[OpenSIPS-Users] [NEW] SDP codec manipulation feature

[Bogdan-Andrei Iancu]

Hi Brett,

as you probably already found out, you cannot (as proxy) say what codec 
is used in a call. You (as a proxy) see just the offerings (what codecs 
are available on each side) - after that, each side is free to select 
and use one of the offered codecs - so, only inspecting the RTP stream 
will provide you with the information regarding the used codec.

Regards,
Bogdan

Brett Nemeroff wrote:
> I don't really need codec manipulation so much as just knowing what 
> codec was used (yes in a PV). Not a list of available codecs, but 
> which codec was negotiated and used. I don't know SDP very well so I'm 
> not sure if that's immediately discernible. This example was given 
> earlier. Lets say I want to limit to 50 g729a dialogs to a particular IP.
>
> That's what I really want to use it for. I'd also really like to log 
> the codec on a per call basis in ACC.
> -Brett
>
>
> On Tue, Jul 28, 2009 at 2:54 AM, Bogdan-Andrei Iancu 
> <bogdan at voice-system.ro <mailto:bogdan at voice-system.ro>> wrote:
>
>     Hi Brett,
>
>     You mean an PV returning the list with all the available codecs ?
>
>     Regards,
>     Bogdan
>
>     Brett Nemeroff wrote:
>
>         Is there anyway to write to an AVP the negotiated codec?
>         That'd be good for CDR purposes. Would I need a bunch of
>         codec_exists in the on_reply route checking for 200 OK?
>
>         On Thu, Jul 23, 2009 at 4:46 AM, andrei dragus
>         <andreidragus at yahoo.com <mailto:andreidragus at yahoo.com>
>         <mailto:andreidragus at yahoo.com
>         <mailto:andreidragus at yahoo.com>>> wrote:
>
>
>            Hello,
>
>            Methods have been added for SDP codec manipulation in the
>         textops
>            module.
>            Please update your module if you wish to use them.
>
>            There are 4 methods:
>             codec_exists(name[,clock]); //test if a codec exists
>             codec_delete(name[,clock]); //delete a codec
>             codec_move_up(name[,clock]); //move a codec to the front
>         of the list
>             codec_move_down(name[,clock]);//move a codec to the back
>         of the list
>
>            Each of them can take a codec name and an optional clock
>            parameter. If the clock is unspecified all of the codecs
>         with that
>            name will match.
>
>            All of the methods will act on all streams from all sessions
>            inside the SDP.
>
>            You can use these methods one after another to get a
>         desired effect.
>            E.g. To make GSM the least prefered codec but GSM/8000 the most
>            prefered of all GSM codecs use:
>
>            codec_move_up("GSM","8000");
>            codec_move_down("GSM");
>
>            Once a codec was deleted it will not be detected by
>         codec_exists().
>
>            Feel free to test these methods and please report any bugs
>         you may
>            find.
>
>            Thanks,
>            Andrei.
>
>
>
>
>
>
>
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