About Windows Messenger's Audio port controlled through Gr..

Archived from groups: microsoft.public.windowsxp.messenger (More info?)

Server:LCS2005Enterprise+sp1
client: Windows Messenger5.1.0680

i installed lcs2005 at intranet,use TCP login, At intranet ,all user use
audio chat ok.
i publish lcs2005 to internet by ISA server 2004(publish TCP 5060 port).
now I can login from internet to Intranet successfullly.
Now we can chat by text.
I want use audio chat,I find microsoft artical
http://support.microsoft.com/default.aspx/kb/903056
so I open UDP 7100~7103 5350~5353 at ISA firewall , and then use Group
Policy registry setup client 's port range to UDP 7100~7103 5350~5353. then
i test IM from internet ,audio connnect session ok.but we cannot hear any
sound.
So I change ISA server access rule,open UDP 1024~65535, test again,Now audio
ok.


Group Policy registry has successfull setting MinMediaPort and MaxMediaPort
in my registry.

why i only open UDP 7100~7130 5350~5353 not useful? what does Group Policy
registry setting function?


thanks a lot.