docs: public synchronized void reject() {
          JingleSession session;
          synchronized (manager) {
              try {
                  session = manager.createIncomingJingleSession(this);
                  // Acknowledge the IQ reception
                  session.setSid(this.getSessionID());
                  // session.sendAck(this.getJingle());
                  session.updatePacketListener();
                  session.terminate("Declined");
              } catch (Exception e) {
                  LOGGER.log(Level.SEVERE, "Exception in reject", e);
              }
          }
       }