@Override
  public RequestDispatcher getNamedDispatcher(String name) {
    // Validate the name argument
    if (name == null) return (null);

    // Create and return a corresponding request dispatcher
    MobicentsSipServlet servlet = sipContext.findSipServletByName(name);

    if (servlet == null) return context.getNamedDispatcher(name);
    // return (null);

    if (servlet instanceof SipServletImpl) {
      return new SipRequestDispatcher((SipServletImpl) servlet);
    } else {
      return context.getNamedDispatcher(name);
    }
  }