code: public static void disablePresence(String url, Boolean isCluster,
  			String applicationKey, String privateKey, String channel,
  			OnDisablePresence callback) {
  		Presence.disablePresence(url, isCluster, applicationKey, privateKey,
  				channel, callback);
  	}
docs: Disables presence for the specified channel.
  
  <pre>
  Ortc.disablePresence(&quot;http://ortc-developers.realtime.co/server/2.1/&quot;, true,
  &quot;APPLICATION_KEY&quot;, &quot;PRIVATE_KEY&quot;, &quot;CHANNEL&quot;, new onDisablePresence() {
  
  public void run(Exception error, String result) {
  if (error != null) {
  System.out.println(error.getMessage());
  } else {
  System.out.println(result);
  
  }
  }
  });
  </pre>
  
  @param url
  Server containing the presence service.
  @param isCluster
  Specifies if url is cluster.
  @param applicationKey
  Application key with access to presence service.
  @param privateKey
  The private key provided when the ORTC service is purchased.
  @param channel
  Channel to disable presence
  @param callback
  Callback with error and result.