[e2e] Re: VoIP performance
Henning G. Schulzrinne
hgs at cs.columbia.edu
Sun Apr 29 13:41:52 PDT 2001
RJ Atkinson wrote:
> At 19:57 25/04/01, Fred Baker wrote:
> >How about we do it the other way. You produce someone, anyone, anywhere, who says that VoIP sound quality across the North American backbone is good. We have good experience with it within highly over-provisioned LAN networks, and we have reasonable experience with it in networks that use the tools we have produced for it. But I don't hear people saying that's true over the backbone. I'm struggling to explain that fact if there is no problem anywhere.
> If you let me use vocoders of my own choosing, then
> I think VoIP sound quality across any set of North American
> Tier-1 providers is good. Note well that I'm not including
> smaller providers, many of whom are not overprovisioned on
> bandwidth. If you force me to use a particular standard vocoder
> of your choice, I'll pass however. It makes A LOT of difference
> which vocoder is in use.
Can you identify this "vocoder" by name or number? I don't think a 2.4
kb/s vocoder is acceptable voice quality, however, if "recognizing the
person who's speaking" is a requirement.
Henning Schulzrinne http://www.cs.columbia.edu/~hgs
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