[Freeswitch-users] OPUS Codec

[Oancea, Dragos]

I've reached 2000 simultaneous calls on a Dell Blade showing 40 CPU cores
in /proc/cpuinfo , transcoding opus at 8000h <-> PCMA with FS. Two years ago.
If you want to encode FEC you'll need to use opus at 8000h as codec_string or
tweak the config settings in the xml to set the encoder in Narrowband audio
.
opus at 16000h (newly added) should work with encoding FEC too.
When you prepare your setup use CLI command opus_debug and netem to
introduce packet loss, this way you'll be sure if the phones are sending
FEC or not.
Some may try to vary the bitrate to a value where the opus encoder simply
does not encode FEC. Freeswitch, just like WebRTC stack sets by default the
encoder in Fullband , which is CELT mode, and there's no FEC there.
It's all in the doc Giacomo shown.

Cheers,
Dragos


On Wed, May 3, 2017 at 8:16 AM, EL <fs.user at fordior.net> wrote:

>
> Yealink is supporting OPUS on several other models since firmware
> V81:
>
> Quote:
> "We will support opus on the standard V81 of
> SIP-T40P/T23P/T23G/T2 1(P) E2/T19(P) E2."
>
> Source: http://forum.yealink.com/forum/showthread.php?tid=
> 29650&pid=51262&mode=threaded
>
> I can confirm OPUS implementation on the 'T21P E2' model.
>
> --
> EL
>
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