Not trying to influence your decision, but how do you connect to the internet? Is it DSL, Cable, Satellite, etc? The reason I ask is because if you are on DSL and have the capability to put your modem in the bridge mode you may not need to bypass your router. I've been running my modem in the bridge mode with my router hosting the internet connection since the very beginning. I used Vonage for 3 years and now SIP for a little over a year and have never had a problem with NAT / One Way audio. Just a thought.