asterisk users - Jul 2004 - Asterisk scalability?

Hi

I plan to setup an asterisk box to function as a SIP gateway forwarding 
lots of calls to/from a backend of several other asterisk boxes, each 
with a TE410 card for PSTN connectivity.  It will only gateway the 
calls into the PSTN gateways. No transcoding is planned - only plain 
ALAW. How many concurrent calls would you think this can handle? I'm 
asked to plan a system that can handle >1000 concurrent calls...

thanks for any input

regards

roy

Hi Roy-
I've done a lot of load testing with asterisk and TE410P's.

My guess, with no transcoding, is that you might be able to handle 8 E1's
max on the PSTN side absolute max (ie: 2 TE410P's).  This assumes you have a
fast processor.    If you're using T1's, scale these numbers up
accordingly,
as there are fewer channels per span.

If this answer is lower than you might expect, consider that every byte of
data has to pass through the processor.  The 410's are capable of
bus-mastering, and so are an improvement over the T400P's, but still I think
you run into horsepower limitations. 

Regards
Scott

Scott M. Stingel
President,
Emerging Voice Technology, Inc.
Palo Alto California & London England
www.evtmedia.com 

-----Original Message-----
From: asterisk-users-admin@lists.digium.com
[mailto:asterisk-users-admin@lists.digium.com] On Behalf Of Roy Sigurd
Karlsbakk
Sent: Saturday, July 31, 2004 8:25 AM
To: Asterisk Users
Subject: [Asterisk-Users] Asterisk scalability?

Hi

I plan to setup an asterisk box to function as a SIP gateway forwarding lots
of calls to/from a backend of several other asterisk boxes, each with a
TE410 card for PSTN connectivity.  It will only gateway the calls into the
PSTN gateways. No transcoding is planned - only plain ALAW. How many
concurrent calls would you think this can handle? I'm asked to plan a system
that can handle >1000 concurrent calls...

thanks for any input

regards

roy

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Roy Sigurd Karlsbakk wrote:
> Hi
>
> I plan to setup an asterisk box to function as a SIP gateway 
> forwarding lots of calls to/from a backend of several other asterisk 
> boxes, each with a TE410 card for PSTN connectivity.  It will only 
> gateway the calls into the PSTN gateways. No transcoding is planned - 
> only plain ALAW. How many concurrent calls would you think this can 
> handle? I'm asked to plan a system that can handle >1000 concurrent 
> calls...
Search the archives and the wiki.  Look for a thread a few months ago 
called "Asterisk on 64-bit"

Nick