[OpenSIPS-Users] codec manipulation feature

[Bogdan-Andrei Iancu]

Hi Jeff,

Andrei, the author of the memchached module is working on this right 
now. I guess this will be ready soon ;)

Regards,
Bogdan

Jeff Pyle wrote:
> Hi Bogdan,
>
> 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
>>>>>           
>
>
>