henningw left a comment (kamailio/kamailio#4250)
It got a bit confusing for me, so I tried to summarize the different cases:
1. INVITE between phones A-Proxy-B, no ACK logging in local request event route for 200 OK and non 200 OK
This seems to be working as expected with the PR according to the tests.
3. INVITE generated between Proxy - B with 200 OK, ACK logging in local request event route
This seems to be working according the tests from @tsearle and @xkaraman
5. INVITE generated between Proxy - B with non 200 OK, ACK logging in local request event route
This seems to be not working according to the tests from @xkaraman, @tsearle can you also confirm?