I'm confused... the Galaxy Tab commercials make a special point of showing people doing video conferencing on the device, and yet, I have been entirely unable to evoke said functionality from the one I have in my hands here (it's with Verizon)... So... what gives?!
How are you "evoking" this functionality? Video conferences do no appear from the ether. Try a video conferencing app, perhaps -- like Qik, Fring, or Yahoo! Messenger.
There have been reported problems with qik on the galaxy tab, particularly no option to start a chat. Try to download something from vcast apps or try oovoo. Sorry for not giving any links but I'm on my droid and my latest CM update is acting crazy closing my browser w/o warning.