In my opinion, it looks like a port scan coming from IP 37.219.130.250 to any possible ports to check services.
Maybe nmap or Nessus?
I think NetTalk is not gonna have any problems handling that, but is good idea to check other possible services from your host exposed to the internet (SMTP servers, telnet or FTP servers for example), to make it more secure and peace of mind.
Cheers