React Native CallKeep

React Native CallKeep is a library designed to integrate native iOS CallKit and Android ConnectionService frameworks into React Native applications, facilitating the development of VoIP calling features. It provides a unified JavaScript API for managing the incoming and outgoing call UI, handling call actions like answer and end, and ensuring compliance with platform-specific requirements for background calling and permissions. The current stable version is 4.3.16. While the project shows frequent historical updates, recent analysis from sources like Snyk suggests an 'Inactive' maintenance status with no new npm releases in the past 12 months, and low attention from maintainers. Key differentiators include its comprehensive handling of Android 11's foreground service requirements for background audio and the flexibility of early iOS setup via `AppDelegate.m` for capturing pre-JS bridge events.