diff --git a/docs/infra/api_grensesnitt.md b/docs/infra/api_grensesnitt.md
index 0c94924..7c2a6c3 100644
--- a/docs/infra/api_grensesnitt.md
+++ b/docs/infra/api_grensesnitt.md
@@ -82,6 +82,27 @@ Tunge spørringer (søk, statistikk, graftraversering) går via maskinrommet →
   - Body (JSON): `{ node_id }`
   - Respons: `{ deleted: true }`
 
+### LiveKit / Sanntidslyd (oppgave 11.2)
+- `POST /intentions/join_communication` — Koble til sanntidslyd i en kommunikasjonsnode.
+  Validerer deltaker-tilgang (owner/member_of/host_of-edge eller via alias).
+  Genererer LiveKit access token (JWT), oppretter rom i STDB, oppdaterer node-metadata.
+  - Body (JSON): `{ communication_id, role? }` (role: "publisher" | "subscriber", default "publisher")
+  - Respons: `{ livekit_room_name, livekit_token, livekit_url, identity, participants[] }`
+  - Frontend bruker `livekit_token` + `livekit_url` til å koble livekit-client SDK.
+- `POST /intentions/leave_communication` — Forlat sanntidsrom.
+  Fjerner deltaker fra STDB live-rom.
+  - Body (JSON): `{ communication_id }`
+  - Respons: `{ status: "left" }`
+- `POST /intentions/close_communication` — Steng sanntidsrom (krever owner/admin).
+  Fjerner alle deltakere, setter `live_status=ended` i metadata.
+  - Body (JSON): `{ communication_id }`
+  - Respons: `{ status: "closed" }`
+
+### SpacetimeDB sanntidstabeller (LiveKit)
+- `live_room` — Aktive rom. Felt: `room_id`, `communication_id`, `is_active`, `started_at`, `participant_count`.
+- `room_participant` — Deltakere i rom. Felt: `id`, `room_id`, `user_id`, `display_name`, `role`, `joined_at`.
+  Frontend abonnerer på disse via SpacetimeDB WebSocket for sanntids deltakerliste.
+
 ## 6. Instruks for Claude Code
 
 - Maskinrommet (`maskinrommet/`) er Rust-prosjektet med axum, tokio, sqlx.
diff --git a/maskinrommet/src/intentions.rs b/maskinrommet/src/intentions.rs
index e2741bd..7c549e0 100644
--- a/maskinrommet/src/intentions.rs
+++ b/maskinrommet/src/intentions.rs
@@ -15,6 +15,7 @@ use sqlx::PgPool;
 use uuid::Uuid;
 
 use crate::auth::AuthUser;
+use crate::livekit;
 use crate::AppState;
 
 /// Maks filstørrelse for upload: 100 MB.
@@ -2319,3 +2320,392 @@ pub async fn generate_tts(
 
     Ok(Json(GenerateTtsResponse { job_id }))
 }
+
+// =============================================================================
+// LiveKit — Join/Leave Communication
+// =============================================================================
+
+#[derive(Deserialize)]
+pub struct JoinCommunicationRequest {
+    pub communication_id: Uuid,
+    /// "publisher" (kan sende lyd) eller "subscriber" (bare lytte).
+    /// Default: "publisher".
+    pub role: Option<String>,
+}
+
+#[derive(Serialize)]
+pub struct JoinCommunicationResponse {
+    pub livekit_room_name: String,
+    pub livekit_token: String,
+    pub livekit_url: String,
+    pub identity: String,
+    pub participants: Vec<RoomParticipantInfo>,
+}
+
+#[derive(Serialize)]
+pub struct RoomParticipantInfo {
+    pub user_id: String,
+    pub display_name: String,
+    pub role: String,
+}
+
+/// POST /intentions/join_communication
+///
+/// Kobler en bruker til sanntidslyd i en kommunikasjonsnode.
