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/ _______________________________________________ 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
