For user authentication, you can configure the basic or the OAuth authentication method. If you configure a forced authentication method, the users cannot change the authentication method or modify the Exchange server address. For OAuth authentication, the phone displays a QR code that the users can scan using a mobile device. Alternatively, the users can create an authentication URL and open it on a web browser. After a successful authentication, the user Exchange calendar and contacts synchronize with the phone. Use one of the following sources to configure Exchange integration with the phone: