When processing calls the Voicesafe displays only the data it receives as part of the call.
This data includes the number making the call.
If the phone system has been configured to display the same number irrelevant of the extension making the call then all outbound calls will appear as the same number. When this is the case the search page will look like the below.
If you would like to see which extension is making a call, then caller display will need to be enabled on the extensions you wish to view on your phone system. Once caller display is enabled this will be viewable from the search page.