Recommendation T.37 describes the technical features necessary for the Store-and-Forward "Simple" mode of operation of facsimile document transmission via Internet Mail. The general guidelines for the modes of operation of facsimile over the Internet are contained in Recommendation F.185.
ITU-T T.37 SPANISH-1998 history
1998ITU-T T.37 SPANISH-1998 Procedures for the transfer of facsimile data via store-and-forward on the Internet