STUN Nat traversal with windows messenger 5.1



Hi , We can already use windows messenger with any SIP account :

http://wiki.ekiga.org/index.php/Connecting_Windows_Messenger_5.1_to_ekiga.net

It's the last software MS has done that could fit to standards
etc ....

Anyway, is there any way to tel Windows messenger to use STUN or ICE
for nat traversal ? where to specify the stun server ?

I guess MS only implemented Upnp ?

.