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How to detect voice mail using NodeJS
# ask-ai
b
How to detect voice mail using NodeJS
t
Thanks for reaching out, MOHAN. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.
Hey there! If you want to detect voicemail using Node.js in LiveKit, a great way is to combine the Silero-based Voice Activity Detection (VAD) plugin with some smart LLM-based analysis for even better accuracy. Let me walk you through it step-by-step: 1. Install Required Packages: First up, you'll need to install the Node.js packages for VAD and the LiveKit client: 
npm install @livekit/agents-plugin-silero @livekit/client
2. Set Up VAD and Silence Monitoring: Next, use the Silero VAD plugin to keep an ear on the audio and spot those longer silence periods:
Copy code
import { Room } from 'livekit-client';
import { SileroVAD } from '@livekit/agents-plugin-silero';

const room = new Room({
  url: '<ws://localhost:7880>',
  token: 'your-token',
});

const vad = new SileroVAD();
const SILENCE_THRESHOLD = 5000; // 5 seconds
let userLastSpokeTime = Date.now();

vad.on('speechStart', () => {
  userLastSpokeTime = Date.now();
});

setInterval(() => {
  if (Date.now() - userLastSpokeTime > SILENCE_THRESHOLD) {
    console.log('Silence threshold exceeded, potential voicemail detected');
    handleVoicemailDetection();
  }
}, 1000);
3. Implement LLM-Based Voicemail Detection: To boost accuracy, you can have an LLM analyze the audio once silence is detected:
Copy code
async function handleVoicemailDetection() {
  try {
    const llmResponse = await analyzeAudioWithLLM();
    if (llmResponse.detectedVoicemail) {
      console.log('Voicemail detected by LLM');
      await leaveVoicemailMessage();
    }
  } catch (error) {
    console.error('Error handling voicemail detection:', error);
  }
}
4. Combine VAD and LLM Detection: The magic happens when you bring both VAD and LLM-based detection together for a solid voicemail identification experience. If you want more details or examples, just give me a shout—I’m here to help! Sources: Configuring turn detection and interruptions | LiveKit Docs
b
I need it in server nodeJS
t
Hey there! If you want to detect voicemail using server-side Node.js in LiveKit, a great approach is to combine Voice Activity Detection (VAD) with LLM-based detection. Here’s a friendly walkthrough on how to set this up: 1. Set Up Voice Activity Detection (VAD): LiveKit’s VAD can help you keep an eye on silence during calls. Here’s a quick example:
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const { SileroVAD } = require('@livekit/agents-plugin-silero');

const vad = new SileroVAD({
    threshold: 0.6,
    prefixPaddingMs: 200,
    silenceDurationMs: 500
});

vad.on('silenceDetected', () => {
    console.log('Silence detected, potential voicemail.');
    handleVoicemailDetection();
});
2. Integrate LLM-Based Detection: Once you catch that silence, you can use an LLM to analyze what’s going on and confirm if it’s voicemail:
Copy code
async function handleVoicemailDetection() {
    try {
        await session.generateReply({
            instructions: "This appears to be a voicemail system. Leaving a message."
        });
        await hangupCall();
    } catch (error) {
        console.error('Error handling voicemail detection:', error);
    }
}
3. Combine VAD and LLM: Putting both together gives you a solid way to identify voicemail reliably. Here’s how you might do it:
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const { VoicePipelineAgent } = require('@livekit/node');

class VoicemailDetector {
    constructor(session) {
        this.session = session;
        this.vad = new SileroVAD({
            threshold: 0.6,
            prefixPaddingMs: 200,
            silenceDurationMs: 500
        });
        this.initializeVAD();
    }

    initializeVAD() {
        this.session.on('audio', (audio) => {
            this.vad.processFrame(audio);
            if (this.vad.silenceDetected()) {
                this.handleVoicemailDetection();
            }
        });
    }

    async handleVoicemailDetection() {
        await this.session.generateReply({
            instructions: "Leaving a voicemail message."
        });
        await this.hangupCall();
    }

    async hangupCall() {
        await this.session.session.aclose();
    }
}
If anything’s unclear or you want to dive deeper into any part, just give me a shout—I’m here to help! Sources: plugins/silero/package.json | Voice activity detection (VAD) parameters | LiveKit Docs
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