code: public void setPhoneNumber(String number) {
  		String phoneNumber = number;
  		if(number.startsWith("+")) {			
  			phoneNumber = phoneNumber.substring(1);
  		}
  		try {
  			basePhoneNumber(phoneNumber);		
  			telUrl.setPhoneNumber(phoneNumber);
  		} catch (ParseException ex) {
  			logger.error("Error setting phone number " + number);
  			throw new java.lang.IllegalArgumentException("phone number " + number + " is invalid", ex);
  		}
  	}
docs: /*
  (non-Javadoc)
  @see javax.servlet.sip.TelURL#setPhoneNumber(java.lang.String)