The built-in CDR reports are indeed quite helpful. Though, I find them also quite confusing. When looking at the overall list of calls I’ll see the same call listed multiple times - all entries having the same SystemID. Clicking on the details of that SystemID doesn’t make it any more clear as to why its listed multiple times in the overall report.
Here’s an example from a recent CDR report showing the list of calls (not the call detail)
Your help is much appreciated.