[Asterisk-Users] IVR setup (was "Dialogic supported well?")

[Scott Stingel]

Hi Jason-

I was going to update the page called "Dimensioning an Asterisk System", at
the request of Philipp von Klitzing, who set up that page.  Maybe at the
same time, we could do the page you refer to?

As far as IVR, my customer's set up is a bit unusual, extremely high call
volume and very short calls (3 seconds).  This results in huge numbers of
PRI call handshakes, which I think is the thing that overloads the
processor.

I've used a couple of different setups, and all hit roughly the same maximum
call rate.  The fastest setup is 2.4G Xeon's, Fedora 1, and TE410P's.
E400P's and TE410P's were about the same in performance in my load testing.

I think as a rule of thumb, in a more normal IVR setup with longer calls, 4
E1's can be handled fairly safely, and between 6 to 8 E1's would be the
absolute maximum.  When Mark gets around to beefing up the PRI driver error
handling (hint hint Mark), these numbers might go higher, as I think there
is a lot of time spent handling frame retransmissions that might be avoided.
This is still under investigation - it's really hard to debug things with
this level of call activity.

regards,

Scott

Scott M. Stingel 
Emerging Voice Technology Inc.

Email:          scott "at " evtmedia.com 
URL:            www.evtmedia.com 

 

>-----Original Message-----
>From: asterisk-users-admin at lists.digium.com 
>[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of Jason Boyd
>Sent: Tuesday, March 09, 2004 5:12 PM
>To: asterisk-users at lists.digium.com
>Subject: Re: [Asterisk-Users] IVR setup (was "Dialogic 
>supported well?")
>
>> I was surprised to find out that even simple IVR apps under asterisk
>> started hicupping when over about 60-80 channels were running - and
>> all they were doing was speaking short prompts and detecting DTMF's. 
>> Admittedly these are busy systems (lots and lots of new calls over
>> short time periods), but I've built Dialogic-based systems 
>in the past
>> for almost identical app's - and they were able to handle 2 
>to 3 times
>> this many channels on a much slower central processor.
>
>Scott, could you describe your hardware setup?  I'd like to add it to
>the list of successful configurations in the wiki, since there's
>currently no description of an IVR-only system.  (I assume that below
>the 60-channel mark you'd still call it "successful".)
>
>Thanks, Jason
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