diff --git a/packages/server/src/ws/events.ts b/packages/server/src/ws/events.ts
index edcafe04..4dc5415c 100644
--- a/packages/server/src/ws/events.ts
+++ b/packages/server/src/ws/events.ts
@@ -1512,8 +1512,14 @@ async function handleDmCallAccept(event: Record<string, unknown>, userId: string
         userId,
         action: 'join',
       });
-      sendFederatedCallAccept(dmChannelId, userId)
-        .catch(err => console.error('[federation] sendFederatedCallAccept error:', err));
+      const acceptFanoutFailures = await sendFederatedCallAccept(dmChannelId, userId);
+      emitFanoutUndeliverable(
+        userId,
+        dmChannelId,
+        fedIdRow?.federatedId ?? null,
+        'accept',
+        acceptFanoutFailures,
+      );
       return;
     }
   }
@@ -1598,8 +1604,16 @@ async function handleDmCallReject(event: Record<string, unknown>, userId: string
       connectionManager.clearVoiceWs(meta.callerId);
       connectionManager.destroyRoom(dmChannelId);
       connectionManager.sendToDmMembers(dmChannelId, { type: 'dm_call_rejected', dmChannelId });
-      sendFederatedCallEnd(dmChannelId, userId)
-        .catch(err => console.error('[federation] sendFederatedCallEnd error:', err));
+      const fedIdRejectRow = getDb().select({ federatedId: schema.dmChannels.federatedId })
+        .from(schema.dmChannels).where(eq(schema.dmChannels.id, dmChannelId)).get();
+      const rejectFanoutFailures = await sendFederatedCallEnd(dmChannelId, userId);
+      emitFanoutUndeliverable(
+        userId,
+        dmChannelId,
+        fedIdRejectRow?.federatedId ?? null,
+        'reject',
+        rejectFanoutFailures,
+      );
       return;
     }
   }
@@ -1684,10 +1698,18 @@ async function handleDmCallEnd(event: Record<string, unknown>, userId: string):
         connectionManager.clearVoiceUserStatus(participantId);
         connectionManager.clearVoiceWs(participantId);
       }
+      const fedIdEndRow = getDb().select({ federatedId: schema.dmChannels.federatedId })
+        .from(schema.dmChannels).where(eq(schema.dmChannels.id, dmChannelId)).get();
       connectionManager.destroyRoom(dmChannelId);
       connectionManager.sendToDmMembers(dmChannelId, { type: 'dm_call_ended', dmChannelId });
-      sendFederatedCallEnd(dmChannelId, userId)
-        .catch(err => console.error('[federation] sendFederatedCallEnd error:', err));
+      const endFanoutFailures = await sendFederatedCallEnd(dmChannelId, userId);
+      emitFanoutUndeliverable(
+        userId,
+        dmChannelId,
+        fedIdEndRow?.federatedId ?? null,
+        'end',
+        endFanoutFailures,
+      );
       return;
     }
   }
@@ -2026,13 +2048,44 @@ function emitUndeliverableAndMaybeDestroy(args: {
   });
 }
 
-async function sendFederatedCallAccept(dmChannelId: string, acceptorUserId: string): Promise<void> {
+/**
+ * Emit a non-terminal dm_call_undeliverable to the local user whose Path-1 action
+ * (accept / reject / end) had one or more fan-out failures reach peers.
+ * No-op when there were no failures or no federatedId to reference.
+ */
+function emitFanoutUndeliverable(
+  userId: string,
+  dmChannelId: string | null,
+  federatedId: string | null | undefined,
+  phase: 'accept' | 'reject' | 'end',
+  fanoutFailures: CallFanoutFailure[],
+): void {
+  if (fanoutFailures.length === 0 || !federatedId) return;
+  const failures: DmCallUndeliverableFailure[] = fanoutFailures.map(f => ({
+    reason: f.reason,
+    peerOrigin: f.origin,
+    peerLabel: f.peerLabel,
+  }));
+  connectionManager.sendToUser(userId, {
+    type: 'dm_call_undeliverable',
+    dmChannelId,
+    federatedCallId: federatedId,
+    terminal: false,
+    phase,
+    failures,
+  });
+}
+
+async function sendFederatedCallAccept(
+  dmChannelId: string,
+  acceptorUserId: string,
+): Promise<CallFanoutFailure[]> {
   const db = getDb();
   const channel = db.select({ federatedId: schema.dmChannels.federatedId })
     .from(schema.dmChannels)
     .where(eq(schema.dmChannels.id, dmChannelId))
     .get();
-  if (!channel?.federatedId) return;
+  if (!channel?.federatedId) return [];
 
