[OpenSIPS-Users] Transcode DTMF specific telephone-event

[Răzvan Crainea]

Hi, Vinayak!

OpenSIPS does not do transcoding, RTPEngine does it, OpenSIPS simply 
passes in SDP whatever RTPengine was instructed to do.
If I understand your question, you want want to keep the two DTMF codecs 
on the offering side, but offer a new one (101) on the other side. I've 
never done this, but what I would try is to first mask the offered 
codecs, and transcode the one I want. This would result in the following 
parameters:

rtpengine_offer("codec-mask-telephone-event/8000 
codec-mask-telephone-event/16000 transcode-telephone-event/8000");

Posting the inbound and outbound SDPs might be helpful in case this does 
not work. But again, I am no expert in trans-coding and/or RTPengine, 
this is just what I would try myself.

Best regards,
Răzvan

On 9/24/24 9:00 AM, Bogdan-Andrei Iancu wrote:
> Hi, This sounds more like an rtpengine question, rather than an opensips 
> one :(. Hopefully someone here will be able to assist, you never know :)
> 
> Regards,
> 
> Bogdan-Andrei Iancu
> 
> OpenSIPS Founder and Developer
>    https://www.opensips-solutions.com
>    https://www.siphub.com
> 
> On 07.09.2024 09:46, Vinayak Makwana via Users wrote:
>> Hi all,
>>
>>            I am trying to transcoding for a specific 
>> DTMF telephone-event from opensips +rtpengine. I am using opensips 
>> 3.2.12.
>>
>> Here's Call scenario :
>> Initial INVITE SDP ---> OpenSIPS
>> *       a=rtpmap:105 telephone-event/16000
>>        a=rtpmap:100 telephone-event/8000*
>>
>> From opensips i want to add below DTMF payload 101 because B party is 
>> accepting this DTMF payload type.
>> *a=rtpmap:101 telephone-event/8000 *i am using below code.
>> *       rtpengine_offer("transcode-telephone-event/8000");*
>>
>> By using this function opensips does not transcode specific DTMF 
>> payload 101.
>>
>> Is there any way to achieve this transcoding ?
>> Please let me know.
>>
>>
>> Regards,
>> Vinayak Makwana
>>
>>
>>
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-- 
Răzvan Crainea
OpenSIPS Core Developer
   http://www.opensips-solutions.com