[Freeswitch-users] OPUS - is FS ignoring incoming FAC packets?

Dragos Oancea dragos at freeswitch.org
Wed Jan 26 18:39:39 UTC 2022


Short answer: No.

If the client sends FEC packets AND there is packet loss AND FS finds in JB
needed FEC for the missing seq, then it will use it.

It will show in CLI with  "opus_debug on" when it's doing it.




On Wed, Jan 26, 2022 at 7:58 PM David Villasmil <
david.villasmil.work at gmail.com> wrote:

> Hello all,
> Wondering if anyone's seen this scenario:
>
> With 15% packet loss, FEC enabled.
>
> - sip -> pstn:
>   -- We're seeing FEC out and in
>   * client (OPUS) --> FS --> (PCMU/A) B-leg - Result: Choppy Audio
>   * client (OPUS) <-- FS <-- (PCMU/A) B-leg - Result: Very good audio
>
>   * client (OPUS) --> FS --> client (OPUS) - Result: Very good audio
>   * client (OPUS) <-- FS <-- client (OPUS) - Result: Very good audio
>
> It's like FS is ignoring the incoming FEC when transcoding.
> I have a small jitterbuffer 20:100:20
>
> Any ideas?
>
>
> David Villasmil
> email: david.villasmil.work at gmail.com
> phone: +34669448337
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