   const members = db.select({ homeInstance: schema.users.homeInstance })
     .from(schema.dmMembers)
@@ -2048,7 +2101,7 @@ async function sendFederatedCallAccept(dmChannelId: string, acceptorUserId: stri
       if (normalized !== ourOrigin) targets.add(normalized);
     }
   }
-  if (targets.size === 0) return;
+  if (targets.size === 0) return [];
 
   const user = db.select({ homeUserId: schema.users.homeUserId })
     .from(schema.users)
@@ -2067,22 +2120,41 @@ async function sendFederatedCallAccept(dmChannelId: string, acceptorUserId: stri
     },
   };
 
-  await Promise.all(
-    Array.from(targets).map(origin =>
-      sendCallRelay(origin, [event]).catch(err =>
-        console.error(`[federation] Failed to send dm_call_accept to ${origin}:`, err)
-      )
-    )
+  const labelByOrigin = new Map<string, string | null>();
+  for (const r of db.select({ origin: schema.federationPeers.origin, instanceName: schema.federationPeers.instanceName })
+    .from(schema.federationPeers)
+    .all()) {
+    labelByOrigin.set(r.origin, r.instanceName ?? null);
+  }
+
+  const results = await Promise.all(
+    Array.from(targets).map(async origin => ({ origin, result: await sendCallRelay(origin, [event]) })),
   );
+
+  const failures: CallFanoutFailure[] = [];
+  for (const { origin, result } of results) {
+    if (!result.ok) {
+      console.error(`[federation] dm_call_accept fanout to ${origin} failed (${result.reason}): ${result.error}`);
+      failures.push({
+        origin,
+        peerLabel: labelByOrigin.get(origin) ?? undefined,
+        reason: mapCallReasonToEventReason(result.reason),
+      });
+    }
+  }
+  return failures;
 }
 
-async function sendFederatedCallEnd(dmChannelId: string, endedByUserId: string): Promise<void> {
+async function sendFederatedCallEnd(
+  dmChannelId: string,
+  endedByUserId: string,
+): Promise<CallFanoutFailure[]> {
   const db = getDb();
   const channel = db.select({ federatedId: schema.dmChannels.federatedId })
     .from(schema.dmChannels)
     .where(eq(schema.dmChannels.id, dmChannelId))
     .get();
-  if (!channel?.federatedId) return;
+  if (!channel?.federatedId) return [];
 
   const members = db.select({ homeInstance: schema.users.homeInstance })
     .from(schema.dmMembers)
@@ -2098,9 +2170,8 @@ async function sendFederatedCallEnd(dmChannelId: string, endedByUserId: string):
       if (normalized !== ourOrigin) targets.add(normalized);
     }
   }
-  if (targets.size === 0) return;
+  if (targets.size === 0) return [];
 
-  // Resolve actual homeUserId from DB
   const endUser = db.select({ homeUserId: schema.users.homeUserId })
     .from(schema.users)
     .where(eq(schema.users.id, endedByUserId))
@@ -2118,13 +2189,29 @@ async function sendFederatedCallEnd(dmChannelId: string, endedByUserId: string):
     },
   };
 
-  await Promise.all(
-    Array.from(targets).map(origin =>
-      sendCallRelay(origin, [event]).catch(err =>
-        console.error(`[federation] Failed to send dm_call_end to ${origin}:`, err)
-      )
-    )
+  const labelByOrigin = new Map<string, string | null>();
+  for (const r of db.select({ origin: schema.federationPeers.origin, instanceName: schema.federationPeers.instanceName })
+    .from(schema.federationPeers)
+    .all()) {
+    labelByOrigin.set(r.origin, r.instanceName ?? null);
+  }
+
+  const results = await Promise.all(
+    Array.from(targets).map(async origin => ({ origin, result: await sendCallRelay(origin, [event]) })),
   );
+
+  const failures: CallFanoutFailure[] = [];
+  for (const { origin, result } of results) {
+    if (!result.ok) {
+      console.error(`[federation] dm_call_end fanout to ${origin} failed (${result.reason}): ${result.error}`);
+      failures.push({
+        origin,
+        peerLabel: labelByOrigin.get(origin) ?? undefined,
+        reason: mapCallReasonToEventReason(result.reason),
+      });
+    }
+  }
+  return failures;
 }
 
 // ─── Voice Moderation Handlers ──────────────────────────────────────────────