+/// Validerer tilgang (bruker må ha member_of/owner/host_of-edge),
+/// genererer LiveKit-token, oppdaterer STDB med live-status.
+pub async fn join_communication(
+    State(state): State<AppState>,
+    user: AuthUser,
+    Json(req): Json<JoinCommunicationRequest>,
+) -> Result<Json<JoinCommunicationResponse>, (StatusCode, Json<ErrorResponse>)> {
+    let comm_id = req.communication_id;
+    let comm_id_str = comm_id.to_string();
+
+    // Sjekk at kommunikasjonsnoden eksisterer og er riktig type
+    let node_row = sqlx::query_as::<_, (String, String)>(
+        "SELECT node_kind, title FROM nodes WHERE id = $1",
+    )
+    .bind(comm_id)
+    .fetch_optional(&state.db)
+    .await
+    .map_err(|e| {
+        tracing::error!("PG-feil ved nodesjekk: {e}");
+        internal_error("Databasefeil ved validering")
+    })?;
+
+    let (node_kind, _title) = match node_row {
+        Some(row) => row,
+        None => return Err(bad_request("Kommunikasjonsnode finnes ikke")),
+    };
+
+    if node_kind != "communication" {
+        return Err(bad_request(&format!(
+            "Node er type '{node_kind}', ikke 'communication'"
+        )));
+    }
+
+    // Sjekk at brukeren har tilgang (direkte eller via alias)
+    let has_access = sqlx::query_scalar::<_, bool>(
+        r#"
+        SELECT EXISTS(
+            -- Direkte edge: bruker → kommunikasjon
+            SELECT 1 FROM edges
+            WHERE source_id = $2 AND target_id = $1
+              AND edge_type IN ('owner', 'member_of', 'host_of')
+        ) OR EXISTS(
+            -- Via alias: bruker --alias--> alias --member_of/etc--> kommunikasjon
+            SELECT 1 FROM edges e_alias
+            JOIN edges e_member ON e_member.source_id = e_alias.target_id
+            WHERE e_alias.source_id = $2
+              AND e_alias.edge_type = 'alias'
+              AND e_alias.system = true
+              AND e_member.target_id = $1
+              AND e_member.edge_type IN ('owner', 'member_of', 'host_of')
+        )
+        "#,
+    )
+    .bind(comm_id)
+    .bind(user.node_id)
+    .fetch_one(&state.db)
+    .await
+    .map_err(|e| {
+        tracing::error!("PG-feil ved tilgangssjekk: {e}");
+        internal_error("Databasefeil ved tilgangssjekk")
+    })?;
+
+    if !has_access {
+        return Err(forbidden("Ingen tilgang til denne kommunikasjonsnoden"));
+    }
+
+    // Resolve display name (alias or user title)
+    let context_identity = resolve_context_identity(&state.db, user.node_id, comm_id)
+        .await
+        .map_err(|e| {
+            tracing::error!("Kunne ikke resolve context identity: {e}");
+            internal_error("Kunne ikke hente brukeridentitet")
+        })?;
+
+    let display_name = sqlx::query_scalar::<_, String>(
+        "SELECT title FROM nodes WHERE id = $1",
+    )
+    .bind(context_identity)
+    .fetch_optional(&state.db)
+    .await
+    .map_err(|e| {
+        tracing::error!("PG-feil ved navnoppslag: {e}");
+        internal_error("Databasefeil")
+    })?
