[Asterisk-Users] Concurrent users

[trixter http://www.0xdecafbad.com]

On Mon, 2005-07-18 at 21:46 -0300, Rodrigo Otavio de Fraga wrote:
> How can I calculate the quantity of concurrent users using a bandwith
> of 512Kbps ?
> 
>  
> 
> All users are using G.729 codec.
> 

How large is each packet?  There is packet overhead for each packet that
needs to be counted in (at  the very least ip/udp but likely link layer
framing and rtp data that comes out of that as well).  

The codec is roughly 8kbps so you can in theory get 64 channels, but it
will never ever work that way (on the net) because of the packet
overhead.  Odds are you would be safe with a guess of 40-50 but I havent
sat down and done the math because I am not going to guess on your
sample size and such.

I think that the wiki needs to have (if it doesnt already) explanations
of all of this along with jitter buffers, what they are, why they are
needed in some configurations, etc, since that does play into this from
a performance angle.


-- 
Trixter http://www.0xdecafbad.com     Bret McDanel
UK +44 870 340 4605   Germany +49 801 777 555 3402
US +1 360 207 0479 or +1 516 687 5200
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