ElevenLabsTTSService: Only reset the context_id when interruptions are enabled

src/pipecat/services/elevenlabs/tts.py

@@ -642,8 +642,14 @@ class ElevenLabsTTSService(AudioContextWordTTSService):
                     yield TTSStartedFrame()
                     self._started = True
                     self._cumulative_time = 0
-                    # Create new context ID and register it
-                    self._context_id = str(uuid.uuid4())
+                    # If a context ID does not exist, create a new one and
+                    # register it. If an ID exists, that means the Pipeline is
+                    # configured for allow_interruptions=False, so continue
+                    # using the current ID. When interruptions are enabled
+                    # (e.g. allow_interruptions=True), user speech results in
+                    # an interruption, which resets the context ID.
+                    if not self._context_id:
+                        self._context_id = str(uuid.uuid4())
                     await self.create_audio_context(self._context_id)
 
                     # Initialize context with voice settings