[Asterisk-Users] Minimum CPU required for 60 calls

[steve at daviesfam.org]

On Tue, 2 Aug 2005, Andrew Kohlsmith wrote:

> On Tuesday 02 August 2005 09:55, Adam Dobrin wrote:
> > And as much as you dislike these kinds of questions; its unfortunate
> > that the community doesn't have any good answers to them available--they
> > should be.  It would be great if we could get some independent
> > verification of digium's claims/figures.
> 
> Unfortunately it's NOT that simple.  The motherboard and chipset play a big 
> part in this, as does the network card, the types of codecs you're 
> transcoding between, the SIP UAs if you're using it, what esle the box is 
> doing...  
> 
> Honestly if you're unsure you grab a box you think will work (use some margin 
> here) and try.  Report back.  It's the only way you'll figure it out.  I (and 
> most others) can't be arsed to try and cut every corner so you just don't see 
> the figures, and Digium's figures are for a specific system and setup.  YMMV.

So,

I know that a 3GHz P4 box with 1GB ram, Intel 815 chipset can handle 120 
concurrent calls on Zaptel PRI trunks - these are looped, with one side of 
the call playing musiconhold, the other side playing various gsm prompts.  
About 70% CPU used, no slips or anything, subjective voice quality 
perfect.

I was able to add 5000 SIP and 5000 IAX2 peers registering - that's about 
100 registrations per second - that pretty much fills the CPU up but still 
things sound fine.  These were using realtime but with rtcachefriends I 
think.

But, on top of that add a Monitor() into gsm format on one side of each 
call - that's 60 Monitors - and cpu starts becoming a problem.

Of course, I can't answer the question as to minimum CPU - I only have the 
CPU that I have.

Hope that is some help,
Steve