What is the difference between residential and business service? It seems identical on the website.

Also, I already have a VOIPo line in my house but would like to add another line in my home-office. However because of the physical layout, I would need to have another adapter in my office. My current setup has a cable modem with a router behind it to which my current VOIPo adapter is connected. I would add the second VOIPo adapter behind a switch that is connected to the same router. Will this create a problem?