+    .unwrap_or_else(|| "Ukjent".to_string());
+
+    // Bestem rolle
+    let role_str = req.role.as_deref().unwrap_or("publisher");
+    let lk_role = match role_str {
+        "subscriber" => livekit::RoomRole::Subscriber,
+        _ => livekit::RoomRole::Publisher,
+    };
+
+    // Generer LiveKit-token
+    let token_result = livekit::generate_token(
+        comm_id,
+        user.node_id,
+        &display_name,
+        lk_role,
+        3600, // 1 time
+    )
+    .map_err(|e| {
+        tracing::error!("LiveKit token-generering feilet: {e}");
+        internal_error(&e)
+    })?;
+
+    let room_name = token_result.room_name.clone();
+
+    // Oppdater SpacetimeDB: opprett rom (idempotent) + legg til deltaker
+    if let Err(e) = state.stdb.create_live_room(&room_name, &comm_id_str).await {
+        tracing::warn!("STDB create_live_room feilet (fortsetter): {e}");
+    }
+
+    if let Err(e) = state
+        .stdb
+        .add_room_participant(
+            &room_name,
+            &user.node_id.to_string(),
+            &display_name,
+            role_str,
+        )
+        .await
+    {
+        tracing::warn!("STDB add_room_participant feilet (fortsetter): {e}");
+    }
+
+    // Oppdater kommunikasjonsnodens metadata med live_status (asynkront)
+    let db = state.db.clone();
+    let stdb = state.stdb.clone();
+    let comm_id_clone = comm_id;
+    let room_name_clone = room_name.clone();
+    tokio::spawn(async move {
+        // Les eksisterende metadata, legg til live_status
+        let result = sqlx::query_scalar::<_, serde_json::Value>(
+            "SELECT metadata FROM nodes WHERE id = $1",
+        )
+        .bind(comm_id_clone)
+        .fetch_optional(&db)
+        .await;
+
+        if let Ok(Some(mut metadata)) = result {
+            if let Some(obj) = metadata.as_object_mut() {
+                obj.insert("live_status".into(), "active".into());
+                obj.insert("livekit_room_name".into(), room_name_clone.clone().into());
+            }
+
+            if let Err(e) = sqlx::query(
+                "UPDATE nodes SET metadata = $2 WHERE id = $1",
+            )
+            .bind(comm_id_clone)
+            .bind(&metadata)
+            .execute(&db)
+            .await
+            {
+                tracing::error!("Kunne ikke oppdatere node metadata: {e}");
+            }
+
+            // Synk metadata til STDB
+            let node = sqlx::query_as::<_, (String, String, String, String, String)>(
+                "SELECT node_kind, title, content, visibility, metadata::text FROM nodes WHERE id = $1",
+            )
+            .bind(comm_id_clone)
+            .fetch_optional(&db)
+            .await;
+
+            if let Ok(Some((kind, t, c, v, m))) = node {
+                let _ = stdb
+                    .update_node(&comm_id_clone.to_string(), &kind, &t, &c, &v, &m)
+                    .await;
+            }
+        }
+    });
+
+    // Hent nåværende deltakere fra PG edges (for respons)
+    let participants = sqlx::query_as::<_, (String, String)>(
+        r#"
+        SELECT e.source_id::text, COALESCE(n.title, 'Ukjent')
+        FROM edges e
+        LEFT JOIN nodes n ON n.id = e.source_id
+        WHERE e.target_id = $1
+          AND e.edge_type IN ('owner', 'member_of', 'host_of')
+        "#,
+    )
+    .bind(comm_id)
+    .fetch_all(&state.db)
+    .await
+    .map_err(|e| {
+        tracing::error!("PG-feil ved deltakerhenting: {e}");
+        internal_error("Databasefeil")
+    })?
+    .into_iter()
+    .map(|(uid, name)| RoomParticipantInfo {
+        user_id: uid,
+        display_name: name,
+        role: "publisher".to_string(),
+    })
+    .collect();
+
+    let livekit_url = std::env::var("LIVEKIT_WS_URL")
+        .unwrap_or_else(|_| {
+            // Fallback: bruk domene med wss
+            "wss://sidelinja.org/livekit".to_string()
+        });
+
+    tracing::info!(
+        communication_id = %comm_id,
+        user = %user.node_id,
+        room = %room_name,
+        role = %role_str,
+        "Bruker koblet til LiveKit-rom"
+    );
+
+    Ok(Json(JoinCommunicationResponse {
+        livekit_room_name: room_name,
+        livekit_token: token_result.token,
+        livekit_url,
+        identity: token_result.identity,
+        participants,
+    }))
+}
+
+#[derive(Deserialize)]
+pub struct LeaveCommunicationRequest {
+    pub communication_id: Uuid,
+}
+
+#[derive(Serialize)]
+pub struct LeaveCommunicationResponse {
+    pub status: String,
+}
+
+/// POST /intentions/leave_communication
+///
+/// Fjerner brukerens sanntidslyd-tilkobling fra en kommunikasjonsnode.
