Problem with checkHeaders method of SIPResponse

The problem is: it will throw an exception in any case for 100 response.

If 'Trying' response DOES NOT have 'To' header

		if (getTo() == null) {
			throw new ParseException(To.NAME+ " Is missing ", 0);
		}

If 'Trying' response DOES have To header

//		 Check for badly formatted message.
		if (getStatusCode() == 100
				&& getToTag() != null) {
			throw new ParseException(
					"Trying response should not have a To 
header tag parameter",0);
		}

I think it should be something like this

		if (getStatusCode() != 100 && getTo() == null) {
			throw new ParseException(To.NAME+ " Is missing ", 0);
		}