code: public void setValue(String value) {
  		try {
  			this.telUrl = SipFactoryImpl.addressFactory.createTelURL(value);
  		} catch (ParseException ex) {
  			throw new IllegalArgumentException("Bad url string " + value);
  		}
  	}
docs: /*
  (non-Javadoc)
  @see javax.servlet.sip.Parameterable#setValue(java.lang.String)