code: public String getProperty(TrxMessageHeader trxMessageHeader, String strParamName)
      {
          String strProperty = (String)trxMessageHeader.get(strParamName);
          if (strProperty == null)
              strProperty = this.getProperty(strParamName);
          return strProperty;
      }
docs: Get this transport specific param.
  Get this param. The transport properties specify param names by adding the word
  param after it. For example, to specify a different param for the messageClass
  for a SOAP transport, the SOAP property messageClassParam=SOAPMessageClass should
  be set in the SOAP transport properties and the SOAPMessageClass should be set in
  the messageProperties so it knows which message class to use for SOAP messages.
  @param trxMessageHeader The message header to find a param in.
  @param strParam The param name.
  @return The parameter.