Here, this is the call recorder for all android mobile.
In this app, you will find some of the options or you can say configuration like,
You can select the file option of the recording like 3gpp, wav or AMR.
You can choose audio source from the options available between MIC, Voice uplink and Voice downlink.
So you can configure the app as per your requirement.
My Auto Call recorder
Call Recorder for free
Call recording app