Jalmar TAPI Conversion x32 to x64

We currently have a working and robust 32 bit TAPI (TSP) driver used with our PBX solutions. It is a Jalmar Coded TAPI written in what I beleave is C++. The actual TAPI unit works great on 32bit operating systems like XPPro. What we need is someone who knows what there doing to convert our existing build x32 TAPI to an x64 version of TAPI for Windows 7 etc