TAPI and UniModem Considerations

The Modem Manager does not interface directly with modems; instead, it uses the system-provided telephony interface, TAPI. This allows VTS to share modems with other TAPI-compliant applications, such as RAS services, FAX services, and so forth.

All TAPI modems share the same driver called UniModem. When a modem manufacturer's driver is installed, what actually happens is that an .inf file is processed, and a number of registry entries, understandable by UniModem, are added.