Post [Q] App to record call through line

Hello XDA!
This is my first thread here!

I've done lots of research to try and find an application that would record my calls, but all of the ones I found do that through the microphone.
I've already searched the Q&A section, google about it for three hours, ixquicked it for more three hours and nothing.

I just wanted an call recorder app that would record calls from the line.
I am always on the road, so mic recorded calls become a mess of noises.

I've also came to know that some kernels support it and some don't, I'm currently on Lupus kernel but I've also been using Doomkernel.
The custom rom I use is Xperia NXT Light Edition by Kris Dee.

Could anyone please shed some light over my issue?