Hi Daniel, i believe in many setups (including mine and the Sipwise Systems) a SBC is always used as you described: Behind a Proxy. The Proxy does Flood-detection, advanced logic, Loadbalancing and so on and the SBC works only as simple B2B-UA for Transcoding and Topology hiding.
Kind regards, Carsten 2012/8/30 Daniel-Constantin Mierla <mico...@gmail.com>: > Hello, > > based on the outcome of the discussion carried in the thread: > > http://lists.sip-router.org/pipermail/sr-users/2012-August/074480.html > > I am looking again the clarify some aspects out there in the VoIP world. > > So, as mainly dealing with proxy/sip signaling deployments, it's very often > to be the first one hit by support issues claiming things don't work. Then > you investigate and end up in conclusions like in the above thread: > > "The problem was at the SBC, __where I did not expect it__." > > The underlined part heats me up a bit, because I never understood from where > it comes this perception that SBC is a MUST-TO-HAVE and the PERFECT (never > mistaken or breaking things) node in a VoIP networks. > > To some extent, the SBC is just a very costly SIP ALG, and a SIP ALG is > there to break the things. > > I don't want to start like a flame war, but is it something that I am > obviously missing in regards to what benefits a SBC can bring? I see only > inconveniences: > - another point of failure > - it is a b2bua, therefore very unlikely to offer the same performances of a > proxy > - if transcoding is needed, a media server can be used behind the proxy, > properly protected of attacks by the proxy and eventually deployed as a farm > load balanced by the proxy > - if topology hinding is wanted in the b2bua fashion (not the proxy fashion > with encoding headers), then the b2bua can be behind the proxy, properly > protected of attacks by the proxy and eventually deployed as a farm load > balanced by the proxy > - nat traversal was solved long time ago in proxy environment, being > scalable by deploying a farm of rtp proxy > > I don't want to go to other features, including the transport layer, it's a > clear win of the proxy in my experience (ok, being deep involved in this > project). > > Then, what makes the SBC so desirable in many companies/voip deployments? If > any SBC user here that can share, what was the reason to buy such a device? > Any conceptual functionality that cannot be achieved with the proxy as the > first hop in front of the (wild) clients? > > Cheers, > Daniel > > -- > Daniel-Constantin Mierla - http://www.asipto.com > http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda > Kamailio Advanced Training, Berlin, Nov 5-8, 2012 - http://asipto.com/u/kat > > > _______________________________________________ > 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 34927219 Fax +49 40 34927220 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
