calls

[_pi]

You don't need dlls or typelibs. Read TAPI reference in MSDN library and use the functions.

Also Windows has TAPI type library. It should be simpler to use but I don't know where documented.
Macro

Code:

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typelib TAPI3Lib {21D6D480-A88B-11D0-83DD-00AA003CCABD} 1.0
TAPI3Lib.RequestMakeCall r._create
r.MakeCall("123456789" "qm" "test" "")
;don't know if something like this will work

that works for me.