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Typically, a Call data record file or CDR contains the following fields :-
- Date and Time of the individual call
- Number called
- Duration of the call
These are sufficient to be able to create a charge for the call.
However, some companies, such as Cable & Wireless, add extra fields, which make this calculation simpler and quicker to perform and much easier to maintain :-
- Cost code of the call
- Destination of the call as a description
- Cost of the call
The latter is particularly useful in a Billing System as it enables a margin to be calculated.
The rating algorithm for the Billing System is particularly powerful and has features not found in many other systems :-
- The charge can be calculated exactly to a fixed number of decimal places, applying rounding as required. (Note that BT's rounding is customer-friendly!)
- A flexible minimum charge can be applied.
- Calls can be transferred from one sub-account to another in cases where each account has more than one sub-account.
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