The billing section found in the navigation menu is where you can download monthly bills, and see an itemised list of all calls.
When you reach the Billing page, select a month from the dropdown menu.
When a month has been selected, all calls made within that month will appear. You can choose to view by:
Per-Extension Summary - amount of billable calls and total cost for each extension
Itemised Call - details of all calls
The report can be downloaded by selecting 'Download CSV' or 'CSV Ultrasoft'. These will save to your download folder.