The Structured Fax File format is the normative file format for storing Group 3 fax documents in an environment based on the COMMON-ISDN-API (CAPI) standard.
The default extension for Structured Fax Files is SFF.
Supporting Platforms and Applications
This format is mainly used for transfer of fax documents in Microsoft Windows applications.
PMView will read and write SFF files in accordance with the COMMON-ISDN-API (CAPI) version 2.0 specification (4th edition).