I was about to reply to Josh with much the same comments... if the ultimate
device is an analog attached telephone then it is unnecessary and a
complete waste to bother with HD codecs.
But in saying that, in the last year I have upgraded the equipment in my
house from ATA connected devices to pure VoIP (I went with one Yealink T46G
and five W52P's) which I connect with g722 codec and the difference in
sound quality is noticeable... especially if you can keep everything in the
chain HD. But even going out to a VoIP trunk that uses uLaw/aLaw
ultimately to e.g. my iPhone using VoLTE the quality is noticeable
better... presumably because there is no analog signal anywhere in the
chain even though the digital signal is downsampled as it goes through the
trunk.
Anyone know of a VoIP trunk vendor that will support HD voice codecs... and
keep HD through its paths if the other end also supports HD?
David
On Sun, Apr 16, 2017 at 4:13 PM, Kristian Kielhofner <k...@kriskinc.com>
wrote:
> Hi Josh,
>
> The availability of Opus on an ATA is a little strange because
> virtually any analog POTS device you connect to it will undoubtedly
> have filters and/or other hardware limitations in place for the 300 -
> 3300Hz frequency range supported by the PSTN.
>
> To support frequencies beyond the usual ~3 KHz frequency range of
> the PSTN you need different audio hardware to support the increased
> frequency range represented in sample rates greater than 8KHz (8-48KHz
> being supported by the Opus codec itself).
>
> Polycom and other handset manufacturers that support "wideband
> audio" made very noticeable changes to the audio components (the
> speakers and microphones of the handsets, speakerphones, etc) used
> with their devices. Hardware like mobile devices, desktops, etc using
> Opus with Chrome/WebRTC/etc tend to best support frequency ranges up
> to 48KHz even though it's well beyond the "standard" 20-20,000Hz range
> of most audio components and human hearing.
>
> In short, it's unlikely you'll gain any noticeable improvement in
> audio quality by using Opus with an ATA and depending on the analog
> device itself you may actually have worse audio quality due to
> clipping and all kinds of other strange things that could happen when
> an analog device designed for the PSTN of the last 100 years is
> connected to something that can sample audio well beyond anything the
> audio hardware itself was designed for.
>
> Here's a fun site that tests the range your audio hardware can
> produce (and what your ears can hear):
>
> http://onlinetonegenerator.com/hearingtest.html
>
> I'm 33 years old and my hearing tops out at about 15 KHz but for now
> I'll make myself feel better by blaming my cheap computer speakers ;)!
>
> On Sun, Apr 16, 2017 at 2:51 PM, Josh <jma...@hotmail.com> wrote:
> > I had read that the Asterisk 13 config changes were likely to affect many
> > users, but that wasn't on my mind. Thanks for mentioning it!
> >
> >
> > Yeah, I'm not wild about the details of Opus either but it's the only
> way I
> > can use "HD" voice with the hardware I've got, so I figure I'll give it a
> > whirl pretty soon. I just bought some unlockable $10 Vonage-branded
> > Grandstream HT-802 ATAs which were too enticing to pass up! If you're
> > interested in messing with that, the details of the unlocking method are
> > available on page 2 of this thread:
> >
> >
> > https://www.dslreports.com/forum/r30988922-Unlock-New-
> Grandstream-ATA-used-by-Vonage-Unlocked
> >
> >
> > It requires a serial cable with 3.3V logic and actually didn't even
> require
> > soldering since you can easily stick individual pin headers in the three
> > appropriate holes (TX RX and GND). I'm comfortable with those methods so
> > the actual process took me about 5 minutes, but reading the entire thread
> > and digesting all of the information (which I've learned to do when
> > unlocking a device I don't want to accidentally brick) took considerably
> > longer.
> >
> >
> > Josh
> >
> > ________________________________
> > From: Lonnie Abelbeck <li...@lonnie.abelbeck.com>
> > Sent: Sunday, April 16, 2017 11:42 AM
> >
> > To: AstLinux Users Mailing List
> > Subject: Re: [Astlinux-users] Opus Codec Support
> >
> > Josh,
> >
> > To be clear, upgrading the base system to Asterisk 13 is easy, but you
> will
> > have to tweak your Asterisk configuration.
> >
> > This URL, at the end look for "Upgrade Note for Asterisk 11 -> 12" and
> > Upgrade Note for Asterisk 12 -> 13 ...
> >
> > Asterisk LTS Series Version
> > https://doc.astlinux-project.org/userdoc:tt_asterisk_upgrade_version
> >
> > If you built your own custom AstLinux image with Asterisk 13, you could
> add
> > to a finished build the proper downloaded binary blobs from Digium
> > "format_ogg_opus.so" and "codec_opus.so" to their proper location at
> > output/target/usr/lib/asterisk/modules/ and quickly rebuild with
> > ./scripts/build . Never tried it, those Opus binary blobs send shivers
> down
> > my spine. :-)
> >
> > Lonnie
> >
> >
> > On Apr 16, 2017, at 10:08 AM, Josh <jma...@hotmail.com> wrote:
> >
> >> Lonnie,
> >>
> >> Oops, I missed the previous discussion about Opus. Thanks for pointing
> me
> >> to it! I would really like to use Opus with Astlinux now that I have an
> >> HT802 ATA that supports it but not SILK (as well as people I call via
> SIP
> >> who use Opus). However, I was aware of the legal issues surrounding it
> so I
> >> had a hunch it might be a hassle to redistribute it with Astlinux. I
> guess
> >> I could roll my own Astlinux build with Opus support once you adopt
> 13.13
> >> (which I believe is the first build that includes Opus in menuselect),
> >> right?
