Hi,
don't forget there are the ip, udp and RTP headers as well.
I am told that with the maximum compression (CS-ACELP) the bandwidth you
need for the voice itself is 8kbps. However, voice packets are relatively
small so for 40 bytes of payload, you end up with an ip packet that is more
than 80 bytes (ip, udp and rtp payload). So without RTP compression you
should foresee 17-18kbps, with RTP compression down to 12kbps pre voice
channel but this introduces additional delays.
for more info :
http://www.cisco.com/pcgi-bin/Support/PSP/psp_view.pl?p=Internetworking:VoX:VoIP
>From: "W Jones" <[EMAIL PROTECTED]>
>Reply-To: "W Jones" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED], [EMAIL PROTECTED]
>Subject: Re: Bandwidth constraints for VoIP
>Date: Tue, 09 Jan 2001 08:26:49 -0000
>
>Hallo there....
>64K should be adequate...
>Max bandwidth for voice on Cisco router when configured right is 10k.
>That means you will not use more than 40k for four connections.
>
>Anybody has more info on this???
>
>WJ
>
>
> >From: "Ishtiaque Mahbub" <[EMAIL PROTECTED]>
> >Reply-To: "Ishtiaque Mahbub" <[EMAIL PROTECTED]>
> >To: [EMAIL PROTECTED]
> >Subject: Bandwidth constraints for VoIP
> >Date: Tue, 09 Jan 2001 11:47:49 +0600
> >
> >Hello Group!
> >
> >A very happy new year to you all!
> >
> >I was wondering if any one could advise what is the minimum Bandwidth
> >required for Voice Over IP installation on Cisco Routers (Router Series
> >will
> >be 2600).
> >
> >Is 64kbps is too steep for 4 simultaneous voice operations?
> >
> >Suggestion, advices welcome.
> >
> >Regards
> >
> >Ishtiaque
> >
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