Also note that those sizes are for the voice part of the payload only....It does not take into account any payload/packet overhead...
We use G.711 quite a bit on our network, and are traffic flows are right around 80k...
Spencer
************************************************************
Spencer Wood, Network Manager
Ohio Department Of Transportation
1320 Arthur E. Adams Drive
Columbus, Ohio 43221
E-Mail: [EMAIL PROTECTED]
Phone: 614.644.5422/Fax: 614.887.4021/Pager: 866.591.9954
*************************************************************
| "Ray Burkholder" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED] 02/10/2003 02:21 PM |
To: "Charles Youse" <[EMAIL PROTECTED]>, "Alec H. Peterson" <[EMAIL PROTECTED]> cc: <[EMAIL PROTECTED]> Subject: RE: VoIP QOS best practices |
G.711 gives you the 64kbps quality you get on a channel in a PRI line.
No compression is performed.
G.729 is a well accepted codec that performs compression, and with ip
packet overhead, uses about 16 to 24 kbps (can't remember which). It
gives voice quality very close to G.711.
G.723 has a noticeable voice quality change, and is in the 6 to 8 kbps
range.
The optimal is G.729 for quality vs bandwidth issues.
There are some other considerations involved but these are the main
ones.
Ray Burkholder
> -----Original Message-----
> From: Charles Youse [mailto:[EMAIL PROTECTED]]
> Sent: February 10, 2003 14:42
> To: Alec H. Peterson
> Cc: [EMAIL PROTECTED]
> Subject: RE: VoIP QOS best practices
>
>
>
> Speaking of codecs, what are the primary variables one uses
> when choosing a codec? I imagine this is some function of
> how much bandwidth you want to use versus how much CPU to
> encode the voice stream.
>
> C.
>
> -----Original Message-----
> From: Alec H. Peterson [mailto:[EMAIL PROTECTED]]
> Sent: Monday, February 10, 2003 1:40 PM
> To: Bill Woodcock; Charles Youse
> Cc: [EMAIL PROTECTED]
> Subject: RE: VoIP QOS best practices
>
>
> --On Monday, February 10, 2003 10:19 -0800 Bill Woodcock
> <[EMAIL PROTECTED]>
> wrote:
>
> >
> > It works fine on 64k connections, okay on many 9600bps
> connections. T1 is
> > way more than is necessary.
>
> I'd say that largely depends on which codec you are using and
> how many
> simultaneous calls you will have going.
>
> Alec
>
> --
> Alec H. Peterson -- [EMAIL PROTECTED]
> Chief Technology Officer
> Catbird Networks, http://www.catbird.com
>
