Hi Bogdan, It¹s been a little while since we talked about this. I was wondering if there was anything in the works to detect and/or manipulate the codecs present in an SDP.
- Jeff On 2/1/09 4:08 AM, "Steve Kurzeja" <[email protected]> wrote: > This idea is quite standard in SBCs, typically called codec profiles, where > you permit only certain codecs to be passed through the SBC in an INVITE and > all the rest are stripped out. > > We use it to get around interop issues with certain codecs. E.g. we have some > end devices/customers that have issues using g729a so we choose to remove this > codec for these specific endpoints. > > The poor man's method to implementing this is just doing header manipulations > in the SDP but it would be nice to be standardized. > > Regards, > Steve > > > On Fri, Jan 30, 2009 at 2:20 AM, Jeff Pyle <[email protected]> wrote: >> Hi Bogdan, >> >> I'm looking for the ability to selectively remove codec advertisements from >> the SDP. For example, if my customer sends a call to me for PSTN >> termination he may advertise G711 and G729, with G711 preferred. By looking >> at the number of existing dialogs I may know that he's running low on >> bandwidth, so I would like to suppress the G711 advertisement ultimately >> causing a 200 OK from the carrier with G729. >> >> Generically, in this application we're looking only to suppress G711 at >> certain times. >> >> I understand normally codec selection is done completely by the gateway >> device. However, my gateway devices aren't smart enough to take bandwidth >> utilization into consideration when choosing which codecs to advertise. I'm >> hoping my proxy might be. :) >> >> Does that make sense? >> >> >> >> - Jeff >> >> >> >> On 1/29/09 5:04 AM, "Bogdan-Andrei Iancu" <[email protected]> wrote: >> >>> > Hi Jeff, >>> > >>> > right now there is only available some functionality to check the codecs >>> > (to see what codecs are advertised in the SDP)... What exactly are you >>> > looking for (like codec ops) ? >>> > >>> > Regards, >>> > Bogdan >>> > >>> > Jeff Pyle wrote: >>>> >> Bogdan, >>>> >> >>>> >> Some months back you mentioned an upcoming feature that would allow >>>> >> Opensips to manipulate the codecs present in the SDP. Just wondering >>>> >> if there is anything available to test yet. This feature, in >>>> >> combination with dialog contexts, will be of great use to us to allow >>>> >> us to take a guess at the bandwidth consumption for a particular >>>> >> customer and force the use of a compressed codec if necessary. >>>> >> >>>> >> >>>> >> Thanks, >>>> >> Jeff >>> > >> >> >> _______________________________________________ >> Users mailing list >> [email protected] >> http://lists.opensips.org/cgi-bin/mailman/listinfo/users > >
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