@Override
protected void doStart() throws Exception
{
if (_handler == null)
{
CallSessionHandler callSessionHandler = new CallSessionHandler();
SipSessionHandler sipSessionHandler = new SipSessionHandler();
TransactionManager transactionManager = ((Server) getServer()).getTransactionManager();
callSessionHandler.setHandler(transactionManager);
transactionManager.setHandler(sipSessionHandler);
_handler = callSessionHandler;
}