How I can configure agent to greet connected user ?

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

How to prevent user interraptions on greeting message?

You're asking how to prevent users from interrupting the agent's greeting — you can disable interruptions on the greeting call. Options: • Use

session.say()

(recommended for static greetings) ◦ Python:

await session.say("Hello! Welcome to our service.", allow_interruptions=False)

• Node:

await session.say('Hello! Welcome to our service.', { allowInterruptions: false });

• Use

session.generate_reply()

(for LLM-generated/dynamic greetings) ◦ Python:

await session.generate_reply(instructions="Say a warm welcome message", allow_interruptions=False)

• Node:

session.generateReply({ instructions: 'Say a warm welcome message', allowInterruptions: false });

Notes: • Interruptions are allowed by default; setting

allow_interruptions=False

ensures the greeting plays to completion. • You can still force an interrupt later with

session.interrupt()

if needed. Would you like this added into your existing agent lifecycle (e.g.,

on_enter

) or shown in your session-start flow? Sources: Agent speech and audio | LiveKit docs | Turn detection and interruptions | LiveKit Docs

In nodejs I set allowInterruptions to false in two places:

agent: new voice.Agent({
  instructions: agentContext,
  tools: toolsService.getAllTools(),
  allowInterruptions: false,
}),

and

cas.agentSession.generateReply({ allowInterruptions: false });

both doesn't work. and I can interrupt agent

Thanks — I see you're trying to stop users from interrupting the greeting in Node.js and your current changes didn't work. Quick checklist and the fix to make the greeting truly non-interruptible. 1) What to change (required) • Set

allowInterruptions: false

in the AgentSession

voiceOptions

(this is the setting that actually controls interruption detection). • Use

session.say(..., { allowInterruptions: false })

for static greetings (or also pass

allowInterruptions: false

to

generateReply()

), but the session-level

voiceOptions

must be disabled too. Example:

const session = new voice.AgentSession({
  /* stt, llm, tts, vad, etc. */
  voiceOptions: {
    allowInterruptions: false,
    preemptiveGeneration: false, // optional: avoid preemptive behavior
  },
});

await session.start({ agent: new voice.Agent({ instructions: agentContext, tools: toolsService.getAllTools() }), room: ctx.room });

await session.say("Hello! I'm here to help you.", { allowInterruptions: false });

2) Why your current code didn't work •

allowInterruptions

in the

new voice.Agent({...})

constructor is ignored and does not control VAD/interrupt behavior. • Per-call flags (on `generateReply`/`say`) do not reliably prevent interruptions if

voiceOptions.allowInterruptions

on the session is true. 3) Quick debugging steps • Confirm

voiceOptions.allowInterruptions

is set to false when creating AgentSession. • Temporarily remove or disable

vad

to see if VAD is forcing endpointing. • Ensure

preemptiveGeneration

is false during greeting. • Verify package version of livekit agents (use >=0.12.0 if possible). If you want, paste the minimal session creation + greeting code you’re running and your livekit-agents version and I’ll point out exactly what to change. Sources: Agents (Node.js) | livekit/livekit_composite | DeepWiki | Turn detection and interruptions | LiveKit Docs | Agent speech and audio | LiveKit docs | Agent session | LiveKit docs

How to enable interruptions after first agent message?

You want interruptions enabled only after the agent's first message — here's a concise way to do that in Node.js. 1) Send the first greeting with interruptions disabled, wait for playout to finish. 2) For subsequent replies, allow interruptions (default) or explicitly set allowInterruptions: true. Example:

const session = new voice.AgentSession({
  /* stt, llm, tts, vad, etc. */
  voiceOptions: {
    // keep default true so later replies are interruptible
    allowInterruptions: true,
    preemptiveGeneration: false,
  },
});

await session.start({ agent: new voice.Agent({ instructions: agentContext, tools: toolsService.getAllTools() }), room: ctx.room });

