This article walks through implementing a complete broadcast calling system that enables users to initiate group calls and establish peer-to-peer audio/video connections using WebRTC and WebSockets in Next JS.

Here is the overall System Architecture implementation:

• WebSockets handle real-time signaling - coordinating call setup, participant management, and WebRTC negotiation messages between clients and server through persistent bidirectional connections.
• WebRTC manages peer-to-peer media streaming - audio/video transmission, codec negotiation, and network traversal through NAT/firewalls using ICE candidates for direct client-to-client communication.
• React Context provides centralised state management - ensuring consistent call state across components while avoiding prop drilling and maintaining a single source of truth for connection status and media streams.
• RESTful APIs handle business logic - managing call groups, authentication, call history, and backend integration for logging and analytics.

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