code: public void sendAck(Request arg0) throws SipException {
  		if (tracer.isInfoEnabled()) {
  			tracer.info(this+" sending ACK:\n"+arg0);
  		}
  		wrappedDialog.sendAck(arg0);
  	}
docs: /*
  (non-Javadoc)
  @see javax.sip.Dialog#sendAck(javax.sip.message.Request)