The symptoms :
Phones will ring with 100,1000, or 10000 as the caller-ID and no one will be on the other end.
It could happen just once just like it could happen many times a day, every day.
Inspecting the logs of your phone system or voip provider will not show these calls at all.
These calls are being mass made by a so called “sip auditing tool” called SipVicious. It will scan en...