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04/10/2026, 7:56 PMtall-airline-16756
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04/10/2026, 7:57 PMnumerous-waiter-97064
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04/10/2026, 8:00 PMnumerous-waiter-97064
04/10/2026, 8:01 PMtall-airline-16756
04/10/2026, 8:02 PMroom.disconnect() (check any templates/examples you used),
◦ SIP/carrier timeouts (carriers may drop calls on long silence),
◦ or network/connectivity problems (ICE/STUN/TURN keep‑alive failures, NAT timeouts).
Recommended production actions
1. Audit code and dependencies
◦ Search your codebase and any agent/template libraries for silence timers or calls to room.disconnect() / end-call helpers.
1. Keep DTX enabled
◦ Leave DTX on for bandwidth and scalability — disabling it only increases traffic and won’t stop logical timeouts.
1. Use explicit lifecycle signals
◦ Rely on participant events (participant_left), an explicit end-call API, or an EndCallTool rather than audio activity to determine session end.
1. If long pauses are expected
◦ Increase or remove any silence threshold in the agent logic, or inject low-level comfort noise/heartbeat packets and/or presence heartbeats so “activity” persists.
1. Check network/transport
◦ Verify ICE/STUN/TURN setup and logs. Network keep‑alive failures cause disconnects after ~15–20s; use TURN if clients are behind restrictive NATs.
If you want, I can:
• Scan for common silence-timeout code snippets if you paste relevant parts of your server/agent code, or
• Provide a small code/config example (for your SDK version) to implement presence heartbeats or disable silence-based cleanup.
Which would you like me to show?
Sources: Bringing Zoom's end-to-end optimizations to WebRTC | LiveKit | Understanding the STATE_MISMATCH Disconnect Reason | How to detect and handle silence during calls | examples/drive-thru | livekit/livekit_composite | DeepWiki | examples/voice_agents | livekit/livekit_composite | DeepWiki, with interactive elementsnumerous-waiter-97064
04/10/2026, 8:02 PMtall-airline-16756
04/10/2026, 8:02 PMPeerConnectionDisconnected / StateMismatch)?
• Topology: are you using TURN, a SIP gateway, or any custom agents/templates?
• Scale/network: are users behind NAT/cellular networks or specific carriers?
Immediate steps to run now
1. Enable verbose/debug logs on client and server and reproduce; look for ICE/DTLS/PeerConnection state transitions and any room.disconnect() calls.
2. Monitor connection events on the client:
◦ connectionState / iceConnectionState / signalingState
◦ participant events (joined/left)
1. Verify TURN is configured and working for clients behind restrictive NATs.
2. Confirm there’s no library/agent code calling room.disconnect() or a silence timer in your dependencies.
3. If you suspect carrier/SIP, test a pure LiveKit-to-LiveKit call (no SIP) to separate carrier issues.
What I can do next
• If you paste a short client log snippet (connection/ICE state transitions) or your server/agent cleanup code, I’ll point to the exact cause or the line that triggers disconnects.
• I can share a code snippet to add connection-state monitoring and automatic reconnection/heartbeat for SDK 2.4.7.
Which would you like to do first — share logs or get the monitoring/reconnect snippet?
, with interactive elementsnumerous-waiter-97064
04/10/2026, 8:04 PMtall-airline-16756
04/10/2026, 8:04 PMconnectionState, iceConnectionState, signalingState
◦ participant joined/left events
• Confirm whether video/data also stop or only audio.
Network-focused checks
• Verify TURN is configured and reachable for clients behind NATs. Test a call with TURN forced on.
• Inspect ICE/STUN timing in logs — PeerConnectionDisconnected or StateMismatch indicate network/transport issues.
• If clients are on cellular/wifi, test under same network conditions and with a stable LAN to compare.
Quick mitigations to reduce silent failures
• Add client-side connection monitoring and auto-reconnect:
◦ Listen to iceConnectionState / connectionState and attempt reconnect or re-join when they become "disconnected" or "failed".
• Add a lightweight heartbeat/presence message every 10–15s (data channel or a small audio comfort-noise packet) so long NAT mappings and carriers see activity.
• Keep DTX enabled (it won’t cause disconnects and saves bandwidth).
What I can do next
• If you share a short log snippet showing the state transitions around a disconnect, I’ll pinpoint whether it’s network/ICE, SDK/logic, or an explicit room.disconnect() call.
• Or I can provide a minimal SDK 2.4.7 code snippet for: (A) connection-state monitoring + auto-reconnect or (B) a heartbeat implementation—which do you want?, with interactive elementsnumerous-waiter-97064
04/10/2026, 8:07 PMtall-airline-16756
04/10/2026, 8:07 PMiceConnectionState / connectionState and treat "disconnected" / "failed" as a trigger to attempt rejoin or restart the PeerConnection.
1. Add a lightweight heartbeat if you need to keep NAT/Carrier mappings alive:
◦ Send a small periodic message over a DataChannel (every 10–15s) or inject low-level comfort noise—this is cheaper than disabling DTX.
