Voice channels (FTTH, DOCSIS, VoLTE)

Luke Guillory lguillory at reservetele.com
Mon Nov 28 03:18:20 UTC 2016

With MGCP we're just using DSx Qos which is just services classification within the packet cable standard. Still runs over the same docsis network as all other traffic and not separated besides qos side of things.

We use a 64K reserved channel to set the call up, after that each call has its own service flow that is QOSed.

We also have reserved BW in the CMTS for 911 calls so that they always get through.

Where the modem resides in relation to 911 isn't really a factor as we go by services address for the account, a customer could moved the modem to another house across town and it will still work.

I know Time Warner has completely separate networks for voice and data, they didn't even reside on the same CMTS from what I understand. Don't know of anyone else doing it that way.


Sent from my iPhone

On Nov 27, 2016, at 8:49 PM, Jay R. Ashworth <jra at baylink.com<mailto:jra at baylink.com>> wrote:

Luke Guillory
Network Operations Manager

        [cid:image1f21cf.JPG at 56d24e46.43b1142f] <http://www.rtconline.com>

Tel:    985.536.1212
Fax:    985.536.0300
Email:  lguillory at reservetele.com
Web:    www.rtconline.com

        Reserve Telecommunications
100 RTC Dr
Reserve, LA 70084

The information transmitted, including attachments, is intended only for the person(s) or entity to which it is addressed and may contain confidential and/or privileged material which should not disseminate, distribute or be copied. Please notify Luke Guillory immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. Luke Guillory therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission.

----- Original Message -----
From: "Mikael Abrahamsson" <swmike at swm.pp.se<mailto:swmike at swm.pp.se>>
To: "Jean-Francois Mezei" <jfmezei_nanog at vaxination.ca<mailto:jfmezei_nanog at vaxination.ca>>
Cc: Nanog at nanog.org<mailto:Nanog at nanog.org>
Sent: Monday, November 21, 2016 2:53:41 AM
Subject: Re: Voice channels (FTTH, DOCSIS, VoLTE)

On Mon, 21 Nov 2016, Jean-Francois Mezei wrote:

I need to verify some claims made by incumbents in Canada that VoLTE
data travels on a totally separate channel between the phone and the

Typically it travels on another "bearer" compared to Internet traffic.


Think of bearers as "tunnels" between the mobile core network and the
device. They have a lot in common with ATM PVCs in that they can have
different QoS characteristics. So the VoLTE bearer can have scheduling
priorities that means it'll always be low-latency and highest priority,
meaning it might work well when the "Internet" bearer does not.

That is congruent with my understanding of how cableco voice is provisioned;
it has different rules WRT VoN -- specifically about 911 -- because the cable
company segregates it and handles it differently (your cablemodem is expected
to be tied to your service address -- or whatever terminal device does the

-- jra
Jay R. Ashworth                  Baylink                       jra at baylink.com<mailto:jra at baylink.com>
Designer                     The Things I Think                       RFC 2100
Ashworth & Associates       http://www.bcp38.info          2000 Land Rover DII
St Petersburg FL USA      BCP38: Ask For It By Name!           +1 727 647 1274

More information about the NANOG mailing list