// 1) non-interruptible greeting
const handle = await session.say("Hello! How can I help you today?", { allowInterruptions: false });
await handle.waitForPlayout(); // ensure greeting finished

// 2) subsequent replies are interruptible
// either generateReply or say() without disabling interruptions:
await session.generateReply({ instructions: "Respond to the user.", allowInterruptions: true });

Notes: • Ensure session-level

voiceOptions.allowInterruptions

is true (default) so the per-call flags behave as expected. • If you globally set

voiceOptions.allowInterruptions: false

, you must explicitly re-enable for later calls. •

waitForPlayout()

ensures the greeting finishes before allowing interruption. Want me to adapt this to your exact session/agent code? Paste the snippet and I’ll tailor it. Sources: Agents (Node.js) | livekit/livekit_composite | DeepWiki | Turn detection and interruptions | LiveKit Docs

I disabled interruptions by voiceOptions-allowInterruptions = false in agent session options. Only that helped. So now I need to enable interruptions after first greeting

You can re-enable interruptions at runtime by updating the session’s voiceOptions after the greeting finishes. Use

session.updateOptions()

right after the greeting playout completes. Example (Node.js):

// session created with voiceOptions.allowInterruptions = false
await session.start({ agent, room: ctx.room });

// non-interruptible greeting
const handle = await session.say("Hello! How can I help you today?", { allowInterruptions: false });
await handle.waitForPlayout(); // ensure greeting finished

// re-enable interruptions for subsequent speech
session.updateOptions({
  voiceOptions: { allowInterruptions: true },
});

Notes: • The update applies to future speech only; it won’t affect the currently playing utterance. • If you used

generateReply()

for the greeting, await its playout the same way before calling

updateOptions()

. • If you want an immediate switch without waiting for playout, skip

waitForPlayout()

but user speech may cut the greeting. Would you like this added into your existing session code? Paste it and I’ll adapt it. Sources: Agents (Node.js) | livekit/livekit_composite | DeepWiki

there is no updateOptions method on session

Thanks — I’ll correct that and give the accurate options. Because you started the session with

voiceOptions.allowInterruptions = false

, you cannot change that session’s pipeline interruption detection at runtime. The SDK does not support updating

voiceOptions

after start. Your realistic choices are: Option A — Restart the session with interruptions enabled (recommended) 1. Stop/cleanup the current session. 2. Create a new

AgentSession

with

voiceOptions.allowInterruptions = true

. 3. Start the new session and send the greeting as a non-interruptible utterance:

// recreate session with interruptions enabled
const session = new voice.AgentSession({
  /* stt, llm, tts, vad, etc. */
  voiceOptions: { allowInterruptions: true, preemptiveGeneration: false },
});
await session.start({ agent, room: ctx.room });

// send greeting non-interruptible for this call only
const handle = await session.say("Hello! How can I help you today?", { allowInterruptions: false });
await handle.waitForPlayout();

// subsequent speech will be interruptible

Option B — If you cannot restart the session: send the greeting in a way that is non-interruptible regardless of session-level setting (may be limited) • If your SDK version supports per-call enforcement when VAD is active, try

session.say(..., { allowInterruptions: false })

and await playout. This may not be reliable when

voiceOptions.allowInterruptions

is false. • Otherwise, implement an application-level guard: ignore/stash incoming user transcripts/events until greeting is complete (e.g., track a

greetingDone

flag and discard or buffer user input until set). Minimal restart steps (Option A): 1. Call any cleanup/stop method on current session (e.g.,

await session.stop()

or close resources). 2. Construct new

AgentSession

with

voiceOptions.allowInterruptions = true

. 3.

await session.start(...)

, send greeting with

{ allowInterruptions: false }

, await playout, then continue. Which option works best depends on your constraints. Please paste: • your current session creation + greeting code, and • your @livekit/agents SDK version (npm list @livekit/agents) — and I’ll give the exact minimal code change to restart the session or implement the app-level guard. Sources: Agents (Node.js) | livekit/livekit_composite | DeepWiki | Turn detection and interruptions | LiveKit Docs | Agent speech and audio | LiveKit docs

How to disable and enable then microphone for user in room ?

