CallKit

1. Essentials

   Covers CXProvider, CXProviderDelegate, CXProviderConfiguration, Making and receiving VoIP calls.

2. Incoming calls

   Covers Responding to VoIP Notifications from PushKit, CXCallUpdate, CXAnswerCallAction.

3. Outgoing calls

   Covers Sending End-to-End Encrypted VoIP Calls, CXCallController, CXTransaction, CXStartCallAction.

4. Call-related actions

   Covers CXAction, CXCallAction, CXEndCallAction, CXPlayDTMFCallAction.

5. Call information

   Covers CXCall, CXCallObserver, CXCallObserverDelegate, CXHandle.

6. Caller ID

   Covers Identifying and blocking calls, CXCallDirectoryProvider, CXCallDirectoryExtensionContext, CXCallDirectoryExtensionContextDelegate.

7. Reference

   Covers CallKit Enumerations, CallKit Constants.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

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