Solved Web meeting users cannot hear dial in users

[avmt]

On a web meeting, the users cannot listen the dial in users but they can listenthe web meeting ones. Meaning that dial in users can listen but cant talk.
I have checked and v15 RTP ports are open (UDP 9000-10999) - 3CX webpage (I cannot find a v16 port list)

Is there something we have to add for v16?
Is there any other thing to check so we can solve it?

Thanks in advance

 

[treefiddy]

Did you run the firewall test and pass?

 

[avmt]

Yes, firewall test passed.

 

[avmt]

I dont have the issue anymore. I didn't changed anything, just started working.