I signed up for another Google Voice account, and went to simonics to register it so I could use it on a SIP adapter. Registration was closed. :(
Asterisk 11 just hit and it's chan_motif does the job. Asterisk is very ... intimidating at first. It can do soooo much. My initial setup wasn't dialing out for some reason. It seems to be working fine now on my VPS and I've narrowed it down to a few modules, so that I may compile and run it directly on my home router (NETGEAR WNDR3700).
Click more to see a dump of my configuration …