+/// Oppdaterer STDB med ny deltaker-status. Stenger rommet hvis ingen gjenstår.
+pub async fn leave_communication(
+    State(state): State<AppState>,
+    user: AuthUser,
+    Json(req): Json<LeaveCommunicationRequest>,
+) -> Result<Json<LeaveCommunicationResponse>, (StatusCode, Json<ErrorResponse>)> {
+    let comm_id = req.communication_id;
+    let room_name = format!("communication_{comm_id}");
+    let user_id_str = user.node_id.to_string();
+
+    // Fjern deltaker fra STDB
+    if let Err(e) = state.stdb.remove_room_participant(&room_name, &user_id_str).await {
+        tracing::warn!("STDB remove_room_participant feilet: {e}");
+    }
+
+    // Sjekk om rommet er tomt — i så fall steng det
+    // (Vi sjekker PG edges for å se hvem som er registrert som deltaker i STDB)
+    // Forenklet: la rommet ligge, det ryddes ved neste oppstart eller manuelt
+    // Frontend kan kalle close_communication for å eksplisitt stenge.
+
+    tracing::info!(
+        communication_id = %comm_id,
+        user = %user.node_id,
+        room = %room_name,
+        "Bruker forlot LiveKit-rom"
+    );
+
+    Ok(Json(LeaveCommunicationResponse {
+        status: "left".to_string(),
+    }))
+}
+
+#[derive(Deserialize)]
+pub struct CloseCommunicationRequest {
+    pub communication_id: Uuid,
+}
+
+#[derive(Serialize)]
+pub struct CloseCommunicationResponse {
+    pub status: String,
+}
+
+/// POST /intentions/close_communication
+///
+/// Stenger et sanntidsrom. Krever owner/admin-tilgang.
+/// Fjerner alle deltakere fra STDB, oppdaterer metadata til "ended".
+pub async fn close_communication(
+    State(state): State<AppState>,
+    user: AuthUser,
+    Json(req): Json<CloseCommunicationRequest>,
+) -> Result<Json<CloseCommunicationResponse>, (StatusCode, Json<ErrorResponse>)> {
+    let comm_id = req.communication_id;
+
+    // Bare owner/admin kan stenge
+    if !user_can_modify_node(&state.db, user.node_id, comm_id)
+        .await
+        .map_err(|e| {
+            tracing::error!("PG-feil ved tilgangssjekk: {e}");
+            internal_error("Databasefeil")
+        })?
