They are "WARNING"s not “ERROR”'s and I I believe a well configured FPBX/firewall should not be accepting ‘anonymous’ endpoints, so that would likely be a firewall/configuration problem unless you have mis-configured endpoints in Romania
whois -h whois.cymru.com " -v -b 193.46.255.251" 130 ↵
AS | IP | BGP Prefix | CC | Registry | AS Name
47890 | 193.46.255.251 | 193.46.255.0/24 | RO | ripencc | UNMANAGED-DEDICATED-SERVERS, GB
But it further is an indication of why your log files are so big.