Cannot AV chat

Question

This is my second post on the same issue, I need some help. Again, my sister has a g4 ibook 1.42 ghz running 10.4.4, her boyfriend has a new intel iMac running 10.4.4, I have 1.8 ghz iMac G5 running 10.4.4. We can all video and audio chat as long as I start the call. They cannot call each other to video or audio chat. They can chat if they only type. We have checked and both have their firewall off, so what else could it be? Please advise, we are pretty much novices when it gets into ports and all those things, so as detailed of help as possible would be much appreciated.
Thanks!
Matt

Answer 1

FWIW: I am having the same problem, but with a specific user. I can video/audio chat w/my wife on her iMac, but in trying to chat with a co-worker (who bought using my former PB), we can text chat, but the audio and video attempts fail. The "call" goes through, but when it is "accepted," it briefly indicates that it is "connecting" (spinning cursor), and then gives each of us the same error message: "[sender/receiver name] did not accept the invitation."
I'm wireless via a router and cable, the other person has tried it both at his work network, and at home, wireless via a router. The fact that I can connect to my wife's network tells me it isn't a router issue (at least at my end).