[asterisk-dev] How to get to 10.000 open calls

Wed Apr 22 03:39:01 CDT 2009

Does anybody know a document that would explain Openser to an Asterisk
specialist? How to configure a dialplan, how to call a database for
information, etc?
My Asterisk dialplan for a round-robin load balancer between 3 IP addresses
goes below. How would you express the same simple idea in OpenSer? The
technique sends each to a different IP, defined in the global vars GW0, GW1
and GW2. It is not a true load balancer, but it works quite well.

[general]
static=yes
writeprotecit=no
extenpatternmatchnew =yes
clearglobalvars=yes
[globals]
GW0 = xx.zz.rr.tt
GW1 = aa.bb.ede.yr
GW2 = rr.tt.yy.ddd
MX = 3
MXC =0
[default]
exten =>_X.,1,NoOp(${CHANNEL(channeltype)} Active: ${GW})
exten =>_X.,n,Set(CALLERPRES()=allowed) ; ONLY trunk
exten =>_X.,n,Set(GROUP()=trunkgroup1)               ;Set Group
exten =>_X.,n,Set(SIPIP=${SIPCHANINFO(recvip)})
exten =>_X.,n(entrada),GotoIf($["${EXTEN:0:1}" = "1"]?dialout,${EXTEN},1)
exten =>_X.,n,GotoIf($["${EXTEN:0:1}" = "0"]?dialout,${EXTEN},1)
exten =>_X.,n,Goto(dialout,${EXTEN},1)
exten =>_X.,100,Hangup(34)
exten =>_X.,300,NoOp(${CHANNEL})
exten =>_X.,301,Set(SIPIP=${CUT(CHANNEL,:,1):8})
exten =>_X.,302,Goto(entrada)

[dialout]
exten =>_X.,1,Set(GLOBAL(MXC)=${MATH(${MXC}+1,int)})
exten =>_X.,n,NoOp(MXC=${MXC}  ${MX})
exten =>_X.,n,NoOp(${MATH(${MXC} % ${MX},int)})
exten =>_X.,n,Goto(dialoutx,${EXTEN},1)
[dialoutx]
exten =>_#X.,1,Dial(SIP/${EXTEN:1}@${GW${MATH(${MXC} %
${MX},int)}},45,L(3600000))
exten =>_#X.,n,Hangup()
exten =>_X.,1,Set(Target=${GW${MATH(${MXC} % ${MX},int)}})
exten =>_X.,n,Verbose(0,Dialing ${EXTEN} to ${Target})
exten =>_X.,n,Dial(SIP/${EXTEN}@${Target},45)
exten =>_X.,n,Hangup()

-----Original Message-----
From: asterisk-dev-bounces at lists.digium.com
[mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of
alexander.harrowell at stlpartners.com
Sent: Wednesday, April 22, 2009 4:24 AM
To: Asterisk Developers Mailing List
Subject: Re: [asterisk-dev] How to get to 10.000 open calls

IfByPhone, which provides a hosted platform for voice CRM apps, is using a
big gaggle of Asterisken to handle calls. They face a scaling issue in
terminating incoming calls from their SIP peers and routing them into the
Asterisk cloud.

They are using OpenSER to talk to the peers and do the initial triaging of
calls into Asterisk queues.

-original message-
Subject: Re: [asterisk-dev] How to get to 10.000 open calls
From: Alex Balashov <abalashov at evaristesys.com>
Date: 22/04/2009 8:41 am

A proxy derived from the OpenSER stack could do it.

Venefax wrote:

> Yes, I have the box. And I will get the calls next week. I was thinking to
> use the Asterisk feature where you can start different Asterisk using -C
> \path_to\config\file, and start 15 instances. But to be able to load
balance
> it is a nightmare, since many clients do not accept or follow redirects
(SIP
> 302 Moved). I am out of tricks, unless I setup another technology for load
> balancing but then why not use the same (x) technology for everything?
What
> technology would that be that can handle 10.000 sip connections, not
> touching the media? My Cisco 7301 would not scale so far out.
> 
> -----Original Message-----
> From: asterisk-dev-bounces at lists.digium.com
> [mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Tzafrir Cohen
> Sent: Wednesday, April 22, 2009 3:19 AM
> To: asterisk-dev at lists.digium.com
> Subject: Re: [asterisk-dev] How to get to 10.000 open calls
> 
> On Wed, Apr 22, 2009 at 02:48:11AM -0400, Venefax wrote:
>> I am using 1.6.2 and directrtp=yes. I need to scale to 10.000 open calls
> on
>> a box with 1288 GB or RAM and 16 Cores. Is there any modification to the
>> source code that would be obvious, any bottlenecks? I will never to
>> transcoding and the media should, theoretically, flow outside. I have 15
> IP
>> addresses already configured in the same box, on two different nics, to
>> spread the interrupts. Is this a dream or will this work with some
> tweaking?
> 
> Do you have the system now?
> 
> While it's most likely be a dream, identifying the current bottlenecks
> might  be useful :-)
> 
> Just a few uneducated guesses of my own:
> 
> * More than one IP per NIC won't help and only cause some administrative
>   issues
> * I'm not sure how much the extra memory can help. I suspect htat if you
>   boot the system with mem=<whatever_needed_for_16GB> the results won't
>   differ greatly
> * It would also be interesting to see how the results scale with various
>   values numbers of cores. This is again something you can set at boot
>   (numcpus=N). I wonder just how far from linear it will be.
> 

-- 
Alex Balashov
Evariste Systems
Web    : http://www.evaristesys.com/
Tel    : (+1) (678) 954-0670
Direct : (+1) (678) 954-0671
Mobile : (+1) (678) 237-1775

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