Increase Quality of UE4 Voice Chat

Hey all,
i wonder if anyone can help me figuring out on how to improve the audio quality of the opus integration.
I use it in a LAN environment and still it has a volume treshold to detect speech and some stuttering here and there.
I have a lot of bandwith and would like to increase the quality.

Building engine from source, so i have access to the voice integration files. There are a few variables but i dont see any documentation and just trying them one by one doesnt seem to affect much.

I already increased all possible values in the Inis that may affect bandwith limitations.

Fixed with 4.21. There are some settings that you can do in the config files.

Would you mind to share them?

can u please share the config? I will be grateful