code: public static Properties readInternalAndExternalConfiguration()
      {
          //read properties
          Properties properties=LibraryConfigurationLoader.readInternalConfiguration();
  
          ClassLoader classLoader=ReflectionHelper.getThreadContextClassLoader();
          InputStream inputStream=classLoader.getResourceAsStream(LibraryConfigurationLoader.CONFIGURATION_FILE_NAME);
          
          if(inputStream!=null)
          {
              LibraryConfigurationLoader.loadProperties(properties,inputStream,false);
          }
  
          return properties;
      }
docs: This function reads and returns the internal and external fax4j properties.
  
  @return  The internal and external fax4j.properties data