Who Dialled this Number?

Have you ever received a telephone bill with an unfamiliar frequently dialled number and which may also have a high cost associated to it? Or perhaps you’ve been contacted by somebody asking who within your company is dialling a specific number. Is it misuse or even fraud?
Run a report looking at the specific dialled number and include the fields to show who is dialling it, the duration and the cost. This can also be done on area code or country code and would include mobiles and any premium rated calls.