@Daniel1650 The overall quality of voice depends on the Internet speed the device from recording and also the device reciving somtimes when the internet is low it reduce to the low level that is where you having isssue with quality.
Many thanks for the answer. @Deleted This is obvious, but unfortunately I cannot confirm this. I tested this voice message under various circumstances and i always came to this result. The internet speed on the Android devices wasn't better, but always led to the better result. Maybe there are other factors?