Having a single field or multiple fields is the problem as there will be multiple call attempts with varying outcomes.
You should create a child table for these call attempts and vase your report off that. You can easily initialize this child table by exporting the relevant fields (perhaps just the Record ID# field ands the date field) and then importing that into he child table, mapping the [Record ID#] field into the field for Related Parent.
Fo your reporting, you can add lookup fields down to the child call Attempts table.