A little help please !

I have 2 XP pro boxes that can use messenger 6 behind the
firewall just fine.

When I try to voice call a third party outside the
firewall we can chat ok but no voice conference.

I use proxy server 2.0 as the firewall.

I have looked at the packet filters and I think that I
need a UDP filter for 5k to 65k but I am not sure how to
create it.

Any help in this area would be greatly appreciated.
Thanks for your time


Sincerely

Dr.P

I have installed the msp client with no luck getting thru
the proxy either.