You're over thinking this. The 202 works in router mode by default, leave it that way, don't change it to bridge mode, just do not configure anything for the router (that is not already set as defaults) and don't plug anything into the LAN port. Let your powerful Netgear router do all the routing for your network, and let the Obi do it's thing being an ATA.
Yes, you can still assign the 202 a static ip address. While there are a few exceptions, almost everyone on here finds they do not have to setup any port forwarding nor do they have to create any specific rules based on services or ports to make the Obi work as intended. Collective experience on here proves this is the best approach, try it yourself and observe your Obi's voice quality and performance as a base case, then after a few days or weeks start tweaking to see if your tweaks make any difference.
The VoIP quality tests mentioned here might help you get started when you do get to tweaking:
http://www.obitalk.com/forum/index.php?topic=5803.msg37497#msg37497