code: public void creditGranted(long amount, boolean finalUnits) throws Exception {
  		if (CURRENT_STATE == SENT_INITIAL_RESERVATION) {
  			CURRENT_STATE = GRANTED_INITIAL_RESERVATION;
  			if (logger.isInfoEnabled()) {
  				logger.info("credit granted : ");
  			}
  			doInviteChargingAllowed(this.inviteRequest);
  		}
  	}
docs: Ro Client Listener Implementation