That was pretty simple! I'll do a wiki writeup and get the files to a dev for review/submission to SVN.
dlewis: The setup between Gizmo/GV is built into Gizmo5 now, you just go to their homepage and sign into your account, on your profile there is now an option to route all outbound calls through your GV line. Then in GV you just add your Gizmo line as a forwarding line and you're good to go. Super easy to do it now, but they limit calls to 20 minutes at a time. I can deal with that as I never really need to talk to anyone that long and if my 20 minutes is up, I just call right back.
Been testing since last weekend and so far the service is great, much better than my previous setups using my PSTN line and MagicJack.