Re: Help needed on VoIP project

[Guy T Almes <>]

Walt,
 Excellent.
       -- Guy

--On Monday, March 01, 2004 08:49:10 -0600 Walt Magnussen 
<> wrote:

> Jeremy, Guy, et.al
>
>   The network requirements testing is one of the tasks that we are
> working on as we speak.  We have purchased an Agilent Voice Quality
> Tester (VQT) and are creating a testbed that will measure the impact of
> Jitter, Packet Loss and Latency on Voice Quality (the pudding test).
>
>    We will keep you posted on progress on this one.
>
> Walt
>
>
> Walt Magnussen, Ph.D.
> Director for Telecommunications
> Texas A&M University
>
> 979-845-5588 phone
> 979-777-0999 cell
> 979-847-1111 fax
>
> > > > Jeremy George 
> > > > <>
> > > >  03/01/04 08:40AM >>>
>
>   Turning over the underlying network requirements would be a huge
> help for those of us contemplating running VoIP.  It would be great
> if the ITEC really looked into it.
>
>   There was an interesting email discussion around last October in the
> ietf sipping group on draft-ietf-ieprep-framework-06.txt in re jitter
> in
> VoIP.  The conclusion, if such a term can be ascribed to anything in
> an ietf mailing list :), was that jitter, per se, was not a critical
> issue.  Delay variation needs to be understood in relation to jitter
> buffer depth.  It's the depth of the buffer that's critical.  Too
> little and you get snap, crackle and pop.  Too much and you introduce
> unacceptable delay.
>
>   Also, "packet loss" in VoIP is a textured term that needs to be
> understood in the context of maximum acceptable M-to-E delay.  In
> many contexts a packet is "lost" (e.g. undeliverable) after 150ms.
>
> - Jeremy
>
>
> On Mon, 1 Mar 2004, Guy T Almes wrote:
>
> > Date: Mon, 01 Mar 2004 09:15:22 -0500
> > From: Guy T Almes 
> > <>
> > To: Jon Zeeff 
> > <>,
> >      Walt Magnussen 
> > <>,
>
> > Subject: Re: Help needed on VoIP project
> >
> > Jon,
> >   I agree.
> >   Robustness of user experience in the presence of
> > good-but-perhaps-not-very-good IP service is one way to put it.
> >   Regards,
> >         -- Guy
> >
> > --On Monday, March 01, 2004 07:54:31 -0500 Jon Zeeff
> <>
> > wrote:
> >
> > >
> > > This is somewhat off topic, but to me, the most important thing to
> test
> > > is resistance to packet loss and jitter.
> > >
> > >> VoIP project.  One of the 2004 projects is to evaluate SIP
> > >> interoperability between various vendors SIP based instruments and
> other
> > >> vendors SIP based servers.  The goal is to document the level of
> > >> interoperability.  Listed below is a partial list of desired
> voice
> > >
> > >
>
> --