The fact that it works with almost the same setup, just a change in internet service location strongly implies that this is cause by the internet service coming to your home. It could be as simple as a signal strength issue cause by a bad splitter, house wiring, or the drop coming into your home.
Also, do you have the SB5120 in both of your locations? I have heard of many problems with certain versions of this modem having compatibility issues with Vonage I personally have the 5120 in my home and have had no problems with it, but this does go against most of what I have been told by Vonage users and tech support alike.
As for PingPlotter www.pingplotter.com, you really only need the freeware edition don't worry about any of the pay features. Just set it up with the address www.vonage.com and let it run for a few hours. This will give you info on exactly how many packets have been dropped and at which hop the packets have been lost. This tool is invaluable in troubleshooting an intermittent issue such as your own. Once you have the data from here you should be able to call your ISP and give them indisputable info that there is an issue they have to resolved, and you can even tell them exactly where that issue is occurring.
outrun Vonage Forum Senior
Joined: Mar 15, 2005 Posts: 114
Location: Ashland, MA
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