Has anybody tried using a VPN and around 10 phones behind the tunnel to connect to an asterisk server using Linksys VPN routers? Like this one: http://www.linksys.com/servlet/Satellite?c=L_Product_C2&childpagename=US%2FLayout&cid=1115416832495&pagename=Linksys%2FCommon%2FVisitorWrapper