docs: public void startSweep()
      {
          PeerMonitor.logger.debug("Starting channel mark and sweep"); //$NON-NLS-1$
  
          // Mark every channel as 'clearing'
          synchronized (PeerMonitor.class)
          {
              for (final Peer peer : this.peerList)
              {
                  peer.startSweep();
              }
          }
  
          /**
           * Request Asterisk to send us a status update for every channel.
           */
          final StatusAction sa = new StatusAction();
          try
          {
              AsteriskPBX pbx = (AsteriskPBX) PBXFactory.getActivePBX();
              pbx.sendAction(sa, 5000);
          }
          catch (final Exception e)
          {
              PeerMonitor.logger.error(e, e);
          }
  
      }