Have done it with T1 PRI and CAS. I had 4.01 and it didnt show the module in gateway configuration page. I had to upgrade to 4.01SR2 to make it work. Since you have 4.02, I think it should be already supported..
Also remember to give "cart type e1" command to make those onboard ports type E1.
You might end up having issues with MGCP and the module depending on what IOS you run. I think the latest now is 12.3.11T thats supported.