How Do I set vidoe conference with Asterisk?

Hello, Guys:
I tested the asterisk 1.4 with grandstream video phone. it works perfectly. Now I want to set an environemnt for video conference. How do i set dialplan and other configures. Any asterisk guy knows that? please give me a hint for this solution!

In Its raw state , you cant. There are apps out there that can, either based on app_conference or i hav seen one based on meetme.

Have a google.