Definition

Apps use CallKit to integrate their communication experience with the native iOS telephony system so VoIP calls behave like real phone calls on the device.

Core Concept

Without CallKit, communication apps behave like normal apps:

• custom incoming call screens
• inconsistent audio behavior
• poor lock screen integration
• unreliable background experience

CallKit allows VoIP apps to become part of the native calling ecosystem.

Main Reasons Apps Use CallKit

Native Incoming Call UI

Apps can display the same incoming call screen used by the Phone app.

Example:

provider.reportNewIncomingCall(with: uuid, update: update)

This automatically triggers:

• lock screen UI
• call banner
• system call controls