Hello, I came across this problem for the second time the first time I redid all the freepbx and put a backup more antipo because I thought it could be something I had done later.
But now the problem is similar, before he made calls every second without overloading the server and generating several audio files.
Now it has created the same problem but only outside of office hours.
If the log lines show legit calls, then your trunk is misconfigured and incoming calls are showing up as anonymous. Otherwise, you have SIP ports open to the world and with anonymous calls enabled every anonymous INVITE from the internet goes to your inbound routes.