docs: private void triggerTransportClosed(TransportCandidate cand) {
          List<JingleListener> listeners = getListenersList();
          for (JingleListener li : listeners) {
              if (li instanceof JingleTransportListener) {
                  JingleTransportListener mli = (JingleTransportListener) li;
                  mli.transportClosed(cand);
              }
          }
      }