Sebastien,
Thanks a lot for the link! Very cool :->
Nigel
----- Original Message -----
From: "Sebastien Venturoso"
To:
Sent: Wednesday, November 06, 2002 3:20 AM
Subject: RE: VoIP data rates [7:56942]
> Here is a link for Voice Codec Bandwidth Calculator:
>
> http://tools.cisco.com/Support/VBC/jsp/Codec_Calc1.jsp
>
> (need CCO login)
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:nobody@;groupstudy.com]
> Sent: Wednesday, November 06, 2002 06:24
> To: [EMAIL PROTECTED]
> Subject: RE: VoIP data rates [7:56942]
>
>
> Matthew Webster wrote:
> >
> > Hi Priscilla,
> >
> > thanks for the help. I have found the chart you referred to and
> > made several calculations - it appears that the bandwidth
> > almost triples when you don't compress the IP, UDP and RTP
> > headers.
>
> Yes. The bandwidth requirement almost triples. (I didn't finish the
> arithmetic before I hit the Post button on my previous message.)
>
> Windows NetMeeting and other such applications might compress the
IP/UDP/RTP
> headers. It's an RFC that's been out for a time (RFC 2508). I don't know
for
> sure if they do, though. It might not be the right approach anyway. I
think
> compressed IP/UDP/RTP is usually implemented at the end points of slow
links
> and isn't meant to be used end-to-end by applications.
>
> _______________________________
>
> Priscilla Oppenheimer
> www.troubleshootingnetworks.com
> www.priscilla.com
>
> >
> > Here we're pretty certain that a typical dial up modem (either
> > 33.6 or 56kbps) have enough upstream bandwidth to handle these
> > codecs. However, we could greatly decrease our bandwidth
> > requirements if we compress the IP, UDP and RTP headers (saving
> > money and bandwidth). However we're not sure if winsock or
> > whatever protocol stack unencapsulation tool on a Microsoft O/S
> > will be able to uncompress the IP, UDP and RTP headers. We're
> > going to try to set up an experiment here as well as check out
> > the Microsoft and Cisco websites, but if you know the answer,
> > then that would be great.
> >
> > cheers,
> > Matthew.
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