Add changelog and improve docstring for parse_telephony_websocket

- Added changelog entry for bug fix
- Enhanced docstring with Args and Raises sections

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

changelog/3629.fixed.md

@@ -0,0 +1 @@
+- Fixed `StopAsyncIteration` exceptions in `parse_telephony_websocket()` when WebSocket connections close before sending expected messages.

src/pipecat/runner/utils.py

@@ -96,6 +96,9 @@ def _detect_transport_type_from_message(message_data: dict) -> str:
 async def parse_telephony_websocket(websocket: WebSocket):
     """Parse telephony WebSocket messages and return transport type and call data.
 
+    Args:
+        websocket: FastAPI WebSocket connection from telephony provider.
+
     Returns:
         tuple: (transport_type: str, call_data: dict)
 
@@ -136,6 +139,9 @@ async def parse_telephony_websocket(websocket: WebSocket):
                 "to": str,
             }
 
+    Raises:
+        ValueError: If WebSocket closes before sending any messages.
+
     Example usage::
 
         transport_type, call_data = await parse_telephony_websocket(websocket)