How can I make a 3G-324M video call?
As of now I don't know of any Android phone capable of establishing 3G-324M Video calls. Android have some parts of 3G-324M implemented in the communications stack, but is far from being complete.

All the android phones that can make “video calls” use Internet.

Given the fact that carriers charge an “extra” for a video call using 3G-324M and that any internet traffic is probably included in your data plan, Android will probably continue to go the way of internet video calls, not 3G-324M.