[SR-Users] RTPengine - Transcoding example available?

[Gopalakrishnan N]

Yes correct. RTP is good since the OPUS codec is available in both the
sides its getting negotiated. Change your config in side A to take only
PCMA effective.

On Tue, 20 Feb 2018 at 18:05 Denys Pozniak <denys.pozniak at crazycall.com>
wrote:

> Thank you for the answer, but from "SDP" point of view everything looks
> OK, I think issue is with my config or transcoding engine:
>
> Side A INVITE-> Proxy/Rtpengine:
>
> v=0
> o=- 3543840537 1 IN IP4
> s=SIPPER for PhonerLite
> c=IN IP4 side_a
> t=0 0
> m=audio 55062 RTP/AVP 107 8
> a=rtpmap:107 opus/48000/2
> a=rtpmap:8 PCMA/8000
> a=ssrc:1792443851
> a=sendrecv
>
> Proxy/Rtpengine OK -> Side A:
>
> v=0
> o=- 3728121777 3728121778 IN IP4
> s=pjmedia
> b=AS:50
> t=0 0
> a=X-nat:0
> m=audio 30254 RTP/AVP 8
> c=IN IP4 rtpengine
> b=TIAS:32000
> a=rtpmap:8 PCMA/8000
> a=sendrecv
> a=rtcp:30255
>
> So here must be PCMA in direction from  Proxy/Rtpengine -> Side A, but I
> have opus.
>
>
>
>
>
>
>
> On 20 February 2018 at 12:41, Gopalakrishnan N <saigop at gmail.com> wrote:
>
>> Hi Denys,
>>
>> Am not much user of Kamilio, but am from Telecom background. The reason
>> for your case is, in side A you have OPUS and in side B already OPUS is
>> available and since both has the same codec as first priority it will
>> negotiate itself with same codec and then it will look for other priority.
>> Remove OPUS from side A and it will automatically go into transcoding mode.
>>
>> On Tue, 20 Feb 2018 at 16:17 Denys Pozniak <denys.pozniak at crazycall.com>
>> wrote:
>>
>>> Hello!
>>>
>>> Please explain how to achive next:
>>>
>>> Side A supports:
>>> OPUS
>>> PCMA
>>>
>>> Side B supports:
>>> OPUS
>>> PCMA
>>> PCMU
>>>
>>> I need to transcode in direction A->B from PCMA to OPUS?
>>> So should be like this:
>>> A(PCMA) -> (PCMA)Rtpengine(OPUS)->B(OPUS)
>>>
>>> I configured like this:
>>> rtpengine_offer("codec-mask-PCMA codec-transcode-opus");
>>> rtpengine_answer("codec-mask-opus codec-transcode-PCMA");
>>>
>>> But leg from Rtpengine to A has wrong codec (OPUS):
>>> https://drive.google.com/file/d/14GAIt8lL7Igj9S95b_RS6CXtmGVhjLa1/view
>>>
>>>
>>>
>>>
>>> On 19 February 2018 at 13:56, Richard Fuchs <rfuchs at sipwise.com> wrote:
>>>
>>>> On 2018-02-19 05:48 AM, Denys Pozniak wrote:
>>>>
>>>>> Hello!
>>>>>
>>>>> Small note.
>>>>> In case of opus use: codec-transcode-opus (opus is lowercase).
>>>>>
>>>>
>>>> As explained in the readme, the format generally follows the SDP
>>>> format, including specifying sample rate and number of channels. As an
>>>> additional parameter, the bitrate can be specified for codecs that support
>>>> it.
>>>>
>>>> Examples:
>>>>
>>>> transcode-speex/32000
>>>>
>>>> transcode-opus/48000/2/64000
>>>>
>>>>
>>>> Cheers
>>>>
>>>> _______________________________________________
>>>> Kamailio (SER) - Users Mailing List
>>>> sr-users at lists.kamailio.org
>>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>>
>>>
>>>
>>>
>>> --
>>>
>>> BR
>>> Denys Pozniak
>>> _______________________________________________
>>> Kamailio (SER) - Users Mailing List
>>> sr-users at lists.kamailio.org
>>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>>
>>
>> _______________________________________________
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>> sr-users at lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
>>
>
>
> --
>
> BR
> Denys Pozniak
> _______________________________________________
> Kamailio (SER) - Users Mailing List
> sr-users at lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
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