CallKit + PushKit (iOS)

System call UI for VoIP: native incoming/outgoing screens, lock-screen answer, Recents integration, and caller ID / blocking. Grounded in Apple's CallKit and PushKit frameworks; iOS 26 era.

• Two frameworks, one flow: PushKit wakes the app for an incoming call; CallKit renders the call and owns the audio session.
• Non-VoIP push (chat, marketing, transaction alerts) → push-notifications. PushKit VoIP pushes are only for calls and are policed (see below).
• Caller-ID source data (names/labels for numbers) often comes from contacts-framework or your backend; the Call Directory extension just publishes it.

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