CallKit The CallKit framework (CallKit.framework) lets VoIP apps integrate with the iPhone UI and give users a great experience. Use this framework to let users view and answer incoming VoIP calls on the lock screen and manage contacts from VoIP calls in the Phone app’s Favorites and Recents views.
Intents The Intents framework (Intents.framework) supports the handling of SiriKit interactions.
IntentsUI The Intents UI framework (IntentsUI.framework) supports the creation of an Intents UI extension, which is an optional app extension that displays custom content in the Siri or Maps interfaces.
Messages To develop an iMessage app, you use the APIs in the Messages framework (Messages.framework) and To create app extensions that interact with the Messages app, allowing users to send text, stickers, media files, and interactive messages.
Speech Using the APIs in the Speech framework (Speech.framework), you can perform speech transcription of both real-time and recorded audio.
UserNotifications User Notifications framework (UserNotifications.framework), which supports the delivery and handling of local and remote notifications.
UserNotificationsUI User Notifications UI framework (UserNotificationsUI.framework) lets you customize the appearance of local and remote notifications when they appear on the user’s device.
VideoSubscriberAccount Video Subscriber Account framework (VideoSubscriberAccount.framework) to help apps that support authenticated streaming or authenticated video on demand (also known as TV Everywhere) authenticate with their cable or satellite TV provider.