Sub-500ms Voice Agents: WebRTC Streaming with LiveKit and VAD

Build ultra-responsive conversational voice agents capable of natural interruptions and real-time tool calling.

Prerequisites

Node.js or Python
WebRTC basics

Step 1: Step 1: Voice Activity Detection (VAD) Pipeline

Deploy Silero VAD to detect user speech start and stop events with under 20ms latency to enable realistic conversational interruptions.

Step 2: Step 2: WebRTC Audio Streaming Architecture

Stream microphone PCM audio over low-latency UDP WebRTC channels rather than bulky HTTP POST requests.