One way audio - called person cannot hear me

[forumuser1966]

The 3x phone system runs without problems since 1.1.2023.
Suddenly since today 9h the called person cannot hear the caller, the caller can hear the called person.

What I did:
- restarted the firewall
- updated to newest version of 3cx 18.0 (Build 908)
- restarted 3cx phone system (several times)
- firewall check is ok, no problems

What can I do?
Thanx for any hints.

 

[Nathan@Voxtelesys]

Are these extension to extension calls or external calls? And do both types of calls have one way audio issues?

Are you using desk phones or soft client?