c++ TAPI functions

I want to write a program which has, as a module, some TAPI functions. These functions must be ready made to use in my bigger program. Their task is to listen to DTMF tones on the phoneline for as long as the calling function requests this. This could be many hours, and give back the translation of each of those telephone tones as digit to the calling function, who deals with these values. ## Deliverables 1) Complete and fully-functional working program(s) in source code of all work done. 2) Complete ownership and distribution copyrights to all work purchased. ## Platform Windows XP