I am trying to convince my parents to switch to vonage and I have a quick question. I have a router setup for a cable internet and I have a question about having multiple phones. My idea is this... have the adapter near the router and invest in an expandable phone system. Have the answer machine/base phone hooked up to the adapter and then the expandable phones all over the house. Would that work? Or, do you need an adapter for every single phone? http://www.circuitcity.com/ssm/Unid...47666/catOid/-15562/rpem/ccd/productDetail.do that is the set I am looking at... pretty good deal four phones for 70 bucks.