diff --git a/src/dailyai/pipeline/frames.py b/src/dailyai/pipeline/frames.py
index d0d279bd9..09f206c87 100644
--- a/src/dailyai/pipeline/frames.py
+++ b/src/dailyai/pipeline/frames.py
@@ -95,9 +95,19 @@ class OpenAILLMContextFrame(Frame):
     context: OpenAILLMContext
 
 
-class AppMessageQueueFrame(Frame):
+@dataclass()
+class ReceivedAppMessageFrame(Frame):
     message: Any
-    participantId: str
+    sender: str
+
+    def __str__(self):
+        return f"ReceivedAppMessageFrame: sender: {self.sender}, message: {self.message}"
+
+
+@dataclass()
+class SendAppMessageFrame(Frame):
+    message: Any
+    participantId: str | None
 
 
 class UserStartedSpeakingFrame(Frame):
diff --git a/src/dailyai/services/base_transport_service.py b/src/dailyai/services/base_transport_service.py
index a24a5dc48..316ba7be2 100644
--- a/src/dailyai/services/base_transport_service.py
+++ b/src/dailyai/services/base_transport_service.py
@@ -8,11 +8,13 @@ import torch
 import queue
 import threading
 import time
-from typing import AsyncGenerator
+from typing import Any, AsyncGenerator
 from enum import Enum
 from dailyai.pipeline.frame_processor import FrameProcessor
 
 from dailyai.pipeline.frames import (
+    ReceivedAppMessageFrame,
+    SendAppMessageFrame,
     AudioFrame,
     EndFrame,
     ImageFrame,
@@ -317,9 +319,10 @@ class BaseTransportService:
                 self._vad_state == VADState.STARTING
                 and self._vad_starting_count >= self._vad_start_frames
             ):
-                asyncio.run_coroutine_threadsafe(
-                    self.receive_queue.put(UserStartedSpeakingFrame()), self._loop
-                )
+                if self._loop:
+                    asyncio.run_coroutine_threadsafe(
+                        self.receive_queue.put(UserStartedSpeakingFrame()), self._loop
+                    )
                 # self.interrupt()
                 self._vad_state = VADState.SPEAKING
                 self._vad_starting_count = 0
@@ -327,9 +330,10 @@ class BaseTransportService:
                 self._vad_state == VADState.STOPPING
                 and self._vad_stopping_count >= self._vad_stop_frames
             ):
-                asyncio.run_coroutine_threadsafe(
-                    self.receive_queue.put(UserStoppedSpeakingFrame()), self._loop
-                )
+                if self._loop:
+                    asyncio.run_coroutine_threadsafe(
+                        self.receive_queue.put(UserStoppedSpeakingFrame()), self._loop
+                    )
                 self._vad_state = VADState.QUIET
                 self._vad_stopping_count = 0
 
@@ -375,6 +379,10 @@ class BaseTransportService:
     def _set_images(self, images: list[bytes], start_frame=0):
         self._images = itertools.cycle(images)
 
+    def send_app_message(self, message: Any, participantId:str|None):
+        """ Child classes should override this to send a custom message to the room. """
+        pass
+
     def _run_camera(self):
         try:
             while not self._stop_threads.is_set():
@@ -440,6 +448,8 @@ class BaseTransportService:
                                 self._set_image(frame.image)
                             elif isinstance(frame, SpriteFrame):
                                 self._set_images(frame.images)
+                            elif isinstance(frame, SendAppMessageFrame):
+                                self.send_app_message(frame.message, frame.participantId)
                         elif len(b):
                             self.write_frame_to_mic(bytes(b))
                             b = bytearray()
diff --git a/src/dailyai/services/daily_transport_service.py b/src/dailyai/services/daily_transport_service.py
index 16c8519ba..aacb74a3c 100644
--- a/src/dailyai/services/daily_transport_service.py
+++ b/src/dailyai/services/daily_transport_service.py
@@ -6,8 +6,10 @@ import threading
 import types
 
 from functools import partial
+from typing import Any
 
 from dailyai.pipeline.frames import (
+    ReceivedAppMessageFrame,
     TranscriptionQueueFrame,
 )
 
@@ -124,6 +126,9 @@ class DailyTransportService(BaseTransportService, EventHandler):
     def write_frame_to_mic(self, frame: bytes):
         self.mic.write_frames(frame)
 
+    def send_app_message(self, message: Any, participantId: str | None):
+        self.client.send_app_message(message, participantId)
+
     def read_audio_frames(self, desired_frame_count):
         bytes = self._speaker.read_frames(desired_frame_count)
         return bytes
@@ -219,7 +224,7 @@ class DailyTransportService(BaseTransportService, EventHandler):
         pass
 
     def call_joined(self, join_data, client_error):
-        #self._logger.info(f"Call_joined: {join_data}, {client_error}")
+        # self._logger.info(f"Call_joined: {join_data}, {client_error}")
         pass
 
     def dialout(self, number):
@@ -243,8 +248,13 @@ class DailyTransportService(BaseTransportService, EventHandler):
         if len(self.client.participants()) < self._min_others_count + 1:
             self._stop_threads.set()
 
-    def on_app_message(self, message, sender):
-        pass
+    def on_app_message(self, message:Any, sender:str):
+        if self._loop:
+            frame = ReceivedAppMessageFrame(message, sender)
+            print(frame)
+            asyncio.run_coroutine_threadsafe(
+                self.receive_queue.put(frame), self._loop
+            )
 
     def on_transcription_message(self, message: dict):
         if self._loop: