[arm-allstar] Is OPUS CODEC supported?

[David McGough]

Interesting?  I'm surprised an FCC complaint was successful in resolving 
ISP quality issues?  I didn't realize the FCC regulated this?

I'm experimenting with an "aggressive"  FEC layer tunneled in UDP packets.  
The goal is to minimize packet loss related audio blips.  The trade-off is
more bandwidth use, of course.  I'm targeting the types of scenarios found 
on WiFi networks where there is usually plenty of bandwidth, but QoS isn't 
great, regularly loosing packets here and there.

The problem in asterisk 1.4.x and all but (perhaps) the very latest
versions is that the IAX2 protocol implements variable jitter buffering.  
This messes with the FEC mechanisms in various CODECs, like iLBC.  For
example, iLBC independently from asterisk seems to perform much better
than when used across an IAX2 link.....

A "deep dive" analysis of improving IAX2 is high on my To-Do list.


73, David K4FXC


On Sun, 15 May 2022, "tony dinkel via ARM-allstar" wrote:

> You are not going to fix packet loss with a codec. We used ILBC for a 
> little while, we thought it sounded better. But in the end, lost data is 
> still lost forever and still causes a dropout. An FCC complaint against 
> our provider, COX in Las Vegas is what finally got us some satisfaction.
> 
> You will have more luck fixing your link than with a different codec.
> 
> td
> wb6mie
> 
> 
> 
> >We are experiencing some packet loss over one of our microwave links and
> interested in trying a CODEC with forward error correction if one is
> supported.  A friend commented that Asterisk level 15 or beyond supports an
> OPUS CODEC.   I have no idea what level of Asterisk is supported by this
> software.   Information?
> 
> Tom Whiteside N5TW
> 
> 
> 
> 
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