[OpenSIPS-Users] codec manipulation feature

[Bogdan-Andrei Iancu]

Hi Jeff,

I have some code from last year - let me check it out and see what is 
the status.

Regards,
Bogdan

Jeff Pyle wrote:
> Hi Bogdan,
>
> It’s 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" <steve.kurzeja at gmail.com> 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
>     <jpyle at fidelityvoice.com> 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"
>         <bogdan at voice-system.ro> 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
>         >
>
>
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