anchor.diff:           send_nok/1,
            send_eval/1,
            send_bad_answer/1,
  +         send_protocol_error/1,
            send_arbitrary/1,
            send_unknown/1,
            send_unknown_mandatory/1,
  
positive.code:          send_unsupported_app/1,
           send_error_bit/1,
           send_unsupported_version/1,
           send_long/1,
           send_nopeer/1,
           send_noapp/1,
  
negative.code: send_nok(Config) ->
      Req = ['ACR', {'Accounting-Record-Type', ?EVENT_RECORD},
                    {'Accounting-Record-Number', 0}],
  
      #'diameter_base_answer-message'{'Result-Code' = ?INVALID_AVP_BITS}
          = call(Config, Req).
  
  