[asterisk-biz] Asterisk Large System - More info

[Charles R. Gomes]

Hey Guys

I've been browsing the list looking for more information on asterisk 
behavior for large system.

As for now I've got a project with

300 SIP Extensions to start, with future growth (scalability)
Capability of recording all extensions simultaneously during peak time. 
And keeping the call recording for 30 days.
SIP Calls being terminated over a Cisco 5400 Gateway
Extra 100(+) FXO channels for incoming calls. (calls are going to be 
routed to the SIP Extensions.


As far as I get the Hardware setup that I thought that will handle it is:

Two Asterisk Server -  Quad Dual-Core Opteron Servers running for call 
processing
One SER Server - Dual Dual-Core Opteron for SIP routing and SIP 2 SIP 
calls (no recording)
One Serial Over Ethernet Storage for recording the calls (the two 
asterisk servers will commit to that device)

For the setup I was going to put a lot of RAM on the serves something 
like 8GB and make asterisk record the calls to a RAMDRIVE. Another 
process will run with low priority moving the Recordings from the 
RamDrive to the Storage.

If Asterisk One dies, Asterisk two assumes.
If SER dies, ASTERISK one or TWO will handle without the proxy.

We need to avoid single point of failure as also be able to scale well.

Other possibility that we may look is having instead of a storage, is 
having a Extra Asterisk getting the calls as a conference over IAX and 
saving it.
As far as I see it will also need to deal with the real time recording 
on RAM. Because seek delay on multiple files being writing as small 
chunks of data (20ms voice data) on the HD will make voice choppy. So 
the solution will have to involve moving from RAM do HardDrive as the 
conversation ends. As I read it will be easy to record a 30megs file 
instead of several small chunks of 100KiloBits. As the other process can 
run in low priority and not realtime. It may not affect asterisk 
recording to RAM.

Do you guys think that the servers will be able to handle that ? Does 
the SIP protocol can handle that redundancy ?


Has anyone designed a system similar to this ?

Does anyone wants to add a two cents comment on that design ?

Is any company available for paid consulting ?


-- 

Charles Rauber Gomes                                                                     
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