Bad sound with Opus codec on T21 and T40

[jolouis]

(12-08-2017 10:56 AM)TrK Wrote:  Asterisk console show calls established using opus (with opus->slin and slin->opus conversion actually).

Well there's your first problem. If you are calling two devices with OPUS enabled, Asterisk should be passing the codec through directly and not doing any type of conversion.

The fact that it is doing Opus - slin then slin -> Opus indicates that Asterisk is trying to process audio on the call for some reason. Now if you have installed everything properly and system is all running fine then you should not have any issues doing that, but I would suggest doing some digging on your PBX side to find out why the call is not simply being passed through as that may be the bigger point of the issue. (i.e. if you have call recording enabled on the PBX, then this will happen and maybe your PBX is not powerful enough to do both the recording to disk and the 2 x OPUS translation? That's just one possibility of many...)