[asterisk-bugs] [JIRA] (ASTERISK-27675) Feature Request: Single Codec in Response

[Kristijan Vrban (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=242200#comment-242200 ] 

Kristijan Vrban commented on ASTERISK-27675:
--------------------------------------------

Shoud be doable with PJSIP_MEDIA_OFFER? Call from handsets  with AMR AND AMRWB, then set AMRWB via PJSIP_MEDIA_OFFER. Call with only AMR OR AMRWB, set  AMR OR AMRWB via PJSIP_MEDIA_OFFER.
Not tested, but theoretical this is what you are looking for?

> Feature Request: Single Codec in Response
> -----------------------------------------
>
>                 Key: ASTERISK-27675
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27675
>             Project: Asterisk
>          Issue Type: Improvement
>      Security Level: None
>          Components: Channels/chan_pjsip
>    Affects Versions: 13.15.0
>         Environment: Debian 9
>            Reporter: Carsten Bock
>            Severity: Minor
>              Labels: pjsip
>
> Hi,
> as you may know, we love IMS. And we love using Asterisk (PJSIP) with IMS, as it makes our life easier... :-) Chan_pjsip does a great job!
> However, we have a compatibility issue:
> In our Lab-Setup, we use Asterisk as a B2BUA between VoLTE handsets and the "rest of the world". The VoLTE handsets usually speak AMR-Codecs, while in the rest of the world we use G711/G722. So Asterisk needs to do Transcoding, which it does great.
> In our setup we have:
> disallow=all
> allow=g722
> allow=amr
> allow=amrwb
> allow=ulaw
> allow=alaw
> Call comes in (with AMR / AMRWB) and goes out with G722, AMR, AMRWB, G711. Reply comes in as G722, and reply goes out with AMR and AMRWB. While I believe it is technically correct to reply with both codecs, it confuses our Lab-Samsung Handsets, so we simply get "no audio" instead of anything else.
> If I comment either AMR or AMRWB, the reply contains only one codec and the phone is happy.
> It would be desirable, to have an option to always only have one codec in the reply instead of all compatible ones.
> Of course we've raised the issue with Samsung, but it takes them ages to fix this.
> Thanks,
> Carsten



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