code: public void init() {
          defaultApplicationRouterParser.init();
          try {
              defaultSipApplicationRouterInfos = defaultApplicationRouterParser.parse();
          } catch (ParseException e) {
              log.fatal("Impossible to parse the default application router configuration file", e);
              throw new IllegalArgumentException("Impossible to parse the default application router configuration file", e);
          }
      }
docs: load the configuration file as defined in appendix C of JSR289