this.transactionPointer = null;
retval.transactionPointer = null;
	public Object clone() {		SIPRequest retval = (SIPRequest) super.clone();		// Do not copy over the tx pointer -- this is only for internal tracking.		this.transactionPointer = null;		if (this.requestLine != null)			retval.requestLine = (RequestLine) this.requestLine.clone();				return retval;	}