msn messenger - audio & video did not work with UPnP router

Dear,
I have some PC with Windows XP SP1 and latest hotfixes - UPnP Services
installed too.
I cannot establish audio and video connections with messenger 6.2
I did not work under the "administrator" user (but with admin rights). I
did not see UPnP devices with this user, but when I logged in with
"adminstrator" I see UPnP devices, what happens here?
What must I doo to establish audio and video? Gives there additional tools
for it?
I use some ZyXEL routers and firewalls with UPnP "ON" fore test this, ...
ZyWALL 50, ZyAIR G2000, Prestige 324, Prestige P653HWI, etc. .... and the
latest firmware too.

What is the difference between MSN messenger 6.2 and XP messenger 4.7
(latest?) or works the XP messenger 4.x better?

Are UPnP the big security hole as FBI and Cert tells?
http://www.updatexp.com/upnp.html
http://www.cert.org/advisories/CA-2001-37.html

fup2 microsoft.public.msn.messenger

--
Mit freundlichen Gruessen - Yours sincerely
Friedrich Stockhammer
http://www.stockhammer.at/