[Asterisk-Users] internet bandwidth

[kido noagbodji]

Thanks for the input ...

Kido
----- Original Message ----- 
From: "Kanuri, Seshu (Company IT)" <Seshu.Kanuri at morganstanley.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
Sent: Thursday, November 18, 2004 3:47 PM
Subject: RE: [Asterisk-Users] internet bandwidth


> /SNIP/
> Some corrections are needed: 6.3kbps of G723.1 will become around 17kbps
> on the IP level without silence suppression because of the additional
> overhead imposed by protocols like RTP, IP, etc . If you add the
> Ethernet (or WAN protocol overhead) this will increase even more
> (although slightly).
>
> Similarly, a voice stream of G729 at 8kbps will become around 24kbps on
> the IP level, and slightly more on the Ethernet or ppp level (around 25
> kbps).
>
> So, for 20 channels of 6.3kbps G723.1, you will need around 340 kbps on
> the IP level without silence suppression.
>
> For 20 channels with G729, you will need around 480 kbps.
>
> And of course, these calculations apply both ways (upstream &
> downstream).
>
> If you chose IAX instead of SIP, you will save lots of bandwidth if all
> (or most) of those 20 calls are directed to the same host.
>
> Best regards,
> Vlasis.
>
> /SNIP/
>
> Above calculations by Vlasis appears accurate, based on our experience.
> These are the calcualtions many of our clients are experiencing.
>
> Seshu Kanuri
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