nanog mailing list archives
Re: What vexes VoIP users?
From: Michael Thomas <mike () mtcc com>
Date: Tue, 01 Mar 2011 06:53:49 -0800
On 03/01/2011 05:51 AM, Jay Ashworth wrote:
----- Original Message -----From: "William Pitcock"<nenolod () systeminplace net>That is the same market Vonage is now targeting in the US, basically. National calling in the US is basically bundled with most calling plans now. I'm not convinced that many people use Vonage in the US - my experience with it was that it was not as reliable as the VOIP products offered through the various broadband providers I have had.Let us be clear: if you're getting "digital telephone" service from a cable television provider, it is *not* "VoIP", in the usage in which most speakers mean that term -- "Voice Over Internet" is what they should be saying, and cable-phone isn't that; the voice traffic rides over a separate DOCSiS channel, protected from both the Internet and CATV traffic on the link.
Er, I'm not sure what the difference you're trying to make. Is IP running over an L2 with a SLA any less "IP" than one without a SLA? That's all the DOCSIS qos is: dynamically creating/tearing down enhanced L2 qos channels for rtp to run over. It's been quite a while since I've been involved, but what we were working on with CableLabs certainly was VoIP in every respect I can think of. | As I recall, this questionably fair competitive advantage has been
looked into by ... someone. (Cablecos won't permit competing VoIP services to utilize this protected channel, somewhere between "generally" and "ever".)
There's is a great deal of overhead involved with the booking of resources for enhanced qos -- one big problem is that it adds quite a bit of latency to call set up. I'm sceptical at this point that it makes much difference for voice quality since voice traffic is such a tiny proportion of traffic in general -- a lot has changed in the last 15 years. Now video... I'm willing to believe that that enhanced qos still makes a difference there, but with youtube, netflix, etc, etc the genie isn't getting back in that bottle any time soon. So Moore's law is likely to have the final word there too making all of the docsis qos stuff ultimately irrelevant. Mike
Current thread:
- RE: What vexes VoIP users?, (continued)
- RE: What vexes VoIP users? Frank Bulk (Mar 01)
- Re: What vexes VoIP users? Scott Helms (Mar 02)
- RE: What vexes VoIP users? Frank Bulk (Mar 02)
- Re: What vexes VoIP users? Scott Helms (Mar 02)
- RE: What vexes VoIP users? Frank Bulk (Mar 02)
- Re: What vexes VoIP users? Scott Helms (Mar 02)
- Re: What vexes VoIP users? Valdis . Kletnieks (Mar 02)
- Re: What vexes VoIP users? Scott Helms (Mar 02)
- RE: What vexes VoIP users? Frank Bulk (Mar 02)
- Re: What vexes VoIP users? Jay Ashworth (Mar 02)
- Re: What vexes VoIP users? Michael Thomas (Mar 01)
- Re: What vexes VoIP users? Jay Ashworth (Mar 01)
- Re: What vexes VoIP users? Bret Palsson (Mar 01)
- Re: What vexes VoIP users? Jay Ashworth (Mar 01)
- Re: What vexes VoIP users? Michael Thomas (Mar 01)
- Re: What vexes VoIP users? Bret Palsson (Mar 01)
- Re: What vexes VoIP users? Owen DeLong (Mar 01)
- Re: What vexes VoIP users? Michael Thomas (Mar 02)
- RE: What vexes VoIP users? Nathan Eisenberg (Mar 01)
- Re: What vexes VoIP users? Jay Ashworth (Mar 01)
- Re: What vexes VoIP users? Bret Palsson (Mar 01)