code: @Override
  	public void getBindingsResult(int resultCode,
  			List<RegistrationBinding> bindings) {
  		ServerTransaction serverTransaction = getRegisterTransactionToReply();
  		if (serverTransaction == null) {
  			tracer.warning("failed to find SIP server tx to send response");
  			return;
  		}
  		try {
  			if (resultCode < 300) {
  				sendRegisterSuccessResponse(resultCode, bindings,
  						serverTransaction);
  			} else {
  				sendErrorResponse(resultCode, serverTransaction);
  			}
  		} catch (Exception e) {
  			tracer.severe("failed to send SIP response", e);
  		}
  	}
docs: call backs from data source child sbb