How the corresponding report actually groups & collates statistics by telephone number is specifically affected by the value of the "Call Type / Direction" field within the Filter tab as follows:
External Call Types
When the "External Only", "External (Inbound)", "External (Outbound)", or "External Trunk-To-Trunk" call type filter options are selected, the report displays a list of the outside telephone numbers that external calls have either originated from or been made to. For example, inbound trunk calls containing CLI/CallerID are shown as inbound calls from the corresponding number, and calls made to external public numbers are shown as outbound calls. This is the main intended usage for the report type, where the corresponding report groups by external telephone numbers only.
All Other Call Type Filtering Options
Note that on Akixi 3000 configurations, this report can also be enabled to display email and LiveChat contact item statistics, assuming the correct Omnichannel integrations have been configured by the administrative user. This works much the same way as with calls, and will show statistical information for emails and LiveChat items against any corresponding ID.