fix: three root causes for federated DM call failures

1. Accept/reject/end from remote instance now resolves federatedId
   to local dmChannelId via DB lookup, so the host can find its
   VoiceRoom when the event arrives with only a federatedCallId.
   Previously silently failed with "No active call" error.

2. Batch all dm_call_incoming state updates into a single
   useVoiceStore.setState() call. Prevents SoundController from
   starting multiple ringtone instances (async playSound guard
   race when 4 separate set() calls each triggered the subscription).

3. Always overwrite callOrigin/federatedCallId (with null if absent)
   on dm_call_incoming. Prevents stale values from a previous
   federated call routing local accepts to the wrong instance.

packages/server/src/ws/events.ts

@@ -1442,7 +1442,7 @@ function handleDmCallStart(event: Record<string, unknown>, userId: string, usern
 }
 
 function handleDmCallAccept(event: Record<string, unknown>, userId: string, ws: WebSocket): void {
-  const dmChannelId = (event.dmChannelId as string) || null;
+  let dmChannelId = (event.dmChannelId as string) || null;
   const federatedCallId = (event.federatedCallId as string) || null;
 
   if (!dmChannelId && !federatedCallId) {
@@ -1450,6 +1450,18 @@ function handleDmCallAccept(event: Record<string, unknown>, userId: string, ws:
     return;
   }
 
+  // Resolve federatedCallId → dmChannelId when only federatedCallId is provided.
+  // This happens when a remote instance accepts via callOrigin and the DM doesn't
+  // exist there (Path B), but the HOST has the VoiceRoom keyed by dmChannelId.
+  if (!dmChannelId && federatedCallId) {
+    const db = getDb();
+    const ch = db.select({ id: schema.dmChannels.id })
+      .from(schema.dmChannels)
+      .where(eq(schema.dmChannels.federatedId, federatedCallId))
+      .get();
+    if (ch) dmChannelId = ch.id;
+  }
+
   // Path 1: Local room (we're the host) — only possible with dmChannelId
   if (dmChannelId) {
     if (!isDmMember(dmChannelId, userId)) {
@@ -1530,11 +1542,21 @@ function handleDmCallAccept(event: Record<string, unknown>, userId: string, ws:
 }
 
 function handleDmCallReject(event: Record<string, unknown>, userId: string): void {
-  const dmChannelId = (event.dmChannelId as string) || null;
+  let dmChannelId = (event.dmChannelId as string) || null;
   const federatedCallId = (event.federatedCallId as string) || null;
 
   if (!dmChannelId && !federatedCallId) return;
 
+  // Resolve federatedCallId → dmChannelId for host VoiceRoom lookup
+  if (!dmChannelId && federatedCallId) {
+    const db = getDb();
+    const ch = db.select({ id: schema.dmChannels.id })
+      .from(schema.dmChannels)
+      .where(eq(schema.dmChannels.federatedId, federatedCallId))
+      .get();
+    if (ch) dmChannelId = ch.id;
+  }
+
   // Path 1: Local room (we're the host)
   if (dmChannelId) {
     if (!isDmMember(dmChannelId, userId)) return;
@@ -1587,11 +1609,21 @@ function handleDmCallReject(event: Record<string, unknown>, userId: string): voi
 }
 
 function handleDmCallEnd(event: Record<string, unknown>, userId: string): void {
-  const dmChannelId = (event.dmChannelId as string) || null;
+  let dmChannelId = (event.dmChannelId as string) || null;
   const federatedCallId = (event.federatedCallId as string) || null;
 
   if (!dmChannelId && !federatedCallId) return;
 
+  // Resolve federatedCallId → dmChannelId for host VoiceRoom lookup
+  if (!dmChannelId && federatedCallId) {
+    const db = getDb();
+    const ch = db.select({ id: schema.dmChannels.id })
+      .from(schema.dmChannels)
+      .where(eq(schema.dmChannels.federatedId, federatedCallId))
+      .get();
+    if (ch) dmChannelId = ch.id;
+  }
+
   // Path 1: Local room (we're the host)
   if (dmChannelId) {
     if (!isDmMember(dmChannelId, userId)) return;

packages/web/src/hooks/useWebSocket.ts

@@ -779,22 +779,20 @@ function handleEvent(origin: string, event: ServerEvent): void {
     // ─── DM call events (all origins) ──────────────────────────────────────
 
     case 'dm_call_incoming': {
-      const { setIncomingCall, setFederatedCallData, setFederatedCallId, setCallOrigin } = useVoiceStore.getState();
-      setIncomingCall({
+      // Batch ALL call state into a single set() to prevent:
+      // 1. Ringtone multiplication (multiple subscription triggers from separate set() calls)
+      // 2. Stale callOrigin/federatedCallId from previous calls (always overwritten)
+      useVoiceStore.setState({
+        incomingCall: {
           dmChannelId: event.dmChannelId ?? null,
           callerId: event.callerId,
           callerName: event.callerName,
+        },
+        federatedCallToken: event.livekitToken ?? null,
+        federatedCallUrl: event.livekitUrl ?? null,
+        federatedCallId: event.federatedCallId ?? null,
+        callOrigin: event.callOrigin ?? null,
       });
-      // Store federated call data if present (remote LiveKit URL + token)
-      if (event.livekitUrl && event.livekitToken) {
-        setFederatedCallData(event.livekitToken, event.livekitUrl);
-      }
-      if (event.federatedCallId) {
-        setFederatedCallId(event.federatedCallId);
-      }
-      if (event.callOrigin) {
-        setCallOrigin(event.callOrigin);
-      }
       break;
     }