Liberty Air 2 bad call quality

I’ve got a pair of Liberty Air 2 since last Xmas and I’m absolutely loving the playback audio quality.
When I got them I had expectation for the to be useful in phone calls and video conferencing. But since I start using them, there hasn’t been a single call where people didn’t complained that audio quality was bad and sounded heavily muffled.

Is this expected, can it be fixed through firmware updates?
Btw, I’m using latest firmware version.

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