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| Column header | Description |
|---|---|
| Account | The account code associated with this cost summary. |
| Extension Group | The name of the extension group. |
| Total calls received | The total number of calls received by this account code/extension group. |
| Total calls made | The total number of calls made by this account code/extension group. |
| Professional cost | The markup charge that has been added to the cost of calls for the associated account code/extension group. |
| Call cost | The total cost of calls excluding any mark-up charges. |
| Total cost | The total cost of calls including any mark-up charges. |