Unfortunately, there is no information related to the IS RCI Dialer. I have tried to access documents, manuals or any troubleshooting guides but none was available. If you can't connect to VPN, then you should check the firewall on your computer to allow the client to connect, then go to Help > About and get in contact with the developer of the application or the carrier you're using the device with. They should provide information related to the functionality and VPN connections.