Except I have no clue in hell where to start.
Are there any websites that help with this? I used to use portforward.com, but I don't think they have Ooma listed there. If you have successfully forwarded your ports, please give some advice.
If you want to forward ports individually, you can on the same setup page referenced in the link.
modem --> router --> ooma OR
modem --> ooma --> router
If the latter, then you don't need to change anything on your router port forward settings. Just go into your ooma setup url http://setup.ooma.com and change your DHCP Configuration to be the same for both Start and End Addresses, 172.27.35.x. Enter this same address in the DMZ line and click Update. Reboot your router, so it will take the new address assigned by ooma.
I noticed Groundhound was already ahead of me on this..