said by Biker4:
After a couple of hours of testing we finally found that in the portal the codecs was tagged ALL as it should have been tagged only G.711U.
Believe it or not it was the only problem.
But it was working properly tagged as ALL since months.
That really should [not] be the issue.
If you seem to have fixed it that way, it may be a coincidence.
But----good luck/bonne chance.