.

core/filler_audio.py

@@ -67,11 +67,13 @@ class FillerAudioLibrary:
                 {key: len(value) for key, value in self._clips.items()},
             )
 
-    def pick(self, key: str | None = None) -> bytes | None:
+    def pick(self, key: str | None = None, *, allow_fallback: bool = True) -> bytes | None:
         if not self._enabled:
             return None
         normalized_key = (key or "").strip().lower() or "generic"
-        candidates = self._clips.get(normalized_key) or self._clips.get("generic") or []
+        candidates = self._clips.get(normalized_key) or []
+        if not candidates and allow_fallback:
+            candidates = self._clips.get("generic") or []
         if not candidates:
             LOGGER.info("filler audio pick missed: key=%s available=%s", normalized_key, list(self._clips))
             return None

core/session.py

@@ -1840,7 +1840,11 @@ class CallSession:
     ) -> None:
         first_audio_seen = False
         started_monotonic = time.perf_counter()
-        cached_greeting = self._filler_audio.pick("initial_greeting") if self._filler_audio is not None else None
+        cached_greeting = (
+            self._filler_audio.pick("initial_greeting", allow_fallback=False)
+            if self._filler_audio is not None
+            else None
+        )
         if cached_greeting:
             await self._play_cached_initial_greeting(
                 epoch=epoch,