How to enable Voice calls on Tab 4 10.1 T537A AT&T topic

Experts need your help please. I bought Samsung Tab 4 10.1 LTE (Model T537A AT&T) recently. I would like to enable the voice calls on this sim based tab.

I read T535 model is having voice call enabled. Is it fine if I flash that firmware to my tab :(

Could you please help me pointing to any info on how to get it. I searched for this and saw a thread for old Tab but not for this model.

Thanks in advance for your time.

-KP