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RE: VoIP QOS best practices
From: "Ray Burkholder" <ray () oneunified net>
Date: Mon, 10 Feb 2003 14:38:31 -0500

Many boxes are able to reorder packets.  If packets arrive too late to
be inserted into the conversion stream, they are dropped.  One dropped
packet in a sequence can usually be 'hidden' or 'faked' by the codec.
When more than one packet is missed in sequence, it becomes noticeable
to the listener.

Ray Burkholder

-----Original Message-----
From: Leo Bicknell [mailto:bicknell () ufp org] 
Sent: February 10, 2003 14:44
To: nanog () nanog org
Subject: Re: VoIP QOS best practices

In a message written on Mon, Feb 10, 2003 at 01:19:08PM 
-0500, chaim fried wrote:
happens). There is no reason to implement QOS on the Core. 
Having said
that, there still seems to be too many issues on the tier 1 networks
with pacekt reordering as they affect h.261/h.263 traffic. 

So what's the real problem here?  Are the VOIP boxes unable to
handle out of order packets?  Do the out of order packets simply
arrive far enough delayed to blow the delay budget?  What 
percentage of
reordered packets starts to cause issues?

       Leo Bicknell - bicknell () ufp org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
Read TMBG List - tmbg-list-request () tmbg org, www.tmbg.org

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