Audio/video chat works but audio only doesn't

Audio-video chats (both 2-way and one-way) work, but audio ONLY chats don't work (connection error). One machine is running 10.4.2 and the other 10.3.9. Doesn't seem like this would be a firewall or bandwidth issue if AV chats are working fine. Why would this happen?

I have the same issue, as well as the other iChat issues on other posts. When our offices (SF area & LA area, CA, US) were on 10.3.9, no problems with audio or video chats (we all have AIM screen names). Then the boss upgraded to 10.4.1. He could a/v chat with anyone inside our network and could video (with sound) with the other office, but not audio only. When he is at home he could a/v with anyone. We upgraded one more computer in our office to 10.4.1 and it was able to audio chat to other Tiger machines outside the office, but not Panther machines (can chat with anyone inside too). Now the boss and I have upgraded these same machines to 10.4.2 and the audio chat doesn't work outside the office anymore and we still can't chat with Panther machines outside the office.
Our office has Netopia Cayman 3546-002 ADSL Broadband Gateway on SBC Yahoo DSL at 4936 kbps down/493 kbps up. I called Netopia and had them help me open up the ports (I had them look at the apple tech document so they could help me get it right). It has NAT enabled and all the computers on this LAN have static addresses. Most of the computers access the LAN through the airport express (which just bounces the signal from the wired side). I think we have port forwarding or mapping set up for our two servers...the router looks at the address from the WAN side and routes it to the address on the LAN side. Firmware is up to date on the router.
I did not originally set up this network and have spent much time reading the user manual for the modem/router (it's a combo device) and trying suggestions here and from Level 2 at Apple. They say it is our network, but I don't know how to fix it.
I don't think this router has any UPnP capability, that I could find in the manual. Also what is SIP? I need a description of it or at least what that acronym stands for. Also, I've seen stuff about using the Terminal to change the telenet port. This routers telenet is set to 23, that should be fine for iChat, right? No conflict?
Please help this tortured soul!! Thanks.

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