msn and MS netmiiting requiers special h.323 proxy. There are programs witch provide this. One of them is open gatekeeper.
there is some talk about h.323 programs in the faq pages (if i remember correctly). The address of this is opengatekeeper.org .
The only program is that i havent found this program in rpm format.
If you know how to install it from a tarball, then go ahead (if possible give me detailed instructions on this package)
Please try searching it yourself too, if you manage to locate it, please put up a link for me.
Hope this helps
Sander