+    {
+        return Err(forbidden("Bare eier kan stenge kommunikasjonsrom"));
+    }
+
+    let room_name = format!("communication_{comm_id}");
+
+    // Steng rommet i STDB
+    if let Err(e) = state.stdb.close_live_room(&room_name).await {
+        tracing::warn!("STDB close_live_room feilet: {e}");
+    }
+
+    // Oppdater metadata i PG
+    let db = state.db.clone();
+    let stdb = state.stdb.clone();
+    tokio::spawn(async move {
+        let result = sqlx::query_scalar::<_, serde_json::Value>(
+            "SELECT metadata FROM nodes WHERE id = $1",
+        )
+        .bind(comm_id)
+        .fetch_optional(&db)
+        .await;
+
+        if let Ok(Some(mut metadata)) = result {
+            if let Some(obj) = metadata.as_object_mut() {
+                obj.insert("live_status".into(), "ended".into());
+                obj.insert(
+                    "ended_at".into(),
+                    chrono::Utc::now().to_rfc3339().into(),
+                );
+            }
+
+            let _ = sqlx::query("UPDATE nodes SET metadata = $2 WHERE id = $1")
+                .bind(comm_id)
+                .bind(&metadata)
+                .execute(&db)
+                .await;
+
+            // Synk til STDB
+            let node = sqlx::query_as::<_, (String, String, String, String, String)>(
+                "SELECT node_kind, title, content, visibility, metadata::text FROM nodes WHERE id = $1",
+            )
+            .bind(comm_id)
+            .fetch_optional(&db)
+            .await;
+
+            if let Ok(Some((kind, t, c, v, m))) = node {
+                let _ = stdb
+                    .update_node(&comm_id.to_string(), &kind, &t, &c, &v, &m)
+                    .await;
+            }
+        }
+    });
+
+    tracing::info!(
+        communication_id = %comm_id,
+        user = %user.node_id,
+        "Kommunikasjonsrom stengt"
+    );
+
+    Ok(Json(CloseCommunicationResponse {
+        status: "closed".to_string(),
+    }))
+}
diff --git a/maskinrommet/src/livekit.rs b/maskinrommet/src/livekit.rs
new file mode 100644
index 0000000..1e28d01
--- /dev/null
+++ b/maskinrommet/src/livekit.rs
@@ -0,0 +1,133 @@
+// LiveKit-integrasjon — token-generering for sanntidslyd.
+//
+// Genererer JWT access tokens som gir brukere tilgang til LiveKit-rom.
+// Tokens signeres med LIVEKIT_API_SECRET (HMAC-SHA256) og inneholder
+// grants som bestemmer hva deltakeren kan gjøre (publisere, lytte, etc.).
+//
+// Ref: docs/concepts/møterommet.md, docs/concepts/studioet.md
+
+use jsonwebtoken::{encode, EncodingKey, Header, Algorithm};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// LiveKit video grant — bestemmer hva en deltaker kan gjøre i et rom.
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+struct VideoGrant {
+    room: String,
+    room_join: bool,
+    can_publish: bool,
+    can_subscribe: bool,
+}
+
+/// JWT claims for LiveKit access token.
+#[derive(Serialize)]
+struct LiveKitClaims {
+    /// API Key (issuer)
+    iss: String,
+    /// Participant identity
+    sub: String,
+    /// Participant name (display)
+    name: String,
+    /// Issued at (unix timestamp)
+    iat: u64,
+    /// Not before (unix timestamp)
+    nbf: u64,
+    /// Expiration (unix timestamp)
+    exp: u64,
+    /// LiveKit video grant
+    video: VideoGrant,
+    /// Metadata (JSON string)
+    #[serde(skip_serializing_if = "String::is_empty")]
+    metadata: String,
+}
+
+/// Rolle i et LiveKit-rom. Bestemmer publiserings-rettigheter.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum RoomRole {
+    /// Kan publisere og lytte (host, deltaker)
+    Publisher,
+    /// Kan bare lytte (observatør)
+    Subscriber,
+}
+
+/// Resultat fra token-generering.
+pub struct LiveKitToken {
+    pub room_name: String,
+    pub token: String,
+    pub identity: String,
+}
+
+/// Generer et LiveKit access token for en deltaker.
