I have a S100 with Yealink 42S handsets
I had a TL R600 in front of it and was having one way audio once in a while at the customer end.
I removed the router as a test and have the Yeastar with the WAM right into it
The problem is still there so I have the S100 with INTERNET right into the WAM and still getting one way audio on some calls at the caller end
Any Idea's on where I would look