asterisk users - Jun 2005 - Server Load/Capacity

I'm trying to figure out how much call load I can put on a Dual Xeon  
2.4 Ghz Asterisk server acting strictly as an IAX2 call director, as  
show in the diagram below.

The idea is that I have N number of gateway asterisk servers  
connected to the PSTN using T1 Digium boards. Then, I have M number  
of servers where my agents and/or telephone extensions (whether they  
are IAX or SIP hard/soft phones). What I'm trying to accomplish is  
put a server in between these two groups of machines which will  
simply be able to "intelligently" route calls in either direction.  
This "call director" server will only use IAX2 (ulaw) to minimize any
transcoding and "alleviate" load.

Under this scenario, does anyone have any idea how many calls this  
"call director" server may be able to handle/direct?

Thanks,
Waldo

Please see http://200.62.6.122/pastedGraphic.pdf for the diagram

On 23 Jun 2005, at 10:48, Waldo Rubinstein wrote:
> I'm trying to figure out how much call load I can put on a Dual  
> Xeon 2.4 Ghz Asterisk server acting strictly as an IAX2 call  
> director, as show in the diagram below.
>
> The idea is that I have N number of gateway asterisk servers  
> connected to the PSTN using T1 Digium boards. Then, I have M number  
> of servers where my agents and/or telephone extensions (whether  
> they are IAX or SIP hard/soft phones). What I'm trying to  
> accomplish is put a server in between these two groups of machines  
> which will simply be able to "intelligently" route calls in
either
> direction. This "call director" server will only use IAX2 (ulaw)
to
> minimize any transcoding and "alleviate" load.
>
> Under this scenario, does anyone have any idea how many calls this  
> "call director" server may be able to handle/direct?
>
At Astricon the man from Signate showed some benchmark results which  
indicated
a 'stock' PC server could do 122 ulaw SIP passthrough calls at  
acceptable
call quality.
Their own-brand servers can do > 2k (If I remember right).

However I think you should look into Dundi - used correctly with a
clear dialplan you may be able to get rid of the director and
have a cloud of dundi peers instead.

Tim.