29 Dec
2014
29 Dec
'14
1:32 p.m.
Good point. Mobicents is on my list of projects to which I'm due to
contribute something. I'll get on it shortly.
On 29 December 2014 at 11:26, Carsten Bock <carsten(a)ng-voice.com> wrote:
Hi Ben,
that's absolutely for sure! It took us ~2 years to get the DNS-SRV
implementation of major DSL-Modem-Manufacturer right ;-)
Nevertheless, it's the way to go for redundancy. And since Mobicents
is open-source, we can probably simply provide a patch to fix it :-)
Kind regards,
Carsten
2014-12-29 12:13 GMT+01:00 Ben Langfeld <ben(a)langfeld.co.uk>uk>:
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--
Carsten Bock
CEO (Geschäftsführer)
ng-voice GmbH
Schomburgstr. 80
D-22767 Hamburg / Germany
http://www.ng-voice.com
mailto:carsten@ng-voice.com
Office +49 40 5247593-0
Fax +49 40 5247593-99
Sitz der Gesellschaft: Hamburg
Registergericht: Amtsgericht Hamburg, HRB 120189
Geschäftsführer: Carsten Bock
Ust-ID: DE279344284
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On 27 December 2014 at 23:44, Carsten Bock
<carsten(a)ng-voice.com> wrote:
handle
Hi Mahmoud,
Thy typical way, to build a Active/Active setup is by using DNS-SRV
records. The two servers get different IPs and you announce both IPs
using DNS to the devices. Most common User-Agents support this
nowadays, so that's kind of easy. It is specified in RFC3263:
"Locating SIP-Servers" (http://tools.ietf.org/html/rfc3263).
However, when using DNS-SRV records, dialogs and transactions are
still associated with a single server, even though the User-Agent has
an Alternative, in case one server fails. If you want to increase the
HA for this, you can advertise the Domain name instead of an IP
(causes more DNS-Lookups).
Just a word of caution here, there are several SIP stacks which don't SRV lookups correctly. I don't mean to
discourage you from this, but
just to
be aware of it. For example, Mobicents only
understands SRV record sets
which return domain names. If you return IPs, Mobicents will go ahead and
look them up as A records and fail.
>
> You can share the dialog state etween two nodes by using the dialog
> module in db-only mode (db_mode = 1, see
> http://kamailio.org/docs/modules/devel/modules/dialog.html#idp15368320
).
> You cannot share transactions between two
nodes, only dialogs.
>
> In addition, you can work with virtual IPs with Heartbeat/Pacemaker.
>
> At a big operator, we've used a combination of the two: Active/Passive
> for one site and DNS-SRV to distribute it among different sites.
>
> Kind regards,
> Carsten
>
> 2014-12-26 19:07 GMT+01:00 Mahmoud Ramadan Ali
> <cisco.and.more.blog(a)gmail.com>om>:
> > Hi Dears,
> > I have successfully configured Kamailio HA using Heartbeat and
Pacemaker
> > so
> > if one of the two servers should go down the other server will own the
> > virtual IP address and take over.
> > But i have two questions:
> >
> > 1.This model is considered to be Active / Passive redundancy so one
> > server
> > will process the SIP signaling until it goes down and i'm wondering is
> > there
> > is any way two achieve Active / Active redundancy and if so how the
> > signaling will be handled on the servers so they can be aware of the
> > transactions and dialogs traversing the servers ? does the signalling
> > will
> > be replicated or synchronized between the servers or what ?!
> >
> > 2.What about the servers DB and how they should be designed in a
cluster
> > mode ? i want to replicate all the DBs
of the server to get consistent
> > user
> > registration using the subscriber table for example.
> >
> > Thanks in advance and Best regards.
> >
> > _______________________________________________
> > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing
list
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--
Carsten Bock
CEO (Geschäftsführer)
ng-voice GmbH
Schomburgstr. 80
D-22767 Hamburg / Germany
http://www.ng-voice.com
mailto:carsten@ng-voice.com
Office +49 40 5247593-0
Fax +49 40 5247593-99
Sitz der Gesellschaft: Hamburg
Registergericht: Amtsgericht Hamburg, HRB 120189
Geschäftsführer: Carsten Bock
Ust-ID: DE279344284
Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
http://www.ng-voice.com/imprint/
_______________________________________________
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