I am having a problem with on of my IP communicator users. She has cable internet and a Linksys WRT54G router. She can make a VPN connection and ping the CCM. The IP communicator, however, just sits on registering and never establishes a connection. If she bypasses the Linksys and connects her computer directly to the cable modem the IP Communicator works fine. What do I need to change on the Linksys to make it work? Any help will be greatly appreciated.