Security Quesitions

General Help
1

I recently received a call from sipvicious? After doing some google research it seems to be a scanner that hit me.
The pbx I am using is at a remote location is there any extra security features I should attempt to research and try? Was
this a hack? Should I change port 5060?

Thanks

2

You were being scanned. Do you have your system open to the Internet?

I would recommend that you investigate a firewall to block unwanted access to your system.