[apinkel]

I'm guessing your pbx is using a codec not supported on WM... there are a number of codecs allowed by the wav file format. I'm guessing there are tools out there to help you determine what codec you pbx is using... audacity might give the info you need (free audio editing software).

If you can determine the codec, hopefully there will be a codec you can download and install on your TP to get it all working.