Volume doesn't decrease while on a call

I have noticed this wiered thing on my phone, if I am on a call and would like to decease the volume using volume keys, it will remain as is.

Volume doesn't decrease while on a call

user1506724542819 user1506724542819
 /  edited October 2017
I have noticed this wiered thing on my phone, if I am on a call and would like to decease the volume using volume keys, it will remain as is.

Is this a known issue or happening only with my device.
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