WebRTC

WebRTC (Web Real-Time Communication) is an open-source project and set of browser APIs that enable real-time voice, video, and data communication directly between web browsers and devices — without requiring plugins or native app installs.

While SIP is the dominant signaling protocol for carrier-grade VoIP, WebRTC uses its own JavaScript APIs for session management. Many platforms bridge both worlds — using SIP for backend routing and WebRTC for browser-based endpoints. Codecs like Opus and VP8/VP9 are standard in WebRTC.

Service providers can extend their VoIP offering to the browser using WebRTC gateways, complementing their native softphone apps. This provides a complete multi-device communication solution under one brand.