The system calculates four types of tiered rating. One using the Minutes rating method, one using Occurrences, one using Total Occurrences, and one using Total Count.
Minutes rating method: Usage in each tier is rated individually. When one tier is full, any additional minutes are rated at the next tier level. (Used for seconds-based usage types only)
Occurrences rating: Usage in each tier is rated individually. When one tier is full, any additional minutes are rated at the next tier level. (Used for occurrence-based usage types only)
Total Occurrences rating: Usage is totaled just before billing and that total determines which tiered rate is used for all usage. (Used for occurrence-based usage types only)
Total Count rating: Usage records are counted just before billing and that count determines which tiered rate is used for all usage. (Can be used for all three usage types: seconds-based, occurrence-based, and percentage-based.)
Tiered rating only occurs during re-rating. The system knows when calls that need to be re-rated have been loaded and re-rates before billing, if necessary.