collison Test in UDK

Create a box in 3ds Max name it UCX_ECHO make however big you want the collison.
Name the collison object the same name UCX_blah blah

Group the box and the wall together

Import into UDK
Combine meshes

Double click on click on collison tab the first one.
click on collision button


Save it and press play and the collison should work.

Test of working collision