[OpenSIPS-Users] codec manipulation feature

[andrei dragus]

Hi Jeff,

This is Andrei. I am currently working on this right now. It should be finished in a couple of days if nothing comes up.

Andrei.

--- On Wed, 7/22/09, Jeff Pyle <jpyle at fidelityvoice.com> wrote:


> Just curious if you had a chance to see what the status is
> of this SDP
> manipulation code.
>
>
> Thanks,
> Jeff
>
>
>
> On 6/15/09 6:36 PM, "Bogdan-Andrei Iancu" <bogdan at voice-system.ro>
> wrote:
>
> > 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,
> >>
> >> 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" <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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