diff --git a/.env.example b/.env.example
index a2dda43..981b1bc 100644
--- a/.env.example
+++ b/.env.example
@@ -58,6 +58,11 @@ POSTGRES_POOL_MAX=10                    # Maximum pool connections (default: 10)
 # === Redis ===
 REDIS_URL=redis://localhost:6379        # Redis connection string (default: redis://localhost:6379)
 
+# === Voice PCM WebSocket (direct gateway→backend, bypasses Redis) ===
+VOICE_PCM_WS_ENABLED=true               # Use direct WS for PCM audio (default: true)
+BACKEND_WS_URL=ws://backend:3000/ws     # Backend WebSocket URL for gateway PCM streaming
+BACKEND_WS_TOKEN=                       # REQUIRED if VOICE_PCM_WS_ENABLED=true. Internal shared secret
+
 # === Attachments ===
 TELE_UPLOAD_URL=https://upload.asepharyana.my.id/api/upload   # Attachment upload endpoint (default)
 ATTACHMENT_UPLOAD_TIMEOUT_MS=30000      # Upload timeout in ms (default: 30000)
diff --git a/services/discord-gateway/src/modules/voice-recording/recorder.ts b/services/discord-gateway/src/modules/voice-recording/recorder.ts
index 32c3b63..5775e08 100644
--- a/services/discord-gateway/src/modules/voice-recording/recorder.ts
+++ b/services/discord-gateway/src/modules/voice-recording/recorder.ts
@@ -141,7 +141,7 @@ export async function startRecording(
     activeSessions,
     recordingsDir,
     pcmSender: _pcmWsClient
-      ? (pcm, userId) => _pcmWsClient.sendPcm(userId, pcm)
+      ? (pcm, userId) => _pcmWsClient!.sendPcm(userId, pcm)
       : undefined,
   });