Despite the existence of Perian and Flip4Mac, there are no native options for getting Windows Media 9 Voice Codecs working over streaming (mms) sessions. I spent some time Saturday night trying to get it to work with VLC, MPlayer, QuickTime Player and the now-unsupported Rosetta-only Microsoft Windows Media Player 9 for OS X. Video managed to show up (it was encoded differently) in various programs, but no audio (NOTE: Rosetta WMP 9 kinda worked off and on, but kept dying enough to make it not an option).

The solution was to grab Crossover Mac and get Microsoft's Windows version of WMP 9 working in it. (NOTE: you *could* just use Windows under Parallels, VMware or BootCamp, but that has a significant cost associated with it. The price of a Crossover license is much more palatable for may people.)