[OpenSIPS-Users] Asterisk Cluster Scenario

[Richard Revels]

http://www.opensips.org/index.php?n=Resources.DocsTutLoadbalancing


On Sep 25, 2010, at 6:22 AM, Stefano Sasso wrote:

> Hello folks,
> 	my company has experience in setting up single asterisk setup, but
> recently one of our customers asked us to set up an asterisk cluster,
> that must be High Availability and Load Balanced.
> So I wrote here to have some hint or advice about the configuration we thought.
> 
> First of all I'll explain you the scenario:
> The asterisk cluster must serve as Call Center "Hub-and-Spoke". There
> are lots of little call-centers (~15 ops), phisically separated, that
> must appears as a single "Big Virtual Call-Center". The call-center is
> inbound and outbound.
> Initially the "Virtual Call-Center" will be composed of 15 small
> call-centers (= ~230 ops), but the prevision is to grow to ~800 ops.
> 
> Asterisk must work as B2BUA, because the customer does not want the
> call-centers contact directly the upstream SIP providers. Asterisk
> server must also record the call and, maybe, do some transcoding.
> 
> The single asterisks instances talk each-other with DUNDi/IAX2 to pass
> the calls from an op to another op registered on another server.
> We'll use a mysql database (NDB cluster) to avoid to have multiple
> sip.conf files with the registration informations (asterisk-rt).
> We must, in any case, use asterisk, because the whole call-center has
> to be integrated with a 3rd part software for predictive calling ad
> power dialing which has been developed for asterisk.
> 
> The SIP servers are behind NAT, because the customer want to use only
> one public IP address; every asterisk server will have a different RTP
> port range to avoid rtp conflicts.
> 
> And, for now, the LB part works manually registering the ops on
> different asterisk servers.
> But now we have to achieve the HA part of the setup.
> 
> We started considering a SIP hardware load balancer, like Radware or
> Brocade, but neither a single nor a couple of this equipments (HA,
> remember?) do not fit in the customer budget.
> So, we started thinking about use OpenSIPS (formerly OpenSER) as a SIP
> load-balancer. (the customer has server hardware that could be used
> for this, and we will use VRRP for redundancy).
> 
> In the OpenSIPS features we read "load balancing with failover", but
> we could not find any useful and complete configuration example.
> Is OpenSIPS able to know if an asterisk server is UP or DOWN, or must
> we use a 3rd part tool, like mon?
> 
> Anyone has experience in use OpenSIPS as SIP load balancer (not to
> work as "real" SIP proxy)?
> 
> Any hint/advice for this part, or for the global setup?
> 
> 
> Thanks in advance for the help!
> 	Stefano
> 
> PS: sorry for my weak english
> PS2: sorry for cross posting but, if the general setup is more
> asterisk related, the OpenSIPS part is, obviously, OpenSIP specific.
> 
> -- 
> Stefano Sasso
> http://stefano.dscnet.org/
> 
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