Alan,

You might try 
http://proxyfaq.networkgods.com/htmlFAQ/default.htm#_Toc476061353
which specifically deals with required ports and settings, that document is 
the best i've found for netmeeting/msproxy.



>
>I'm running a RH6.1 firewall/IP masquerader between a US West DSL 
>connection
>and a small LAN whose nodes run Windows NT and 98. When I run Microsoft Net
>meeting on either machine, I can connect to the other party, share files,
>and speak, but I can't hear what the other party is speaking to me through
>his mike. Since I get exactly the same failure on two machines running
>different versions of Windows and with different sound cards, I suspect 
>that
>my firewall is not passing the audio in my direction. My firewall is set up
>with the very simplest ipchains script at the moment, since I don't want to
>get fancy until all my apps work
>
>Is anyone else using NetMeeting through a Linux firewall?
>
>Alan Gore
>
>
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