Makes sense. So in the case where I'm calling from iPhone 6 to iPhone 6
on Verizon, the gating factor sounds like whether we're both on LTE at
that moment in time. When it works, the audio quality is startling.
CB
On 4/21/17 11:27 AM, Scott Granados wrote:
I had a nice long detailed message for Chris on this topic and I crashed my
mail program.
You’re exactly right. To get more specific to his questions. Why does it work
sometimes and not others. Being a verizon user I can speak directly to this
because you’re using the network I helped build. When I talk of my time at
verizon it was working on the very thing you’re asking about among others. SO
here’s the drill as Janina correctly stated there are all different codecs that
support different qualities. The old phone network used 8KHz or 64K channels.
(56K of payload and 8 K of framing for old networks advanced to 64K channels
with only 8 K of framing for every 24 combined channels and so forth. More
recently everything on the phone networks are moving to data networks with IP
backbones. This means you don’t have fixed channel sizes any more and you can
use more data per call and we do. As mentioned there are really clean high
bandwidth audio specifications but the one we use tries to find a balance
between bandwidth usage and quality.
In verizon’s case, only LTE supports this new standard. When you’re on
3G with Verizon and you place a call your 3G session disconnects and you
establish an old 1X voice only channel. This channel supports at most about
128K which means you have enough head room for one 3 way call initiated form
the handset. When you’re on LTE and Voice over LTE is enabled you can leave
the LTE channel up and use that facility with a lot more bandwidth to carry the
call. This means we can have calls with 128, 384, 1024 and more K bandwidth.
Video calling is also included in the VOLTE spec so it’s possible to send voice
and data natively through the phone network not using FaceTime or Skype or some
other third party software.
Why does it work sometimes and not others? Could be several things.
In your case you need to both be on LTE if you’re placing a verizon to verizon
call. If you’re calling another network you your self need to be on LTE and
the far end carrier needs to not only support HD calling but needs to exchange
HD calls with Verizon. T-Mobile does this as an example so if you called a
T-Mobile customer and you’re on LTE you should get this quality audio.
Does it work between brands of phones? Yes, this is an open standard
so Android devices can talk to iPhones and both can talk to Microsoft phones if
the wide band calling is enabled on all accounts involved and all devices are
on the appropriate networks for HD calling.
Let me know if I can expand on anything further or if I’ve just confused
things. Glad to provide more info if needed.
Thank you
On Apr 21, 2017, at 11:13 AM, 'Janina Sajka' via MacVisionaries
<[email protected]> wrote:
Chris:
The old computer adage, "gigo" applies in answer to your question.
There are multiple codecs that can be used for telephony. Even the major
carriers have started using a higher quality codec when the equipment
supports it. You'll see this advertised as "HD Voice," by T-Mobile, for
instance.
The truth is that even "HD Voice" isn't the best available to be used,
but both ends of the call have to support the same codec (or better).
Else, down sampling and the resulting poorer quality results.
Like the adage says: garbage in, garbage out. And conversley, quality in
and maybe quality out.
hth
Janina
'Chris Blouch' via MacVisionaries writes:
I had always wondered what it was when I would call some people on my iPhone
6 and get surprisingly nice audio while other times it was just OK. So what
triggers the good audio? My wife and I have the same iPhone 6 on Verizon and
sometimes we get that amazing sound quality and sometimes it sounds just
like a regular cell phone. Does it depend on which tower you're connected to
or whether you're on LTE or not? A friend of mine is on Android and
sometimes I get really good quality calls with him as well, so it doesn't
seem to be an iPhone-specific thing.
CB
On 4/20/17 4:31 PM, Scott Granados wrote:
Cait, yes they do. I worked for a long time for Fidelity Investments where we
built a custom video and audio conferencing system. It replaced the one
Verizon offers. We actually took great care to have good quality audio along
with fantastic video. We supported from standard definition video up to 4K 30
FPS non drop and on the audio side everything was G722 wide band so you’d get
audio quality better than Skype calls in most settings. On the phone side we
supported G711 and G722 which means you either got something as good as a
standard phone call or if your phone supported it like many cell phones do we
would go wide band so again you’d get that nice crisp full audio.
The users liked it so much they scrapped the audio only conferencing
service and before we knew it we had 5+ million minutes of business per week.
We’d support thousands of parallel calls and were able to maintain crisp audio
so the other guys can if they want to expend the effort and use the extra
bandwidth.
On Apr 20, 2017, at 4:14 PM, Caitlyn Furness <[email protected]> wrote:
Lots of these webinar things have bad sound quality-and the more you have on
the lines, etc, the worse it seems to be!! Wonder if sighted people think the
quality is as bad as most of us probably do?!
Cait
On Apr 20, 2017, at 12:25 PM, Karen Lewellen <[email protected]> wrote:
I will add that zoom allows you to give participant's a call in number
instead, a fine option for those ho prefer attending without video at all.
Granted as is often the case when the audio is video based, the quality is sort
of nose crinkle worthy, but at least the door for phone alone is there.
Karen
On Thu, 20 Apr 2017, Kliphton Miller wrote:
I HAVE BEEN USING ZOOM FOR ABOUT A YEAR, IT IS MOSTLY ACCESSIBLE, JUST THAT
SOME OPTIONS THAT ARE available to the sited user, vo doesn’t read during a
conference, but it’s not a deal breaker.
On Apr 20, 2017, at 6:06 AM, Alex Hall <[email protected]> wrote:
Hi all,
I saw on Twitter yesterday that a new web conferencing service was discovered recently:
www.zoom.us <http://www.zoom.us/>. The big news here is that they have an accessibility
website (https://zoom.us/accessibility <https://zoom.us/accessibility>), an email address
([email protected] <mailto:[email protected]>), and a commitment to keeping their product
accessible. They claim compatibility with VoiceOver, Talkback, and NVDA, covering all the major
platforms.
I haven't tried the service at all, and am going off only what I read on their
website and in the article that pointed me to them in the first place. However,
things look good. If you're in need of this kine of service and you try Zoom,
I'd love to hear what you thought of the experience.
I haven't been following the Citrix thread, so I apologize if this was already
brought up over there.
--
Alex Hall
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