Voice channels (FTTH, DOCSIS, VoLTE)

Jay R. Ashworth jra at baylink.com
Mon Nov 28 02:47:17 UTC 2016

----- Original Message -----
> From: "Mikael Abrahamsson" <swmike at swm.pp.se>
> To: "Jean-Francois Mezei" <jfmezei_nanog at vaxination.ca>
> Cc: 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
>> antenna.
> Typically it travels on another "bearer" compared to Internet traffic.
> http://blog.3g4g.co.uk/2013/08/volte-bearers.html
> 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
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

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