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RE: VoIP QOS best practices
- From: Stephen J. Wilcox
- Date: Mon Feb 10 14:28:16 2003
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.
> Ray Burkholder
> > -----Original Message-----
> > From: Bill Woodcock [mailto:email@example.com]
> > Sent: February 10, 2003 14:05
> > To: Charles Youse
> > Cc: firstname.lastname@example.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