To implement call notification, you need to integrate the Agora Video SDK, the Agora Signaling SDK, and platform-specific call APIs such as ConnectionService for Android, CallKit for iOS, and CallKeep for Flutter and React Native. The Signaling SDK supports call notification only when the app is running. So, you also need to integrate platform-specific APIs to ensure that users can still receive call notifications when the app is on the background or the process is closed.
Refer to the following articles to learn how to integrate the VSDK and the Signaling SDK:
To implement call invitation for the Signaling SDK, see Call Invitation.