Call Voice Clarity issue..

Hi folks

I have installed cm 12.1.1 Nightly -taoshan.

Everything working fine, but only issue with call quality. Noise cancellation is not working. Voice echoing on other side on any network. I have checked with every network provider, still facing same problem.

I have heard that disabling the " OK Google " may fix this issue... is that true.. ??

Folks help me out ...

Thanks....:)