I have no idea whether this will help or not but I'd had problems getting video iChat to work with my new ISP-provided Speedtouch 716 router.
It turned out that the ISP had provided an iChat 'template' to help it work and suddenly ta da. What did it in their template even after opening the ports was setting a TCP port trigger of 4099
It turned out that the ISP had provided an iChat 'template' to help it work and suddenly ta da. What did it in their template even after opening the ports was setting a TCP port trigger of 4099