diff --git a/src/pipecat/serializers/twilio.py b/src/pipecat/serializers/twilio.py
index 8836fcd6d..583234ae4 100644
--- a/src/pipecat/serializers/twilio.py
+++ b/src/pipecat/serializers/twilio.py
@@ -9,7 +9,7 @@ import json
 
 from pydantic import BaseModel
 
-from pipecat.frames.frames import AudioRawFrame, Frame
+from pipecat.frames.frames import AudioRawFrame, Frame, StartInterruptionFrame
 from pipecat.serializers.base_serializer import FrameSerializer
 from pipecat.utils.audio import ulaw_to_pcm, pcm_to_ulaw
 
@@ -28,22 +28,25 @@ class TwilioFrameSerializer(FrameSerializer):
         self._params = params
 
     def serialize(self, frame: Frame) -> str | bytes | None:
-        if not isinstance(frame, AudioRawFrame):
-            return None
+        if isinstance(frame, AudioRawFrame):
+            data = frame.audio
 
-        data = frame.audio
-
-        serialized_data = pcm_to_ulaw(data, frame.sample_rate, self._params.twilio_sample_rate)
-        payload = base64.b64encode(serialized_data).decode("utf-8")
-        answer = {
-            "event": "media",
-            "streamSid": self._stream_sid,
-            "media": {
-                "payload": payload
+            serialized_data = pcm_to_ulaw(
+                data, frame.sample_rate, self._params.twilio_sample_rate)
+            payload = base64.b64encode(serialized_data).decode("utf-8")
+            answer = {
+                "event": "media",
+                "streamSid": self._stream_sid,
+                "media": {
+                    "payload": payload
+                }
             }
-        }
 
-        return json.dumps(answer)
+            return json.dumps(answer)
+
+        if isinstance(frame, StartInterruptionFrame):
+            answer = {"event": "clear", "streamSid": self._stream_sid}
+            return json.dumps(answer)
 
     def deserialize(self, data: str | bytes) -> Frame | None:
         message = json.loads(data)
diff --git a/src/pipecat/transports/network/fastapi_websocket.py b/src/pipecat/transports/network/fastapi_websocket.py
index 914870114..16c5e81fc 100644
--- a/src/pipecat/transports/network/fastapi_websocket.py
+++ b/src/pipecat/transports/network/fastapi_websocket.py
@@ -12,8 +12,8 @@ import wave
 from typing import Awaitable, Callable
 from pydantic.main import BaseModel
 
-from pipecat.frames.frames import AudioRawFrame, CancelFrame, EndFrame, StartFrame
-from pipecat.processors.frame_processor import FrameProcessor
+from pipecat.frames.frames import AudioRawFrame, CancelFrame, EndFrame, Frame, StartFrame, StartInterruptionFrame
+from pipecat.processors.frame_processor import FrameDirection, FrameProcessor
 from pipecat.serializers.base_serializer import FrameSerializer
 from pipecat.transports.base_input import BaseInputTransport
 from pipecat.transports.base_output import BaseOutputTransport
@@ -93,11 +93,18 @@ class FastAPIWebsocketOutputTransport(BaseOutputTransport):
         self._params = params
         self._websocket_audio_buffer = bytes()
 
+    async def process_frame(self, frame: Frame, direction: FrameDirection):
+        await super().process_frame(frame, direction)
+
+        if isinstance(frame, StartInterruptionFrame):
+            await self._write_frame(frame)
+
     async def write_raw_audio_frames(self, frames: bytes):
         self._websocket_audio_buffer += frames
         while len(self._websocket_audio_buffer) >= self._params.audio_frame_size:
             frame = AudioRawFrame(
-                audio=self._websocket_audio_buffer[:self._params.audio_frame_size],
+                audio=self._websocket_audio_buffer[:
+                                                   self._params.audio_frame_size],
                 sample_rate=self._params.audio_out_sample_rate,
                 num_channels=self._params.audio_out_channels
             )
@@ -121,7 +128,13 @@ class FastAPIWebsocketOutputTransport(BaseOutputTransport):
             if payload and self._websocket.client_state == WebSocketState.CONNECTED:
                 await self._websocket.send_text(payload)
 
-            self._websocket_audio_buffer = self._websocket_audio_buffer[self._params.audio_frame_size:]
+            self._websocket_audio_buffer = self._websocket_audio_buffer[
+                self._params.audio_frame_size:]
+
+    async def _write_frame(self, frame: Frame):
+        payload = self._params.serializer.serialize(frame)
+        if payload and self._websocket.client_state == WebSocketState.CONNECTED:
+            await self._websocket.send_text(payload)
 
 
 class FastAPIWebsocketTransport(BaseTransport):