How to Create Guest WiFi Codes for Visitors Go to https://cp.cnvoip.net/portal/sponsor/ISS-School/ 2. Enter your full email address and password  3.  Click Create Voucher 4.  Fill out the necessary information  5. If you filled out their email address, or phone number then they should receive the voucher via email, or text.  If not, you can provide them with the voucher here.