In order to get my NEC IP office phone to work at my home I had to allow these ports in my 3800HGV-B:
"If you find this post helpful and it solved your issue please mark it as a solution. This will help other forum members locate it and will also let everyone know that it corrected your problem. If they have the same issue they will know how to solve theirs"
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.