In addition to opening ports 10000-20000, as per this page,
http://www.vonage.com/help.php?article=89
you also need to open these ports for outgoing connections:

DNS: Port 53 UDP (Domain Name Server - for resolving server IP addresses)
TFTP: Port 69 UDP (for profile upgrades/downgrades)
HTTP: Port 80 UDP (for firmware upgrades/downgrades)
NTP: Port 123 UDP (Network Time Protocol - so the device can sync to the 
proper time for Caller ID)
SIP: Port 5061 UDP is used for older Vonage devices (devices provisioned 
before 2005) Also, BSP Proxy Groups 1-8, and a.voncp.com communicate on 
port 5061.

Adding firewall rules to do all of that worked successfully for a vonage 
connection I had inside a m0n0wall-protected network.

 Steve





Josh Hyles wrote:

>I just moved in with a friend who is using vonage. So we ditched my
>DSL and got a cable modem. I'm using m0n0wall 1.2 and have been for
>quite a while. When i plug in the vonage router to my network, it
>works fine for quite a while. After some time (not sure of the actual
>time frame) the phone line light goes out meaning there is no more
>connection to the vonage server. We now have the vonage router doing
>all the dhcp/routing, and its working fine and has been for about 5
>hours. I've read on here that there is no need to configure anything,
>but I'm at a loss as to what my problem is. I did read on vonages
>website that you need to have ports 10000-20000 forwarded to the
>router? is that correct?
>
>Any other help/experience would be much appreciated.
>
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