Show iOS native call UI for outgoing VoIP calls with CallKit

When my VoIP app receives a call with CallKit, iOS shows the native system call UI.

How can I show this native call view also for outgoing calls?

What is iOS CallKit?

Apple's CallKit is a framework introduced with iOS 10. It gives users the ability to handle VoIP calls from third party apps, such as Skype, similar to how they would handle a system phone call.

What is Callkeep?

This feature is available only on Android. Configures the Foreground Service used for Android 11 to get microphone access on background.

What is CallKit functionality?

Tag: CallKit The Amazon Chime SDKs for iOS and Android allow application developers to integrate real time audio, video and screen share functionality into their iOS and Android applications.

There is not currently a way to immediately show the system's native in-call UI upon dialing an outgoing call from a CallKit VoIP app. However, this native UI is shown if the user locks their device while the VoIP call is ongoing.