diff --git a/src/realtime_ai/aio/realtime_ai_client.py b/src/realtime_ai/aio/realtime_ai_client.py
index 70b8273..050449c 100644
--- a/src/realtime_ai/aio/realtime_ai_client.py
+++ b/src/realtime_ai/aio/realtime_ai_client.py
@@ -148,7 +148,7 @@ async def generate_response_from_function_call(self, call_id: str, function_outp
             "event_id": self.service_manager._generate_event_id(),
             "type": "conversation.item.create",
             "item": {
-                "id": str(uuid.uuid4()),  # Generate a unique item ID
+                "id": str(uuid.uuid4()).replace('-', ''),
                 "type": "function_call_output",
                 "call_id": call_id,
                 "output": function_output,
diff --git a/src/realtime_ai/realtime_ai_client.py b/src/realtime_ai/realtime_ai_client.py
index dd988de..6895736 100644
--- a/src/realtime_ai/realtime_ai_client.py
+++ b/src/realtime_ai/realtime_ai_client.py
@@ -1,6 +1,6 @@
 import threading, logging
 import concurrent.futures
-import queue, time
+import queue, time, uuid
 
 from realtime_ai.models.realtime_ai_options import RealtimeAIOptions
 from realtime_ai.models.audio_stream_options import AudioStreamOptions
@@ -134,7 +134,7 @@ def generate_response_from_function_call(self, call_id: str, function_output: st
             "event_id": self.service_manager._generate_event_id(),
             "type": "conversation.item.create",
             "item": {
-                "id": "1234", # Unique item ID
+                "id": str(uuid.uuid4()).replace('-', ''),
                 "type": "function_call_output",
                 "call_id": call_id,
                 "output": function_output,