Typical procedure for an online session with OUA

The user of a W(LAN)-enabled end device is within reach of an access point or a network outlet in a Public Spot mode.
- WLAN: After system startup, the WLAN adapter automatically logs on to the appropriate access point.
- LAN: After system startup the user connects to the network with a suitable cable and is assigned an address by the DHCP server.
Internet access or the use of chargeable services is not yet possible at this stage.
The user starts a web browser. The device offering the Public Spot service automatically directs the user to the login page of the Public Spot. This page provides detailed information on using the services.Alternatively, the user's client device automatically performs captive portal detection and presents the login page of the Public Spot immediately after associating with the WLAN. Generally, the user purchases a voucher with login data that grants a limited amount of access time. Other login methods are also possible, such as login after confirming the provider's terms of use or independently requesting login data via e-mail or a text message (SMS).
In the case of a login using a voucher, the user enters his login data (username and password) on the login page. Depending on the configuration, the RADIUS server on the device (internal) or an external one checks the login data that was entered. If the login is successful, the user gains access to the Public Spot. Otherwise an error message will be displayed. If a prepaid model is employed, i.e. access is to be granted for a limited period of time only, then the RADIUS server additionally informs the Public Spot about the user's time credit.
The user can log off from the Public Spot at any time. The Public Spot can terminate a session itself if the time credit has expired, if a specified expiry date is reached, or if contact is lost for an extended period.During and at the end of a session the Public Spot provides the user with an overview of the session data. If required, the Public Spot can simultaneously transmit all important accounting information to the RADIUS server. This can be the device's internal server or an external server.