How to get rid of a weird pop up notification on Android?

[Android Central Question]

I am using Sony Xperia XA Ultra. And since few months, there is this one pop up notification that just makes a huge notification sound, and disappears. It has this speaker image on it, and that is all. (Notification Shows when Offline and Online)

It is highly annoying when I am on a call, and this comes and goes frequently. My ears pain just hearing this on the call. The call gets disturbed too.

Please, help.

 

[B. Diddy]

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