_sipFactory = (SipFactory) getServletContext().getAttribute(SipServlet.SIP_FACTORY);
_bindings = new HashMap<String, SortedSet<Binding>>();
getServletContext().setAttribute(Binding.class.getName(), _bindings);
_timer = new Timer();
_timer.scheduleAtFixedRate(new BindingScavenger(), 5000, 5000);
_dateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss z", Locale.US);
_dateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
}