'VoIP call notification using firebase cloud messaging in React Native in iOS when app is in background or kill state

We are implementing VoIP pushes in our app (iOS) using FCM for displaying incoming call in iOS.

We have done following steps:

added VoIP certificate in developer console.
added the APN certificate in firebase console.
use contentAvailable: true & set priority: "high" for cloud messages.
Setting apns-priority as 10 OR apns-push-type as voip results in error: invalid arguments.

Sources

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