One of our client wants to know who is maliciously calling her but everytime the phone (7940G) rings, it only displayed "unknown number" or "external call". When I look at the CDR, there's no number for external call only calls from internal which of course I don't need. I also used the CAR's Malicious Call Details but no results. Can someone suggest a free tool or plugin for this?
We got CCM 4.1(3)sr3a.