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EXTERNAL USB MICROPHONE OVER VOICE CALL

Hello,

Task to achieve:
An External USB Microphone should work while ongoing voice call.


I have tested following phones:
1) Micromax Canvas Spark (CyanogenMod 12.1 i.e Android 5.1.1)
2) Redmi Note 4 (Lineage OS 15.1 i.e Android 8.1.0)
3) Redmi Note 4 (MIUI Android 7.0)
4) Samsung J7 PRIME 2 (Android 7.0)

Observation:
Above devices does not take input from external mic during voice call, though third party apps can access the USB microphone.

Few Questions:
1) Can any one explain why external USB microphone is not accepted during call ?

2) Can it be possible to achieve my task using root permissions and modifying kernel / system files ?

3) If it is possible via modifying then where i have to make those changes ?

Study References:
https://source.android.com/devices/audio/usb
 

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