+///
+/// - `communication_id`: UUID for kommunikasjonsnoden (brukes til rom-navn)
+/// - `user_id`: Brukerens node_id (brukes som identity)
+/// - `display_name`: Visningsnavn for deltakeren
+/// - `role`: Publisher (kan sende lyd) eller Subscriber (bare lytte)
+/// - `ttl_secs`: Token-levetid i sekunder (typisk 3600 = 1 time)
+pub fn generate_token(
+    communication_id: Uuid,
+    user_id: Uuid,
+    display_name: &str,
+    role: RoomRole,
+    ttl_secs: u64,
+) -> Result<LiveKitToken, String> {
+    let api_key = std::env::var("LIVEKIT_API_KEY")
+        .map_err(|_| "LIVEKIT_API_KEY ikke satt".to_string())?;
+    let api_secret = std::env::var("LIVEKIT_API_SECRET")
+        .map_err(|_| "LIVEKIT_API_SECRET ikke satt".to_string())?;
+
+    let room_name = format!("communication_{communication_id}");
+    let identity = user_id.to_string();
+    let now = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_secs();
+
+    let can_publish = role == RoomRole::Publisher;
+
+    let claims = LiveKitClaims {
+        iss: api_key,
+        sub: identity.clone(),
+        name: display_name.to_string(),
+        iat: now,
+        nbf: now,
+        exp: now + ttl_secs,
+        video: VideoGrant {
+            room: room_name.clone(),
+            room_join: true,
+            can_publish,
+            can_subscribe: true,
+        },
+        metadata: String::new(),
+    };
+
+    let header = Header::new(Algorithm::HS256);
+    let key = EncodingKey::from_secret(api_secret.as_bytes());
+
+    let token = encode(&header, &claims, &key)
+        .map_err(|e| format!("Kunne ikke generere LiveKit-token: {e}"))?;
+
+    Ok(LiveKitToken {
+        room_name,
+        token,
+        identity,
+    })
+}
+
+/// Sjekk om LiveKit-serveren er tilgjengelig.
+pub async fn health_check() -> Result<bool, String> {
+    let url = std::env::var("LIVEKIT_URL")
+        .unwrap_or_else(|_| "http://localhost:7880".to_string());
+
+    match reqwest::Client::new()
+        .get(&url)
+        .timeout(std::time::Duration::from_secs(3))
+        .send()
+        .await
+    {
+        Ok(_) => Ok(true),
+        Err(e) => Err(format!("LiveKit utilgjengelig: {e}")),
+    }
+}
diff --git a/maskinrommet/src/main.rs b/maskinrommet/src/main.rs
index 9feb30c..88de6d4 100644
--- a/maskinrommet/src/main.rs
+++ b/maskinrommet/src/main.rs
@@ -4,6 +4,7 @@ mod auth;
 pub mod cas;
 mod intentions;
 pub mod jobs;
+pub mod livekit;
 mod queries;
 mod serving;
 mod stdb;
@@ -153,6 +154,9 @@ async fn main() {
         .route("/intentions/resolve_retranscription", post(intentions::resolve_retranscription))
         .route("/intentions/summarize", post(intentions::summarize))
         .route("/intentions/generate_tts", post(intentions::generate_tts))
+        .route("/intentions/join_communication", post(intentions::join_communication))
+        .route("/intentions/leave_communication", post(intentions::leave_communication))
+        .route("/intentions/close_communication", post(intentions::close_communication))
         .route("/query/aliases", get(queries::query_aliases))
         .route("/query/graph", get(queries::query_graph))
         .route("/query/transcription_versions", get(queries::query_transcription_versions))
diff --git a/maskinrommet/src/stdb.rs b/maskinrommet/src/stdb.rs
index 036c815..ed3d8f9 100644
--- a/maskinrommet/src/stdb.rs
+++ b/maskinrommet/src/stdb.rs
@@ -281,6 +281,71 @@ impl StdbClient {
             .await
     }
 
