PC videocam/MAC AIRPORT wireless interconnection; ports apparently blocked

We connect a PC (Windows XP Pro Service Pack 2) wirelessly to the Internet with Airport Extreme.
All connections work fine.
However, when we wish to (let's call it) video-conference with partners across the country, certain of our ports seem to be blocked. While we can dial out (using PolyCom software package) and connect. the far site can see us, but we can neither hear nor see them.
The far site (none of several) cannot connect us -- message: "No Network Service available." -- or the equivalent.
We have tried to forward the ports within the LAN: no soap.
We have connected directly to the modem vie Ethernet cable: nope.
Two firewalls have been turned off: "Windows XP Fireweall" and the firewall with Semantec AntiVirus.
To no avail. We have been told that there is an Apple firewall blocking some ports. Doesn't seem likely, as iChat/iSight connections work on the Apple computers on this network.
Ideas?
Thanks!!
Rick HAUSER
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MacBookPro 15" Mac OS X (10.4.7) Airport Extreme

Thanks for responding. I have now partially resolved the problem and will probably repost a new question for the remaing of my troubleshooting issues. To answer your question and help anyone else who may benefit from the information here is what I found out. My network consists of 5 computers; 2 wired MAC G4 desktops, a MAC iBook G4 laptop and 2 PC laptops. The AirPort Express is in client mode (i.e. meaning that it conects to a router via an Ethernet cable.) The router then connects to a cable modem and then to the internet. All the laptops use the AirPort Express to connect to the internet. The wired MAC laptops simply use the AirPort Express to stream AirTunes to a Bose Wave Station. I am not able to run either the Airport Step Utility or the Airport Admin Utility on the wired MACs (most likely because they don't have Airport Cards), but I can run those utility programs on the MAC and PC laptops. I used the MAC laptop to reconfigure the AirPort Express the way that I wanted and I am able to stream AirTunes to the AirPort Express. Everything works fine now except I can't use AirTunes with the wired MACs which I could do with the old router.
I have read the forums regarding issues with iTunes 7 and AirTunes and tried those solutions but nothing has worked so far. I guess that will be my next posted troubleshooting question.
Mac OS X (10.4.8)

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