about TURN MAGIC-COOKIE

"Toshihiro Sonoda" <[email protected]> Sun, 28 Nov 2004 12:19:07 +0900
Newsgroups gmane.ietf.midcom
Message-ID <00d201c4d4f9$05a34d70$0200a8c0@FM307599003>
Why can a server disambiguate a TURN Request from a data packet 
by looking for the MAGIC-COOKIE attribute, as described in Section 7.2.3.

Can it guarantee that UDP packets of non-TURN Packets doesn't 
have same value as MAGIC-COOKIE.