1. Log timestamps of state changes for diagnosis (capture when ICE goes to "failed"/"disconnected" and when reconnect succeeds).
Minimal code patterns (SDK 2.4.7 — adapt to your language)
• To disable DTX on an outgoing audio track (example pseudocode):
// when creating/publishing audio track
const pub = await room.localParticipant.publishTrack(micTrack, {
opus: { dtx: false } // increases bandwidth
});
• Connection-state monitoring + simple reconnect (pseudocode):
room.on('connectionStateChanged', (state) => {
if (state === 'disconnected' || state === 'failed') {
// attempt reconnect logic: e.g., try to join again or recreate connection
attemptReconnect();
}
});
room.on('participantDisconnected', (p) => {
// log and handle unexpected participant drops
});
• Heartbeat over DataChannel:
const dc = room.localParticipant.createDataChannel('hb');
setInterval(() => {
if (dc.readyState === 'open') dc.send(JSON.stringify({ t: Date.now(), type: 'hb' }));
}, 15000);
When to disable DTX
• Only consider disabling DTX if you have a specific SIP/carrier requirement that treats silence as packet loss and you cannot otherwise send heartbeats. Prefer heartbeats or comfort-noise injection first.
If you want, I can:
• Provide a full runnable snippet for your client platform (web/iOS/Android/Node), or
• Review a short client log (ICE/connection state transitions) to point to the root cause.
Which would you prefer?
, with interactive elementsnumerous-waiter-97064
04/10/2026, 8:09 PMtall-airline-16756
04/10/2026, 8:09 PMnumerous-waiter-97064
04/10/2026, 8:10 PMtall-airline-16756
04/10/2026, 8:10 PMnumerous-waiter-97064
04/10/2026, 8:10 PMDisconnected: ${reason}, "Red");
// Logic to show a manual "Retry" button
});
// --- LAYER 2: THE "GHOST" WATCHDOG (Priority: Safety Net) ---
room.on(RoomEvent.ConnectionQualityChanged, (quality) => {
if (quality === ConnectionQuality.Lost && room.state === ConnectionState.Connected) {
// We are "Connected" but quality is "Lost" = Potential Ghost State.
// We wait 5 seconds before overriding LiveKit's internal timers.
if (!ghostTimer) {
ghostTimer = setTimeout(async () => {
if (room.state === ConnectionState.Connected && navigator.onLine) {
console.warn("Ghost State confirmed. Forcing manual recovery.");
await room.reconnect(); // Safe in v2.7
}
ghostTimer = null;
}, 5000);
}
} else if (quality !== ConnectionQuality.Lost) {
clearTimeout(ghostTimer);
ghostTimer = null;
}
});
// --- LAYER 3: HARDWARE INTERNET CHECK (Priority: Physical) ---
window.addEventListener('offline', () => {
updateUI("No Internet Connection", "Grey");
// We don't call room.reconnect here because it will fail anyway.
});
window.addEventListener('online', () => {
if (room.state !== ConnectionState.Connected) {
updateUI("Internet restored, stabilizing...", "Yellow");
room.reconnect();
}
});
function updateUI(message, color) {
console.log([UI Update] ${message});
// Your UI framework logic here (React/Vue/Plain JS)
}
3. Priority Handling & Flow Logic
To ensure a smooth UX, the app follows this decision tree:
Scenario
Primary Handler
UI Message
Action
User unplugs Ethernet
Browser offline event
"No Internet"
Stop all attempts (Save Battery).
Wi-Fi to 5G Switch
LiveKit Reconnecting
"Unstable... reconnecting"
LiveKit performs a "Resume" (<1s).
Router dies (Ghost)
Your Watchdog
"Quality Lost"
Wait 5s, then force room.reconnect().
Internet returns
Browser online event
"Restored..."
Trigger room.reconnect() immediately.
4. Why this is "High Performance"
• No Conflicts: The ghostTimer only starts if room.state is Connected. If LiveKit's own Reconnecting state kicks in, the timer is cleared immediately. This prevents two "reconnect" commands from hitting the server at once.
• Fast Failover: By setting dtx: false, the ConnectionQuality will drop to Lost within 2-3 seconds of a break. Your app will catch the problem and have the user back in the call before the browser's default timeout even finishes.
• Battery/CPU Efficient: The online/offline check prevents the CPU from spinning in circles trying to find a server when the Wi-Fi card is literally turned off.
Summary for your UX
When the user's connection fails, they will see "Unstable" within 3 seconds. If it stays broken for 5 seconds, the system forces a refresh. The moment their 5G/Wi-Fi signal returns, the browser online event fires, and they are back in the call instantly.tall-airline-16756
04/10/2026, 8:10 PMconnectionState and iceConnectionState for clearer signals (some ghost cases show quality lost while the SDK still thinks it’s connected).
