Issue with Mediarecorder for opponent sound without earphone

I have written my code for call recording. I m testing on Nexus 5 and found very wired output. When I am testing with earphone plugged in, the voice of both parties i.e. caller and opponent are clearly recorded but when I m calling without earphone plugged in, the only voice of caller is recorded. I have used Audiosource as Mic and entire code is same in both cases. Any one can help me in this.

I just retested my code and realized that even setting audio source as Default is giving the same...

Issue with Mediarecorder for opponent sound without earphone

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