CallKit

Wojciech Kwiatek explains the main components of a React Native VoIP app: permissions and media capture, establishing connections with WebRTC, and handling incoming calls while the app is in the background. He walks through WebRTC’s offer and answer exchange, ICE candidates, and signaling, then describes how SIP libraries can simplify call setup and negotiation. He also covers platform-specific notification and call screen behavior, including CallKit on iOS and ConnectionService on Android, and the React Native CallKeep library that bridges them. He concludes by suggesting developers consider existing VoIP SDKs such as Twilio before building everything from scratch.

The conference talks show how React Native teams handle large codebases, code splitting, debugging, animation, security, testing, and real-time communication. Microsoft engineers present React Native Test App and rnx-kit check as tools for simplifying development across monorepos and aligning dependencies. Other speakers demonstrate Re.Pack for webpack-based code splitting, compare debugging and animation tools, and cover security testing, test-driven development, Bluetooth integration tests, WebRTC, and VoIP apps. Across the talks, the speakers explain practical tradeoffs and tools teams can use to build and maintain React Native applications.