anchor.diff:  %% only the return value from the prepare_request callback being
   %% significant.
   send_anything(Config) ->
  -    ['STA', _SessionId, {'Result-Code', ?SUCCESS} | _]
  +    ['STA', {'Session-Id', _}, {'Result-Code', ?SUCCESS} | _]
           = call(Config, anything).
   
   %% ===========================================================================
  
positive.code:         = group(Config),
      Req = ['STR', {'Termination-Cause', ?LOGOUT},
                    {'Destination-Host', [?HOST(SN, ?REALM)]}],
      ['STA', _SessionId, {'Result-Code', ?SUCCESS} | _]
          = call(Config, Req, [{filter, {all, [host, realm]}}]).
  send_destination_2(Config) ->
      Req = ['STR', {'Termination-Cause', ?LOGOUT}],
      ['STA', _SessionId, {'Result-Code', ?SUCCESS} | _]
          = call(Config, Req, [{filter, {all, [host, realm]}}]).
  
  %% Send with filtering on and expect failure when specifying an
  
negative.code:     Req = ['ACR', {'Accounting-Record-Type', ?EVENT_RECORD},
                    {'Accounting-Record-Number', 1}],
  
      ['ACA', {'Session-Id', _}, {'Result-Code', ?SUCCESS} | _]
          = call(Config, Req).
  
  %% Send an accounting ACR that the server answers badly to.
  