Accounting-Request records where the Acct-Status-Type
      is set to Stop.

   A summary of the Acct-Output-Octets attribute format is shown below.
   The fields are transmitted from left to right.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |    Length     |             Value
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Value (cont)         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      43 for Acct-Output-Octets.

   Length

      6

   Value

      The Value field is four octets.

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