I have this set up currently... http://www.bestbuy.com/site/olspage.jsp?skuId=8640839&st=vonage&lp=5&type=product&cp=1&id=1195597790960 I am cancelling my vonage service and getting regular phone service through ATT. Since the phone base uses a regular phone lone to plug into the vonage box can i just plug that phone line into the wall instead of the vonage box?