Audio from just one side listening through the 3cx app

[ab7]

I'm having an audio problem using the 3cx app, from extension to extension, but if I use the webclient it works normally. The stranger that the person on the other side hears me but I don't hear him.
I've done the firewall test and test ok, reconfigured the extension, updated the 3cx app and the server to the latest v16 version. I redid all my firewall and ports and nothing worked. Until I restarted the server and it started working for a while, but the problem persists because it returns with the same problem has anyone ever been through this?

 

[Nico!]

Hi,

It's hard to pin the right thing without knowing the whole infrastructure, i can suggest a few things to help you but from experience it's most likely a firewall/routing issue anyway.

Can you hear yourself when you do the *777 echo test? https://www.3cx.com/blog/docs/echo-test/
Did you already tried to check "PBX Delivers Audio " in the options of the extension ?
Is the same problem happen on ios and android app ?
Do you hear both sides when you record audio on the 3CX ? (try to check "record all calls")