asterisk users - Dec 2010 - How to use google voice for voicemail transcription

No, I don't know how to do this. Does anybody?

I'd like to take a voicemail file from asterisk (*.wav, *.gsm, *.mp3  ?) 
and send it to googlevoice as a voicemail, then get the transcription 
over gmail.

I know about pygooglevoice (is it still maintained?). But I can't figure 
out how to dial gv and leave a message (robo dial??) from a system command.

This would allow me to get transcriptions of voicemails left on asterisk.

Anybody know how to do this? Or doing it?

sean