[55724] in North American Network Operators' Group
Re: VoIP QOS best practices
daemon@ATHENA.MIT.EDU (Stephen J. Wilcox)
Mon Feb 10 12:59:26 2003
Date: Mon, 10 Feb 2003 17:56:13 +0000 (GMT)
From: "Stephen J. Wilcox" <steve@telecomplete.co.uk>
To: Bill Woodcock <woody@pch.net>
Cc: nanog@nanog.org
In-Reply-To: <Pine.GSO.4.44.0302100945480.12675-100000@paixhost.pch.net>
Errors-To: owner-nanog-outgoing@merit.edu
On Mon, 10 Feb 2003, Bill Woodcock wrote:
>
> > > Looking for some links to case studies or other documentation which
> > > describe implementing VoIP between sites which do not have point to
> > > point links. From what I understand, you can't enforce end-to-end QoS
> > > on a public network, nor over tunnels. I'm wondering if my basic
> > > understanding of this is flawed and in the case that it's not, how is
> > > this dealt with if the ISPs of said sites don't have any QoS policies?
>
> QoS is completely unnecessary for VoIP. Doesn't appear to make a bit of
> difference. Any relationship between the two is just FUD from people
> who've never used VoIP.
My conclusion too when I looked at this a couple years back.
However, its important that the backbone is operating "properly" ie not
saturated which I think should be the case for all network operators, theres a
requirement tho if the customer has a relatively low bandwidth tail to the
network which is shared for different applications, its probably a good idea to
make sure the voip packets have higher priority than non-realtime data... (this
last comment is a suggestion, I've not actually tested this in a real
environment, low b/w lab tests tend to exclude other traffic flows)
Steve