> >>
> >> The upgrade to 13 looks easy. Thanks for confirming!
> >>
> >> Josh
> >>
> >> From: Lonnie Abelbeck <li...@lonnie.abelbeck.com>
> >> Sent: Sunday, April 16, 2017 9:05 AM
> >> To: AstLinux Users Mailing List
> >> Subject: Re: [Astlinux-users] Opus Codec Support
> >>
> >> Hi Josh, (comments inline)
> >>
> >> On Apr 15, 2017, at 9:46 PM, Josh <jma...@hotmail.com> wrote:
> >>
> >> > Hello,
> >> >
> >> > Does the current Asterisk 13 version of Astlinux support the Opus
> codec?
> >>
> >> No, Digium's Opus binary blob is not included, but the SILK CODEC is
> >> included.
> >>
> >> Here is a related mailing-list thread on the subject ...
> >>
> >> [Astlinux-users] Opus CODEC
> >>
> >> https://www.mail-archive.com/astlinux-users@lists.
> sourceforge.net/msg08638.html
> >>
> >>
> >> > Also, I'm currently running astlinux-1.2.8 i686 - Asterisk 11.23.1.
> If
> >> > I want to upgrade to version 13, can I just change my repository URL
> and do
> >> > a regular upgrade through the web GUI?
> >>
> >> Yes, exactly.
> >>
> >> Later, should you want to use Asterisk 11.25.1 instead, change your
> >> repository URL back to ast11, then System tab -> System Firmware
> Upgrade: [
> >> Revert to Previous ] then [ Upgrade with New ] and lastly Reboot/Restart
> >> System.
> >>
> >> Lonnie
> >>
> >>
> >>
> >> ------------------------------------------------------------
> ------------------
> >> Check out the vibrant tech community on one of the world's most
> >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> >> _______________________________________________
> >> Astlinux-users mailing list
> >> Astlinux-users@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/astlinux-users
> > Astlinux-users Info Page - SourceForge
> > lists.sourceforge.net
> > Welcome to the AstLinux users mailing list! To see the collection of
> prior
> > postings to the list, visit the Astlinux-users Archives. Using Astlinux
> ...
> >
> >> Astlinux-users Info Page - SourceForge
> >> lists.sourceforge.net
> >> Welcome to the AstLinux users mailing list! To see the collection of
> prior
> >> postings to the list, visit the Astlinux-users Archives. Using Astlinux
> ...
> >>
> >>
> >> Donations to support AstLinux are graciously accepted via PayPal to
> >> pay...@krisk.org.
> >>
> >> ------------------------------------------------------------
> ------------------
> >> Check out the vibrant tech community on one of the world's most
> >> engaging tech sites, Slashdot.org!
> >> http://sdm.link/slashdot_______________________________________________
> >> Astlinux-users mailing list
> >> Astlinux-users@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/astlinux-users
> > Astlinux-users Info Page - SourceForge
> > lists.sourceforge.net
> > Welcome to the AstLinux users mailing list! To see the collection of
> prior
> > postings to the list, visit the Astlinux-users Archives. Using Astlinux
> ...
> >
> >>
> >> Donations to support AstLinux are graciously accepted via PayPal to
> >> pay...@krisk.org.
> >
> >
> > ------------------------------------------------------------
> ------------------
> > Check out the vibrant tech community on one of the world's most
> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > _______________________________________________
> > Astlinux-users mailing list
> > Astlinux-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/astlinux-users
> > Astlinux-users Info Page - SourceForge
> > lists.sourceforge.net
> > Welcome to the AstLinux users mailing list! To see the collection of
> prior
> > postings to the list, visit the Astlinux-users Archives. Using Astlinux
> ...
> >
> >
> > Donations to support AstLinux are graciously accepted via PayPal to
> > pay...@krisk.org.
> >
> > ------------------------------------------------------------
> ------------------
> > Check out the vibrant tech community on one of the world's most
> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > _______________________________________________
> > Astlinux-users mailing list
> > Astlinux-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/astlinux-users
> >
> > Donations to support AstLinux are graciously accepted via PayPal to
> > pay...@krisk.org.
>
>
>
> --
> Kristian Kielhofner
>
> ------------------------------------------------------------
> ------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> Astlinux-users mailing list
> Astlinux-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/astlinux-users
>
> Donations to support AstLinux are graciously accepted via PayPal to
> pay...@krisk.org.
>
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