Problem Phone calls connect and agent speaks initially, but then goes to static instead of listening and responding to user's voice. What We've Tested & Fixed ✅ Confirmed Working: 1. Twilio webhook → /wisper endpoint responds correctly 2. OpenAI API key → Valid and properly configured on Render 3. TwiML generation → Returns proper <Stream> WebSocket connection 4. Initial TTS → Agent speaks greeting successfully ✅ Bugs We Fixed: 1. reader variable undefined in audio-agent.js speech transcription 2. SIP room monitoring disabled (was creating zombie rooms) 3. Environment variables verified and reloaded ❌ Root Issue Identified: The WebSocket connection to /stream never establishes properly. When Twilio tries to connect to wss://site.com/stream for audio streaming, something fails silently. Current Status - ✅ Call connects - ✅ Greeting plays - ❌ WebSocket /stream connection fails → Static Next Step Needed The WebSocket stream handler is failing to establish connection. This is likely a Render deployment, networking, or WebSocket configuration issue - not an OpenAI/API problem. Question for help: Why would a WebSocket connection to /stream fail silently after TwiML returns a valid <Stream> element?

Thanks for reaching out, Devin. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.

Error Messages/Logs ❌ Problem: We're NOT seeing any WebSocket connection logs on Render server - When user calls, we see NO logs like 🎤 WebSocket connection established - This means the WebSocket connection never even attempts to connect - Should see logs at line 1423: console.log('🎤 WebSocket connection established for LiveKit bridge + Whisper + ChatGPT'); Error Handling ✅ We have error handling: // WebSocket upgrade handler (line 1580) } else if (request.url === '/stream') { console.log('🎤 Twilio Media Stream WebSocket upgrade request'); wss.handleUpgrade(request, socket, head, (ws) => { wss.emit('connection', ws, request); }); } else { console.log('❌ Unknown WebSocket path:', request.url); socket.destroy(); } ❌ But we never see these logs during calls Libraries Used const WebSocket = require('ws'); const wss = new WebSocket.Server({ server, path: '/stream' }); Network Testing ❌ Haven't tested different networks - only tested on Render hosting Key Insight The issue appears to be that Twilio's Media Streams isn't even attempting the WebSocket connection. Possible causes: 1. TwiML <Stream> URL wrong - Should it be ws:// instead of wss://? 2. Render WebSocket support issue - Maybe Render has WebSocket restrictions? 3. Path mismatch - WebSocket server expects /stream but Twilio sending different path? 4. SSL/TLS issue - WSS connection failing due to certificate problems?

Hey there! It looks like Twilio Media Streams might not be trying to connect via WebSocket, and I’d love to help you figure out why. Here are a few common things to check and some tips to troubleshoot: • Network Configuration Issues: Make sure those WebSocket ports (80, 443) and STUN/TURN ports (3478/UDP, 50000-60000/UDP) are open. Sometimes firewalls or network settings can block the connection without us realizing it. • Server Configuration: Double-check that your WebSocket server is set up correctly to accept connections and that the WebSocket URL is spot on. The path needs to match exactly (like

/stream

). • SSL/TLS Issues: If you’re using

wss://

, it’s worth confirming your SSL certificate is valid and configured properly. • Path Mismatch: Take another look at the TwiML

<Stream>

element to ensure it’s pointing to the right WebSocket path (

/stream

). • Network Testing: Try testing the WebSocket connection from a different network or hosting environment to see if something specific to Render might be causing trouble. Since you’re not seeing any WebSocket connection logs, I’d recommend focusing on the TwiML

<Stream>

URL, checking Render’s WebSocket support, and making sure your SSL/TLS setup is solid. If you want, I’m here to walk through any of these steps with you—just let me know! Sources: quickstart/src/userfriendlyerror.js | pkg/service/rtcservice.go | livekit-protocol/src/livekit.rs | Sources/LiveKit/Protos/livekit_models.pb.swift | Deploy to a VM | LiveKit Docs

FINAL ANSWERS TO YOUR QUESTIONS: 1. Error Messages/Logs: - ❌ We see NO WebSocket upgrade logs - meaning Twilio never attempts the WebSocket connection - ✅ Call hangs up after TwiML - suggesting WebSocket connection fails immediately 2. Error Handling: - ✅ Comprehensive error handling added with try-catch blocks and detailed logging - ❌ No errors being caught because connection never reaches our server 3. Libraries/Frameworks: - ✅ Using standard ws library: const WebSocket = require('ws') - ✅ Using noServer: true configuration for HTTP upgrade handling 4. Different Networks/Configurations: - ❌ Not tested on different networks - only Render hosting - ✅ Tested both ws:// and wss:// - both fail the same way - ✅ Enhanced path matching for WebSocket routing 5. Root Cause Identified: The WebSocket connection never reaches our server. This suggests: 1. Render WebSocket limitation - Render may not properly support WebSocket upgrades 2. Network/proxy interference - Something between Twilio and Render blocks WebSocket connections 3. TwiML configuration issue - The <Stream> element may need different parameters

I don't have the answer you're looking for. You could also try asking your question: • in one of the other Slack channels or • to https://deepwiki.com/livekit/livekit_composite which is trained on all LiveKit source code If you find the answer, please post it here to help others!