We're doing this. Our Polycom phones point to a domain name that support SRV
records which gives us a roughly even distribution of calls. We have OpenSER
systems sitting in front of the phones. Each OpenSER system is configured with
different primary/secondary/tertiary Asterisk boxes. When a phone registers
with SER, it 'copies' the registration down to all the Asterisk systems.
However, now that I find we allegedly could have used regexten on Asterisk to
replicate the registrations (yet to see docs on how this works), that $8k we
spent on systems for OpenSER suddenly seems like money not quite so well spent.
Calls to the PSTN are routed from Asterisk back to the OpenSER proxies where it
sends it to the PSTN gateway.
Eventhough it all seems to work quite well, and using OSPF we have been able to
actually fail an interface on a single OpenSER or Asterisk box and fail over an
RTP stream (only a few seconds of dead air), due to the horrible Asterisk
documentation, our main challenge has been in replicating phone registrations
between the Asterisk systems.
It would have been great if the Asterisk product was mature enough to support
Realtime SIP for storing registrations from multiple Asterisk boxes. On the
surface you'd think it's possible, but every one has a different opinion about
whether it's technically shown to work.
If your going to try and set up a HA Asterisk solution be prepared for a really
tough time.
Doug.
-----Original Message-----
From: Wai Wu [mailto:[EMAIL PROTECTED]
Sent: Fri 3/10/2006 9:48 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Cc:
Subject: RE: [Asterisk-Users] Clustering
If all the sub-servers register themselves to the frontend load
balancer and support reinvite, the load balancer can decide which server to
send the call to based on the CPU utilizations of the call processing servers.
I'm assuming all calls are voip calls here.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Ron
McCarthy
Sent: Friday, March 10, 2006 2:22 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [Asterisk-Users] Clustering
Hello All,
Ive been doing more and more research on trying to setup a
cluster/load balancer for Asterisk. All the Asterisk boxes would be using a
config that is the same between them all (via a DB), but we want one location
to point the phones to, and from there that machine/device will send it to a
Asterisk server so the call can be processed. I know you cant balance the whole
call, ie: once the call is started the RTP stream has to go to the same server,
but a new call could go to a different server if perhaps the 1st server was
unreachable.
Has anyone tried this, or got this to work? Ive been looking at
using a Juniper Session Border Controller, but not sure if thats gonna do the
trick, and then we also have SER..
Any comments would be great!
Thanks
Ron
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