code: @SuppressWarnings("serial")
  	public void join(final Conference conference) {
  		join(conference, Direction.DUPLEX);
  		try {
  			Thread.sleep(800);
  			mg.getPlayer().play(URI.create(url), null, null);
  		} catch (Exception e) {
  			logger.error("Error", e);
  		}
  	}
docs: /* (non-Javadoc)
  @see org.mobicents.servlet.sip.conference.ConferenceLeg#join(org.mobicents.servlet.sip.conference.Conference)