[asterisk-ha-clustering] New HA setup

[Olle E. Johansson]

3 nov 2009 kl. 15.19 skrev Frederic Jean:

>
>
> Thanks Olle, I can only agree with you; it needs love to work  
> properly, lots of love : )
And propably a major redesign to fulfill the expectations from the  
users :-)

>
> So talking about the "other" school, you put a SIP Proxy on the two  
> servers with a virtual IP
> and get the Asterisk to talk with the same database setup we  
> described here I guess.

The proxys need to handle one or two virtual IPs if you need NAT  
support. By design,
the SIP protocol uses DNS for load balancing and failover, so it  
should not be needed,
but most phones (as well as Asterisk) doesn't implement this fully so  
in the end you
usually end up with heartbeat.

How much of the database you need to talk with from Asterisk in this  
setup depends on
what you do in the proxy. Some information that the proxy looks up  
regardless can be
sent in sip headers to Asterisk.

It all depends on your application. Running a SIP-PSTN gateway service  
for consumers is one thing, running a hosted PBX is completely  
different and requires a different setup.

>
> It sure is less complicated and more straight forward in terms of  
> dialplan, etc.
Well, it does require some new thinking to get it right if you're used  
to have Asterisk matching
peers and users.

Maybe we need an AstriSIPcon for having time to discuss this work. :-)

/O
>
>
>
>
>
> On Tue, Nov 3, 2009 at 3:44 AM, Olle E. Johansson <oej at edvina.net>  
> wrote:
>
> 3 nov 2009 kl. 02.35 skrev Frederic Jean:
>
> > Is this something "standard" in a HA Asterisk solution? Has anybody
> > tried something similar?
> > Any comments are appreciated!
>
> There are basically two different schools. The one you describe is
> focused on Asterisk and is based on realtime/dundi. The other one
> focuses on SIP and builds an extensible SIP network based on SIP
> proxys that load balance SIP traffic to a set of Asterisk servers. In
> this case, Asterisk doesn't receive registrations and doesn't "own"
> devices. On the other hand, you can easily add other SIP applications
> than voice. Video, presence, instant messaging...
>
> Asterisk is a great platform, but only for telephony and since it's
> call stateful, it doesn't scale as easily as a SIP proxy. The
> combination is great. This is how I built platforms for service
> providers during many years, and this is also what we teach in the
> Asterisk SIP Masterclasses.
>
> Since I need SIP scalability, I haven't focused on realtime/DUNDI. I
> personally feel that the realtime/SIP implementation needs love to
> work properly and that DUNDI is a bit limited to Asterisk. Nothings
> stops other products from implementing DUNDI, but so far, no one has
> been interested.
>
> Regards,
> /Olle
>
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---
* Olle E Johansson - oej at edvina.net
* Cell phone +46 70 593 68 51, Office +46 8 96 40 20, Sweden