Yeah… With latest Tytung r9 beta kernel, you can record phone call conversation now (2-way in call recording). Currently, there are 3 NAND Android ROMs that I tried which is using Tytung r9 beta kernel. And I managed to record my calls with BOYPPC-SHIFTPDA GINGER HoneyComB. Besides Tytung r9 beta kernel, all you need is a call recorder application by XDA Developer, skvalex.
By the way, you don’t need to enable speakerphone to record calls. It works fine on normal phone call but your own voice is little bit soft when playback. However, the incoming voice is loud and clear. That’s the important part, right?
Download CallRecorder for Android here.