Tunnel Port 5090 UDP and TCP required for Windows Softphone

[the53]

I was having an issue with one way audio from the Windows Softphone and Browser extension when connected via the Tunnel port 5090.
The issue did not affect the IOS or android Apps, only the Windows App / browser extension.
I found a post from another user who had found the needed Port 5090 UDP inbound to the 3CX to be enabled to allow the Audio from the windows softphone to the 3CX Server, all other call handling and Audio worked fine.
With the older Windows Softphone and the IOS and Android softphones we only needed TCP Port 5090 for the tunnel to work.
Why oh why did 3CX decide to put a single direction of Audio on the Windows Softphone over UDP 5090 ????
I wasted hours sorting this out

 

[ChrisC_3CX]

Please bear in mind that the 3CX PBX always required TCP & UDP port 5090 and has always been listed in our port requirements here: https://www.3cx.com/docs/ports/