code: @Override
  	public void removeDialog(SIPDialog dialog) {
  		if (!sipCache.inLocalMode()) {
  			removeDialogFromDistributedCache(dialog.getDialogId());
  		}
  		super.removeDialog(dialog);
  	}
docs: /*
  (non-Javadoc)
  @see gov.nist.javax.sip.stack.SIPTransactionStack#removeDialog(gov.nist.javax.sip.stack.SIPDialog)