To disable/enable a user's microphone in a LiveKit room, use the client's localParticipant

setMicrophoneEnabled

method. Web / JS / Node (Browser client)

// mute
await room.localParticipant.setMicrophoneEnabled(false);

// unmute
await room.localParticipant.setMicrophoneEnabled(true);

Notes: • Disabling unpublishes/mutes the local audio track so other participants stop receiving audio. • Track mute/unmute will emit track events (e.g., TrackMuted/TrackUnmuted) you can listen to update UI. • The same API pattern exists in LiveKit React Native and Flutter clients (syntax varies slightly). If you want, tell me which SDK (web, react-native, flutter) and whether you need to control another participant's microphone from the server side — I can provide exact sample code. Sources: Camera & microphone | LiveKit docs | LiveKit coming to React Native! | Flutter quickstart | LiveKit docs

Nodejs sdk doesn't have this api

You're right — the Node.js server SDK can't toggle a user's local mic. Two workable options: 1) Mute/unmute server-side (stops audio being forwarded) • Use RoomServiceClient.mutePublishedTrack(room, participantIdentity, trackSid, true/false). • Get track SIDs from roomService.listParticipants(roomName). 2) Disable the client mic (best for truly turning off user's device) • Server sends a data message or websocket command to the client. • Client receives it and calls

room.localParticipant.setMicrophoneEnabled(false)

/

true

. If you tell me whether you control the client code (web, React Native, Flutter) and whether you prefer server-side mute or client-side control, I’ll provide the exact code snippets for your stack. Sources: Managing participants | LiveKit docs | Server-side | livekit/livekit_composite | DeepWiki | Camera & microphone | LiveKit docs

Client is SIP provider

With a SIP client you cannot call client-side APIs like

setMicrophoneEnabled

. Two practical approaches remain — pick based on what control you have over the SIP endpoint: 1) Server-side mute (recommended when you can't control SIP device) • Use the LiveKit server SDK to mute the participant's published audio track. This prevents other room participants from hearing them but does not disable the SIP device's mic. • Steps: ◦ Find the participant's audio track SID (via

roomService.listParticipants(roomName)

). ◦ Call

roomService.mutePublishedTrack(roomName, participantIdentity, trackSid, true)

to mute and

... , false)

to unmute. Example (Node.js):

import { RoomServiceClient } from 'livekit-server-sdk';

const svc = new RoomServiceClient(lkUrl, apiKey, apiSecret);

// list participants to find audio track SID
const participants = await svc.listParticipants('room-name');
const p = participants.find(x => x.identity === 'participant-identity');
const audioTrack = p.tracks.find(t => t.type === 'audio');

await svc.mutePublishedTrack('room-name', p.identity, audioTrack.sid, true); // mute
await svc.mutePublishedTrack('room-name', p.identity, audioTrack.sid, false); // unmute

2) SIP-side mute (recommended if you control SIP provider/config) • Send a SIP signal (e.g., SIP INFO, RE-INVITE with SDP to remove sendrecv, or use provider API) to instruct the SIP endpoint to stop sending audio. This fully disables the microphone on the SIP side. • After greeting, send the SIP unmute command to allow audio again. 3) Hybrid / UX-safe approach when exact mute semantics matter • Use server-side mute to prevent audio reaching other participants while also sending a SIP mute command if you can, ensuring both server and endpoint are muted. • Or send a data/event to any client-side controller you have so it mutes locally. Which fits you? • If you control the SIP stack, I can show a SIP re-INVITE or INFO example to mute/unmute. • If you do not control SIP endpoints, use the RoomServiceClient mutePublishedTrack approach — tell me how you identify participants (identity vs SID) and I’ll tailor the snippet.