[asterisk-users] Asterisk IVR Scalability

[Mike Trest]

See replies in text below:
At 07:09 AM 8/31/2008, Sriram wrote:
>Hi
>
>My Scenario is to implement Asterisk in a Call center.. I;ve TE420 
>Digium card and plan to terminate 4 PRIs (E1) on it. I;ve 30 Agents 
>inside..Since its a PRI i m not using any hardware echo cancellation 
>module.The calls would first land on Asterisk and depending on the 
>options would be transferred to the Agent. I've read lot of opinions 
>on voip-info.org giving asterisk hardware dimensions. I would like 
>to take a final call depending on your expert answers :
>
>Scenario : There would be 120 calls for sure during a 2 hour period 
>of a day , rest of times it would be serving max. 50 calls. No 
>matter how many calls come only 30 would be able to talk to agents 
>rest would be listening to some files on the IVR or be involved in 
>some polling..This is what the client wants as of now but he needs a 
>scalable solution depending on traffic..
>
>Queries :
>
>1. For this initial setup Will a Dual processor (Xeon) with 2 Gigs 
>of RAM with TE420 be able to handle the load ? All my agents would 
>be using the softphones

This is fine.  Even more powerful that what I have used with 240 call 
legs (call in and extensions out)

>2. What should be the ideal CPU load that i need to watch - may be 
>if the load average crosses 6 or 7 - should i worry ?

Not to worry unless you do a lot of media / codec transcoding.  Keep 
everything the same at all times.

>3. Even though i m adviced against AGI scripts (as they eat precious 
>CPU cycles)- they seem very powerful and i m desperate to use 
>them...Will the above setup get hampered in any way if i use them ?

I have used them to answer IVR with up very complex scripting and 
interaction.  Very little overhead noticed even with 50+ running at 
the same time.

>4. Now scalability - If i want to increase the agents to 50 from 30 
>and add another PRI - what are the areas i should focus on - another 
>machine ? or some additional RAM and processor ?

I did the opposite.  I put 60 astrisk units together in a farm to 
handle IVR front end
to 6,000 simultaneous calls.  With multiple CPUs, I gained 24*7 dependability

>
>I;ve been working all along on Dialogic but want to shift to 
>Asterisk as it has lot of features and just fits in my needs (PBX + 
>IVR in 1 box! ).

Good move! ! ! !

>
>Please advice
>
>Thanks in advance
>Sriram
>
>
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