"CONNECTION REFUSED - CONTACT TW ADMIN" - Is a message meaning the set is unknown (not setup in the MBG or MAC is defined incorrectly) and you do not have an installation password set in the configuration of the MBG for your ICP(s)... x-man is also correct, you do not need a public IP on the phone, just a normal IPv4 LAN IP provided by DHCP, in fact it is probably a bad idea to have a public IP directly on a phone and a waste of resources that are unnecessary.