code: public void abort() {
      LOG.info("Aborting session driver");
      running = false;
      cmNotifier.clearCalls();
      cmNotifier.doShutdown();
      server.stop();
      incomingCallExecutor.interrupt();
    }
docs: For test purposes. Abort a sessiondriver without sending a sessionEnd()
  call to the CM. This allows testing for abnormal session termination