Android how to make video chat between two devices?

I am trying to develop an example video chat application in android. I have looked at example projects like sipdroid "," Tango "that works with sipserver support . But I don't want to develop with sipserver support.
I want to develop a sample application, such as" Fring "android application. How to do ?? please provide me some recommendations. I hope for a good answer. Thanks in advance.