CharacterController not entering in OnCollisionEnter functions

Hi Im trying to get the collision information but it seems like that CharacterController gameObejct is not entering any of OnCollision functions.
Anyone else has faced this problem before??
Plz guide…

Thanks

Make sure you have proper settings on those colliding object. May be you don’t have RB in any of the object or something. Check out the following url and make sure you understand the collision matrix

http://docs.unity3d.com/Documentation/Components/class-BoxCollider.html