Transmitted Page Count in GET Message Store API

When calling the GET Message Store API endpoint, if the fax failed to transmit completely, I want to know how many pages were transmitted successfully so I can retransmit the document with no repeated pages and also limit my future transmissions to page counts the recipient can handle.

The GET Message Store call contains a "faxPageCount" field which contains the number of pages that were attempted to transmit, however, when the transmission fails mid transmission, I expect for some field to surface how many pages were successfully transmitted, not just the full document page count.