[55753] in North American Network Operators' Group
RE: VoIP QOS best practices
daemon@ATHENA.MIT.EDU (Stephen J. Wilcox)
Mon Feb 10 14:26:25 2003
Date: Mon, 10 Feb 2003 19:01:39 +0000 (GMT)
From: "Stephen J. Wilcox" <steve@telecomplete.co.uk>
To: Ray Burkholder <ray@oneunified.net>
Cc: Bill Woodcock <woody@pch.net>,
Charles Youse <cyouse@register.com>, <nanog@nanog.org>
In-Reply-To: <2697FBAC6B1EF643B30E7B16B6E6958F0E9C85@master.oneunified.net>
Errors-To: owner-nanog-outgoing@merit.edu
On Mon, 10 Feb 2003, Ray Burkholder wrote:
>
> QoS isn't necessarily about throwing packets away. It is more like
> making voice packets 'go to the head of the line'. Of course, if you
> have saturation, some packets will get dropped, but at least the voice
> packets won't get dropped since they were prioritized higher.
Thats what I meant too...
To qualify further on where it needs to be deployed, its required on whatever
the slowest link in the typical path to "the Internet". What I mean is that if
you download your email you will utilise the whole bandwidth of the slowest link
in the chain, this may be a dialup modem but more likely in the office to be
your T1, you dont want this full utilisation of the link (which will occur in
small bursts of a few seconds, dont forget with voice we are interested in per
second traffic volumes not 5 minute averages!) to affect the jitter you need to
implement priorities at this point.
Steve
>
> Ray Burkholder
>
>
> > -----Original Message-----
> > From: Bill Woodcock [mailto:woody@pch.net]
> > Sent: February 10, 2003 14:05
> > To: Charles Youse
> > Cc: nanog@nanog.org
> > Subject: RE: VoIP QOS best practices
> >
> >
> >
> > > That doesn't seem to make a lot of sense - is it that
> > QoS doesn't work as advertised?
> >
> > That's generally true as well. But why would you need it? What's the
> > advantage to be gained in using QoS to throw away packets, when the
> > packets don't need to be thrown away?
> >
> > > As someone who is looking to deploy VoIP in the near
> > future this is of particular interest.
> >
> > Go ahead and deploy it. It's easy and works well. It
> > certainly doesn't
> > need anything like QoS to make it work.
> >
> > -Bill
> >
> >
> >
>
