I picked up the box today and after a little fiddling around with my firewall (the D-Link DI-604 that Verizon provides with it’s FIOS service) I figured out that in order to forward a range of ports you need to go to Advanced–>Firewall and add the following rules:

Name: Vonage 1
Source: WAN,*
Destination: LAN,<PAP2’s IP Address>
Protocol: UDP
Port Range: 5060-5061

Name: Vonage 2
Source: WAN,*
Destination: LAN,<PAP2’s IP Address>
Protocol: UDP
Port Range: 10000-20000

I got that done, did the magic on Vonage’s site to enable that ATA, and got a dial tone on the phone I plugged in. After that a quick test call to my mobile phone confirmed that everything’s working. The final step to completing this is going to be when Verizon transfers my current number over to Vonage.