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RE: VoIP QOS best practices
From: "Truman, Michelle, SALES" <mtruman () att com>
Date: Mon, 10 Feb 2003 13:34:55 -0500


Yes, but most companies do not want to upgrade the access link to
unneeded levels just to ensure that VOIP never has contention. It is on
the access link where QOS matters, ingress and egress. That is where we
(AT&T) have deployed it and where it makes sense. It's not about pitting
one customer's traffic against another's across the core. The core is
over-provisioned for high bandwidth and simplicity. It is pitting one
customers applications against their other applications. It is about
large packets (1500 byte) vs. small VOIP packets. It is about getting
the VOIP out the door while less sensitive applications wait in queue if
that is what is required on the access link. It is usually about T1 and
below.

Michelle

Michelle Truman   CCIE # 8098
Principal Technical Consultant
AT&T Solutions Center
mailto:mtruman () att com
VO: 651-998-0949 (NEW NUMBER)
w 612-376-5137 





-----Original Message-----
From: Valdis.Kletnieks () vt edu [mailto:Valdis.Kletnieks () vt edu]
Sent: Monday, February 10, 2003 12:23 PM
To: Charles Youse
Cc: Bill Woodcock; nanog () nanog org
Subject: Re: VoIP QOS best practices 


On Mon, 10 Feb 2003 13:02:39 EST, Charles Youse <cyouse () register com>
said:
That doesn't seem to make a lot of sense - is it that QoS doesn't work
as advertised?

Qos is designed for dealing with "who gets preference when there's a
bandwidth
shortage".  Most places are having a bandwidth glut at the moment, so
the VoIP
traffic gets through just fine and QoS isn't able to provide much
measurable
improvement.


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