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 <cars...@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 <b...@langfeld.co.uk>: > > On 27 December 2014 at 23:44, Carsten Bock <cars...@ng-voice.com> wrote: > >> > >> 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 > handle > > 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.b...@gmail.com>: > >> > 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 > >> > sr-users@lists.sip-router.org > >> > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > >> > > >> > >> > >> > >> -- > >> Carsten Bock > >> CEO (Geschäftsführer) > >> > >> ng-voice GmbH > >> Schomburgstr. 80 > >> D-22767 Hamburg / Germany > >> > >> http://www.ng-voice.com > >> mailto:cars...@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/ > >> > >> _______________________________________________ > >> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > >> sr-users@lists.sip-router.org > >> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > > > > > > > > _______________________________________________ > > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > > sr-users@lists.sip-router.org > > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > > > > > > -- > Carsten Bock > CEO (Geschäftsführer) > > ng-voice GmbH > Schomburgstr. 80 > D-22767 Hamburg / Germany > > http://www.ng-voice.com > mailto:cars...@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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