I've reached 2000 simultaneous calls on a Dell Blade showing 40 CPU cores in /proc/cpuinfo , transcoding opus@8000h <-> PCMA with FS. Two years ago. If you want to encode FEC you'll need to use opus@8000h as codec_string or tweak the config settings in the xml to set the encoder in Narrowband audio . opus@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@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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