Is it necessary to have an HTTP or FTP server for the VPN files? I've tried loading the files onto the phones by putting them onto the embedded memory card on the IPO 500, setting the HTTP and FTP server IP address as the IPO's IP address, and following the steps by entering a sequence of keys on the dial-pad for the phone to look for the files. Am I missing something? or is it simply that I need to have an actual HTTP or FTP server?