capircvd is a voice/fax gateway. It receives fax (G3) and voice-calls using an ISDN-Bus, an AVM ISDN-Card (active or passive) and CAPI20 from isdn4linux, or AVM. It can be used on either P2P (with DDI) or P2M S0-bus. After reception, it can process files (send as mail) using an external handler (included).
SffTools consists of SffToBmp, a little utility that converts Structured Fax Files to BMP, PBM, JPEG, or single- and multipage TIFF format, and SffView, a GUI viewer for those files. The tools should be especially useful to people who are faxing with ISDN cards because the CAPI interface of these cards generates such files. CAPI support for Linux is available for the active card AVM B1 and the passive card AVM Fritz!.
CapiSuite is an ISDN telecommunication suite providing easy-to-use telecommunication functions which can be controlled from Python scripts. It uses a CAPI-compatible driver for accessing the ISDN-hardware, so you'll need a CAPI-compatible driver. CapiSuite is distributed with two example scripts for call incoming handling and fax sending. They provide a multi-user answering machine with fax recognition, remote inquiry, and fax receiving/sending functions.