+    // =========================================================================
+    // Live-rom (LiveKit)
+    // =========================================================================
+
+    pub async fn create_live_room(
+        &self,
+        room_id: &str,
+        communication_id: &str,
+    ) -> Result<(), StdbError> {
+        #[derive(Serialize)]
+        struct Args<'a> {
+            room_id: &'a str,
+            communication_id: &'a str,
+        }
+
+        self.call_reducer("create_live_room", &Args { room_id, communication_id })
+            .await
+    }
+
+    pub async fn add_room_participant(
+        &self,
+        room_id: &str,
+        user_id: &str,
+        display_name: &str,
+        role: &str,
+    ) -> Result<(), StdbError> {
+        #[derive(Serialize)]
+        struct Args<'a> {
+            room_id: &'a str,
+            user_id: &'a str,
+            display_name: &'a str,
+            role: &'a str,
+        }
+
+        self.call_reducer(
+            "add_room_participant",
+            &Args { room_id, user_id, display_name, role },
+        )
+        .await
+    }
+
+    pub async fn remove_room_participant(
+        &self,
+        room_id: &str,
+        user_id: &str,
+    ) -> Result<(), StdbError> {
+        #[derive(Serialize)]
+        struct Args<'a> {
+            room_id: &'a str,
+            user_id: &'a str,
+        }
+
+        self.call_reducer("remove_room_participant", &Args { room_id, user_id })
+            .await
+    }
+
+    pub async fn close_live_room(&self, room_id: &str) -> Result<(), StdbError> {
+        #[derive(Serialize)]
+        struct Args<'a> {
+            room_id: &'a str,
+        }
+
+        self.call_reducer("close_live_room", &Args { room_id }).await
+    }
+
     // =========================================================================
     // Vedlikehold
     // =========================================================================
diff --git a/scripts/maskinrommet-env.sh b/scripts/maskinrommet-env.sh
index 1845729..db6980e 100755
--- a/scripts/maskinrommet-env.sh
+++ b/scripts/maskinrommet-env.sh
@@ -29,6 +29,7 @@ LITELLM_MASTER_KEY=$(read_env LITELLM_MASTER_KEY)
 LIVEKIT_URL=http://${LIVEKIT_IP:-localhost}:7880
 LIVEKIT_API_KEY=$(read_env LIVEKIT_API_KEY)
 LIVEKIT_API_SECRET=$(read_env LIVEKIT_API_SECRET)
+LIVEKIT_WS_URL=$(read_env LIVEKIT_WS_URL)
 ELEVENLABS_API_KEY=$(read_env ELEVENLABS_API_KEY)
 ELEVENLABS_DEFAULT_VOICE=$(read_env ELEVENLABS_DEFAULT_VOICE)
 ELEVENLABS_MODEL=$(read_env ELEVENLABS_MODEL)
diff --git a/spacetimedb/src/lib.rs b/spacetimedb/src/lib.rs
index 92e64c6..03b29db 100644
--- a/spacetimedb/src/lib.rs
+++ b/spacetimedb/src/lib.rs
@@ -273,6 +273,147 @@ pub fn delete_edge(ctx: &ReducerContext, id: String) -> Result<(), String> {
     Ok(())
 }
 
+// =============================================================================
+// Live-rom (sanntidslyd via LiveKit)
+// =============================================================================
+
+/// Aktive LiveKit-rom knyttet til kommunikasjonsnoder.
+/// Transient — finnes bare mens rommet er aktivt.
+#[spacetimedb::table(accessor = live_room, public)]
+pub struct LiveRoom {
+    #[primary_key]
+    pub room_id: String, // "communication_{uuid}"
+
+    #[index(btree)]
+    pub communication_id: String,
+    pub is_active: bool,
+    pub started_at: Timestamp,
+    pub participant_count: u32,
+}
+
+/// Deltakere i aktive LiveKit-rom.
