Can't interact with sim800l module

Hi everyone,

Does anyone know if sim800l works proper with it's RX n TX pins directly connected to atmega's ones? If not, how could it be fixed with some voltage level converter?

Any help is highly appreciated

Solved my sim808 problem by soldering a wire to the gsm antenna "mount" and providing 9v 2amp power directly to the module using a DC adapter. It's either or both of the above problems.