• Don’t set publishDefaults.dtx: false globally. If you still want to test DTX=false, do it as an experiment for a small subset — otherwise use a heartbeat:
◦ DataChannel heartbeat every 10–15s is cheaper and preserves DTX benefits.
• Ensure your watchdog only calls one recovery path:
◦ If LiveKit emits Reconnecting or SignalingState changes, cancel the ghostTimer.
◦ When forcing recovery, prefer room.reconnect() if available in your client build; if not, do a safe rejoin flow (leave + join or recreate PeerConnection).
• Tune timers conservatively:
◦ Detect Lost → start ghostTimer (3–5s) to avoid false positives on short blips.
◦ Use longer backoff for repeated failures to avoid thundering reconnections.
Small additions to your flow
• Log with timestamps for: ConnectionQualityChanged, connectionState, iceConnectionState, room.reconnect attempts, online/offline events. This makes root-cause analysis much faster.
• Add exponential backoff for automatic reconnect attempts and show a manual Retry after N automatic failures.
• If you use TURN, keep it enforced in tests to validate behavior under restrictive networks.
If you want, I can:
• Provide a minimal, ready-to-run SDK 2.4.7 example implementing your three layers with a DataChannel heartbeat and safe reconnect logic.
• Or review a short log snippet if you paste one, and point to which signal triggered the disconnect.
Which do you prefer?
, with interactive elementsnumerous-waiter-97064
04/10/2026, 8:12 PMtall-airline-16756
04/10/2026, 8:13 PMroom.reconnect() is available in your client build, prefer it. Otherwise implement a safe rejoin (leave + join or recreate PeerConnection).
• Logging & observability:
◦ Log timestamps for ConnectionQualityChanged, connectionState, iceConnectionState, online/offline, reconnect attempts — this makes root‑cause analysis fast.
• TURN:
◦ Force TURN in tests to reproduce NAT/carrier cases and ensure fallback works.
Minimal recommended pattern (conceptual)
• Keep DTX = default
• Start DataChannel heartbeat
• On ConnectionQuality Lost + room.state === Connected:
◦ start ghostTimer (3–5s)
◦ if still Lost and navigator.onLine → call reconnect path
• Cancel ghostTimer if SDK reports Reconnecting or iceConnectionState changes
• On offline → pause recovery attempts; on online → attempt reconnect (with backoff)
If you want, I can:
• Provide a ready-to-run SDK 2.7 JavaScript example implementing these layers (with DataChannel heartbeat, robust event handling, and backoff), or
• Review a short log snippet you paste and point to which event indicates the ghost disconnect.
Which would you like next?
Sources: Understanding "silence detected on local audio track" warning | Bringing Zoom's end-to-end optimizations to WebRTC | LiveKit | client-sdk-js | livekit/livekit_composite | DeepWiki | Server options | LiveKit Documentation | Diagnosing Connection Errors with Connection Test Utility, with interactive elementsnumerous-waiter-97064
04/10/2026, 8:14 PMjavascript
const room = new Room({
// Lower the reconnection timeout if you want it to fail faster
reconnectPolicy: {
nextRetryDelay: (context) => {
// Force a faster first retry (e.g., 200ms instead of random jitter)
if (context.retryCount === 0) return 200;
return 1000 * Math.pow(2, context.retryCount);
}
},
// Set a more aggressive connection timeout
connectOptions: {
timeout: 5000, // 5 seconds instead of the default 15
}
});
### Summary of the "Slowdown"
| Version | Approach | Why it feels faster/slower |
| :--- | :--- | :--- |
| 2.4.7 | Aggressive / Immediate | High risk of server-side crashes during mass disconnects. |
| 2.7.x | Safe / Jittered | More reliable. Prevents "ghost" loops but adds a few seconds of "thinking" time. |
Verdict: The extra time is the SDK being more "professional" and avoiding signaling collisions. If you want it faster, use the reconnectPolicy above to bypass the jitter on the first attempt.tall-airline-16756
04/10/2026, 8:14 PMconst room = new Room({
reconnectPolicy: {
nextRetryDelay: (context) => {
if (context.retryCount === 0) return 200; // fast first retry
return 1000 * Math.pow(2, context.retryCount); // backoff after
}
},
connectOptions: {
timeout: 5000, // shorten connect timeout
}
});
Additional recommendations
• Monitor connectionState + iceConnectionState + ConnectionQuality together; cancel your watchdog if SDK reports Reconnecting.
• Use a lightweight DataChannel heartbeat (10–15s) instead of disabling DTX globally.
• Log timestamps for state transitions to measure end‑to‑end recovery time.
• Test under realistic network churn and with TURN enforced.
Would you like:
• A full ready‑to‑run SDK 2.7 example that implements your three‑layer watchdog plus tuned reconnectPolicy and heartbeat, or
• Help tuning specific timing values for your user base/network conditions?
Which do you prefer?
, with interactive elementsnumerous-waiter-97064
04/11/2026, 4:15 AMtall-airline-16756
04/11/2026, 4:15 AMnumerous-waiter-97064
04/11/2026, 5:08 AM