Multiple Calls From "VoIP User (User)"

[Drew9213]

I have a phone system in place that is receiving 20 to 30 calls per day from "VoIP User" that disconnect immediately. I have looked through the call logs and activity reports but can't seem to find an originating IP address for the call or any other explanation for what this is. Anybody have any ideas or answers?

 

[leejor]

Does the Activity Log show anything? Do the calls end up going direct to a set? Are they coming in on a trunk? Direct SIP calls?