[Asterisk-biz] Large Asterisk Setup (~500 Concurrent Calls + Scalability)

[Matt Roth]

Allow me to clarify that statement.  The traffic on the PCI bus to the 
CPU is the bottleneck.  We have sent emails to Digium regarding multiple 
quad-span cards in a single PC-class machine and they recommended 
against it for this reason.

 From the Digium emails:
 - I'd use two machines, with two quad cards each.  And then, I'd need 
to be using only the G.711 ulaw protocol.  Then, I'd still use a 
mid-range dual Xeon CPU machine in the 2.4GHz+ spectrum.

We do not want to be limited to the G.711 ulaw codec and we would need 
at least four quad-span cards for a single machine setup.  Any single 
machine setup also has inherent scalability issues.

Matthew Roth
http://www.voip-info.org/tiki-index.php?page=Running%20Asterisk%20on%20Debian

Brian West wrote:

>> Originally, we planned to implement this design by purchasing one
>> multi-processor machine and putting multiple quad-span T1 cards
>> (Wildcard TE4xxPs) into it.  Through research, it was determined that
>> the PCI bus couldn't handle the digital signal processing (DSP) from
>> more than one quad-span card.
>>
>
> The PCI bus doesn't do any processing.. The CPU would be... you can 
> get two or more quad cards in a box if you  don't do any transcoding.
>
>
> /b
>
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