feat: telephony call transfer (#155)

* transfer call

* fix: ignore completed call status

* chore: refactor telephony

* chore: refactor pipecat engine custom tools and other telephony services

* chore: code refactor

* chore: put back office ambient sound files

* chore: remove transport from engine

* fix: fix alembic revision

* chore: remove set_transferring_call from engine

* fix: send OutputAudio frame and let transport chunk it

* fix: reinstate docker compose

* chore: remove unused transfer-twmil route for caller

* chore: update pipecat submodule

---------

Co-authored-by: Abhishek Kumar <abhishek@a6k.me>

api/services/pipecat/event_handlers.py

@@ -80,6 +80,7 @@ def register_event_handlers(
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(_transport, _participant):
         call_disposed = engine.is_call_disposed()
+
         logger.debug(
             f"In on_client_disconnected callback handler. Call disposed: {call_disposed}"
         )
@@ -87,7 +88,6 @@ def register_event_handlers(
         # Stop recordings
         await audio_buffer.stop_recording()
 
-        # End the call
         await engine.end_call_with_reason(
             EndTaskReason.USER_HANGUP.value, abort_immediately=True
         )

api/services/pipecat/run_pipeline.py

@@ -552,11 +552,12 @@ async def _run_pipeline(
         embeddings_base_url=embeddings_base_url,
     )
 
-    # Create pipeline components with audio configuration
+    # Create pipeline components
     audio_buffer, context = create_pipeline_components(audio_config)
 
-    # Set the context and audio_buffer after creation
+    # Set the context, audio_config, and audio_buffer after creation
     engine.set_context(context)
+    engine.set_audio_config(audio_config)
 
     # Set Stasis connection for immediate transfers (if available)
     if stasis_connection: