code: public int getExpires() {	
  		String expires = this.getParameter(EXPIRES_PARAM_NAME);
  		if(expires != null) { // This is how the TCK expects to parse it. See AddressingServlet in TCK spec tests.
  			return Integer.parseInt(expires);
  		} else { // I think this is not needed.
  			return ((SipURI)address.getURI()).getParameter(EXPIRES_PARAM_NAME) == null ? -1 : 
  				Integer.parseInt(((SipURI)address.getURI()).getParameter(EXPIRES_PARAM_NAME));
  		}
  	}
docs: /*
  (non-Javadoc)
  @see javax.servlet.sip.Address#getExpires()