> Unfortunately, as of 2019, the quality of voice transmission via Bluetooth is still poor, and it is not clear why Bluetooth SIG is not doing anything about it

> Unfortunately, as of 2019, the quality of voice transmission via Bluetooth is still poor, and it is not clear why Bluetooth SIG is not doing anything about it. I would speculate there is no party with a strong interest in voice only communications participating in the Bluetooth SIG. That's because the biggest industry group for voice only communications has its own wireless standard, DECT. I've been trying to find a way to pair bluetooth hearing aids with a DECT landline phone but as far as I can see, no landline phone manufacturer has implemented Bluetooth Hands Free Protocol to work with hearing aids. This surprised me. My 89 year old mother's hearing aids can pair with iPhone and Android, but she doesn't use a mobile device so I need it to pair with an ordinary DECT landline phone. I understand both landlines and old people are declining markets. Anyway, to confirm this blank I had to peruse a lot of DECT and Bluetooth standards. Bluetooth Profile Specifications and compliance therewith are a rabbit hole, difficult to navigate because DECT phone device manufacturers don't publish capabilities.