GSM SMS Message Receive to FTP

I have a need to setup a windows service software, that will monitor a USB GSM modem. When that modem receives a SMS, that has a Site ID, Username, and password. It will check that the user and password is correct from a configurable form in the app. If that is OK, it then looks up the site ID (this will be a number) in another configurable form, that finds the FTP IP address and Password. It then sends an FTP file to that IP address. The file will be the same for ALL sites. The FTP username will be the same, and the remote path will be the same too. Only the IP address and password change per site. The USB GSM Modem will be this one <[login to view URL]>