[ale] Rant

[Jim Kinney]

Good explanation! Thanks, Scott.

On July 13, 2022 5:22:25 PM MST, Scott Plante via Ale <ale at ale.org> wrote:
>It refers to HD Voice. Way back in the early days of telephone
>switching,
>they developed a very basic audio compression known as alaw or ulaw.
>It's
>not bad for the narrow range of frequencies used by spoken voices, but
>nothing like what we are used to today for non-telephone audio. For a
>long
>time PBXs and phones didn't worry about better quality because it was
>going
>to go through one or more phone companies that would downgrade the
>compression to ulaw anyway (alaw was almost the same, but used in
>Europe).
>With the advent of VoIP we began to have a decent likelihood of a call
>never going over old POTS (plain old telephone service) anywhere in
>between
>and IP desk phones started offering what became known as "HD Voice". It
>has
>a wider frequency range and takes advantage of much better compression
>algorithms (e.g. G.722). Not too many years later, cell phone
>manufacturers
>and service providers began offering it too. It remains true that it's
>only
>useful if your whole call bypasses POTS--it could be cellphone to
>cellphone, or VoIP to VoIP, or other configurations but both ends and
>everything along the way have to support it. It's still not going to be
>the
>quality of your high-end music setup, but it's much better than
>traditional
>telephone service. Of course you're still at the mercy of the
>microphone
>and speaker on both ends too, like you are listening to a high quality
>recording on crappy earbuds, for example. This is all from memory, but
>we've been using HD Voice with Asterisk PBXs and Polycom phones for
>many
>years now. If you Google "HD Voice" you'll find a lot of resources.
>
>On Thu, Jun 30, 2022 at 11:27 AM Boris Borisov via Ale <ale at ale.org>
>wrote:
>
>> On my Verizon phone when I make phone call there is little HD sign
>next to
>> keypad.
>>
>> Do they want me to believe that I'm listening to the other voice in
>Hi-Fi.
>>
>>
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