[lxgr]

Very good point – the "landline generation's" ears have aged considerably since the 90s.

On top of that, I think many remember "landline quality" in terms of a relative comparison with potato-quality early mobile phone codecs, analog mobile phones, heavily compressed discounted long-distance calling circuits etc. of the time.

Yes, landlines were better than any of that, but it doesn't mean that they were actually good by today's standards.

[cies]

> by today's standards.

Which? Whatsapp call sound shit. Mobile phone calls sound shit.

I did Mumble to get some acceptable quality.

[lxgr]

> Whatsapp call sound shit.

Not for me; it's way better than any landline I've ever used.

Not sure what we're doing differently – are you sure it's not your or the other party's speaker or microphone?

> Mobile phone calls sound shit.

Not for me either, at least not when EVS ("HD voice") is used, which is more often than not these days when calling friends/family.

2G connections used to sound quite bad, but since 4G, the limiting factor for me has been the other side being on a landline (mostly for business calls), which usually doesn't support wideband audio.

[vel0city]

WhatsApp uses opus for its voice functionality.

The default codec configuration for Mumble is opus.