where to start IVR development

hi,
i want to build a simple IVR system. i know TAPI can be used in such a
system, but im looking for some API which can run in UNIX as well. is
there such an API?
if i choose to use TAPI from MS, what kind of hardware resources would
i need? Can i run and test applications that use TAPI using a modem
and a phone line only? this is because im doing this as a personnel
project.

thanks
.

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