Hi Mike,
I just downloaded the source from the Technote of which covers this topic:
www.dialogic.com/.../pm_hmp_win
And it recompiling to update the project to something newer, it worked as is from what I can tell. Made the outbound call and played the file. Something else may not be right on your side someplace else.
What were you making the phone call to? A soft of hard SIP phone?
I would just say to make sure the correct box is checked for the IP address intended to be used for RTP streaming (on the system) from the "default IP address" tab of the HMP device property sheet in the DCM.
Jeff