- In build.prop add this two lines :

persist.call_recording.enabled=true
persist.call_recording.src=4


- In audio_policy.conf add AUDIO_DEVICE_IN_VOICE_CALL to this line near 61 :

devices AUDIO_DEVICE_IN_BUILTIN_MIC|AUDIO_DEVICE_IN_WIRED_HEADSET|AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET|AUDIO_DEVICE_IN_BACK_MIC|AUDIO_DEVICE_IN_VOICE_CALL|AUDIO_DEVICE_IN_FM_TUNER


- In mixer_paths.xml add the following lines :

	<path name="incall-rec-uplink">
		<ctl name="MultiMedia1 Mixer VOC_REC_UL" value="1" />
	</path>

	<path name="incall-rec-uplink bt-sco">
		<path name="incall-rec-uplink" />
	</path>

	<path name="incall-rec-uplink bt-sco-wb">
		<path name="incall-rec-uplink" />
	</path>

	<path name="incall-rec-uplink afe-proxy">
		<path name="incall-rec-uplink" />
	</path>

	<path name="incall-rec-uplink usb-headset-mic">
		<path name="incall-rec-uplink" />
	</path>

	<path name="incall-rec-downlink">
		<ctl name="MultiMedia1 Mixer VOC_REC_DL" value="1" />
	</path>

	<path name="incall-rec-downlink bt-sco">
		<path name="incall-rec-downlink" />
	</path>

	<path name="incall-rec-downlink bt-sco-wb">
		<path name="incall-rec-downlink" />
	</path>

	<path name="incall-rec-downlink afe-proxy">
		<path name="incall-rec-downlink" />
	</path>

	<path name="incall-rec-downlink usb-headset-mic">
		<path name="incall-rec-downlink" />
	</path>

	<path name="incall-rec-uplink-and-downlink">
		<path name="incall-rec-uplink" />
		<path name="incall-rec-downlink" />
	</path>

	<path name="incall-rec-uplink-and-downlink bt-sco">
		<path name="incall-rec-uplink-and-downlink" />
	</path>

	<path name="incall-rec-uplink-and-downlink bt-sco-wb">
		<path name="incall-rec-uplink-and-downlink" />
	</path>

	<path name="incall-rec-uplink-and-downlink afe-proxy">
		<path name="incall-rec-uplink-and-downlink" />
	</path>