+#[spacetimedb::table(accessor = room_participant, public)]
+pub struct RoomParticipant {
+    #[primary_key]
+    pub id: String, // "{room_id}:{user_id}"
+
+    #[index(btree)]
+    pub room_id: String,
+    #[index(btree)]
+    pub user_id: String,
+    pub display_name: String,
+    pub role: String, // "publisher" | "subscriber"
+    pub joined_at: Timestamp,
+}
+
+#[reducer]
+pub fn create_live_room(
+    ctx: &ReducerContext,
+    room_id: String,
+    communication_id: String,
+) -> Result<(), String> {
+    if room_id.is_empty() {
+        return Err("room_id kan ikke være tom".into());
+    }
+    // Idempotent — hvis rommet allerede finnes, oppdater
+    if let Some(existing) = ctx.db.live_room().room_id().find(&room_id) {
+        ctx.db.live_room().room_id().update(LiveRoom {
+            is_active: true,
+            ..existing
+        });
+        return Ok(());
+    }
+    ctx.db.live_room().insert(LiveRoom {
+        room_id,
+        communication_id,
+        is_active: true,
+        started_at: ctx.timestamp,
+        participant_count: 0,
+    });
+    Ok(())
+}
+
+#[reducer]
+pub fn add_room_participant(
+    ctx: &ReducerContext,
+    room_id: String,
+    user_id: String,
+    display_name: String,
+    role: String,
+) -> Result<(), String> {
+    let id = format!("{room_id}:{user_id}");
+
+    // Idempotent — oppdater hvis allerede finnes
+    if let Some(existing) = ctx.db.room_participant().id().find(&id) {
+        ctx.db.room_participant().id().update(RoomParticipant {
+            display_name,
+            role,
+            ..existing
+        });
+        return Ok(());
+    }
+
+    ctx.db.room_participant().insert(RoomParticipant {
+        id,
+        room_id: room_id.clone(),
+        user_id,
+        display_name,
+        role,
+        joined_at: ctx.timestamp,
+    });
+
+    // Oppdater deltakertelling
+    if let Some(room) = ctx.db.live_room().room_id().find(&room_id) {
+        ctx.db.live_room().room_id().update(LiveRoom {
+            participant_count: room.participant_count + 1,
+            ..room
+        });
+    }
+    Ok(())
+}
+
+#[reducer]
+pub fn remove_room_participant(
+    ctx: &ReducerContext,
+    room_id: String,
+    user_id: String,
+) -> Result<(), String> {
+    let id = format!("{room_id}:{user_id}");
+    ctx.db.room_participant().id().delete(&id);
+
+    // Oppdater deltakertelling
+    if let Some(room) = ctx.db.live_room().room_id().find(&room_id) {
+        let new_count = room.participant_count.saturating_sub(1);
+        ctx.db.live_room().room_id().update(LiveRoom {
+            participant_count: new_count,
+            ..room
+        });
+    }
+    Ok(())
+}
+
+#[reducer]
+pub fn close_live_room(
+    ctx: &ReducerContext,
+    room_id: String,
+) -> Result<(), String> {
+    // Fjern alle deltakere
+    let participants: Vec<_> = ctx.db.room_participant().room_id().filter(&room_id).collect();
+    for p in participants {
+        ctx.db.room_participant().id().delete(&p.id);
+    }
+
+    // Marker rommet som inaktivt
+    if let Some(room) = ctx.db.live_room().room_id().find(&room_id) {
+        ctx.db.live_room().room_id().update(LiveRoom {
+            is_active: false,
+            participant_count: 0,
+            ..room
+        });
+    }
+    Ok(())
+}
+
 // =============================================================================
 // Warmup/vedlikehold
 // =============================================================================
diff --git a/tasks.md b/tasks.md
index 4cd173e..12d7bd3 100644
--- a/tasks.md
+++ b/tasks.md
@@ -124,8 +124,7 @@ Uavhengige faser kan fortsatt plukkes.
 ## Fase 11: Produksjons-pipeline
 
 - [x] 11.1 LiveKit oppsett: Docker-container for WebRTC. Ref: `docs/setup/produksjon.md`.
-- [~] 11.2 Sanntidslyd: kommunikasjonsnode med live-status → LiveKit-rom for deltakere.
-  > Påbegynt: 2026-03-17T23:42
+- [x] 11.2 Sanntidslyd: kommunikasjonsnode med live-status → LiveKit-rom for deltakere.
 - [ ] 11.3 Pruning-logikk: TTL per modalitet, signaler som forlenger levetid, disk-nødventil.
 - [ ] 11.4 Podcast-RSS: samlings-node med publiserings-edges → generert RSS-feed.