refactor: add call strategies, cleanup transfer events

api/services/telephony/ari_manager.py

@@ -284,7 +284,7 @@ class ARIConnection:
                         f"channel={channel_id}, transfer_id={transfer_id}"
                     )
                     asyncio.create_task(
-                        self._handle_transfer_answered(transfer_id, channel_id)
+                        self._handle_destination_answered(transfer_id, channel_id)
                     )
                     return
 
@@ -753,7 +753,7 @@ class ARIConnection:
             )
             return None
 
-    async def _handle_transfer_answered(
+    async def _handle_destination_answered(
         self, transfer_id: str, destination_channel_id: str
     ):
         """Handle transfer destination channel answered - publish success event."""
@@ -780,16 +780,16 @@ class ARIConnection:
                 f"caller={context.original_call_sid} -> destination={destination_channel_id}"
             )
 
-            # Publish transfer success event - this will trigger the bridge swap in serializer
+            # Publish destination answered event - this will trigger the bridge swap in serializer
             success_event = TransferEvent(
-                type=TransferEventType.TRANSFER_ANSWERED,
+                type=TransferEventType.DESTINATION_ANSWERED,
                 transfer_id=transfer_id,
                 original_call_sid=context.original_call_sid,
                 transfer_call_sid=destination_channel_id,
                 conference_name=context.conference_name,
                 message="Transfer destination answered",
                 status="success",
-                action="transfer_success",
+                action="destination_answered",
                 end_call=True,
                 timestamp=time.time(),
             )

api/services/telephony/call_transfer_manager.py

@@ -158,16 +158,10 @@ class CallTransferManager:
                             )
 
                             # Check if this is a completion event
-                            if (
-                                event.type
-                                in [
-                                    TransferEventType.TRANSFER_ANSWERED,  # Call answered = transfer successful
-                                    TransferEventType.TRANSFER_COMPLETED,
-                                    TransferEventType.TRANSFER_FAILED,
-                                    TransferEventType.TRANSFER_CANCELLED,
-                                    TransferEventType.TRANSFER_TIMEOUT,
-                                ]
-                            ):
+                            if event.type in [
+                                TransferEventType.DESTINATION_ANSWERED,
+                                TransferEventType.TRANSFER_FAILED,
+                            ]:
                                 return event
                         except Exception as e:
                             logger.error(f"Failed to parse transfer event: {e}")

api/services/telephony/providers/ari_provider.py

@@ -6,7 +6,6 @@ The ARI WebSocket event listener runs as a separate process (ari_manager.py).
 """
 
 import json
-import time
 from typing import TYPE_CHECKING, Any, Dict, List, Optional
 from urllib.parse import urlparse
 
@@ -393,20 +392,9 @@ class ARIProvider(TelephonyProvider):
         from api.services.telephony.call_transfer_manager import (
             get_call_transfer_manager,
         )
-        from api.services.telephony.transfer_event_protocol import TransferContext
 
-        # Store transfer context for event correlation
+        # Get call transfer manager for event correlation mapping
         call_transfer_manager = await get_call_transfer_manager()
-        context = TransferContext(
-            transfer_id=transfer_id,
-            call_sid=None,  # Will be updated after channel creation
-            target_number=destination,
-            tool_uuid=kwargs.get("tool_uuid", ""),
-            original_call_sid=kwargs.get("original_call_sid", ""),
-            conference_name=conference_name,
-            initiated_at=time.time(),
-        )
-        await call_transfer_manager.store_transfer_context(context, ttl=timeout + 10)
 
         # Build SIP endpoint
         if destination.startswith("SIP/") or destination.startswith("PJSIP/"):
@@ -450,12 +438,6 @@ class ARIProvider(TelephonyProvider):
                 await call_transfer_manager.remove_transfer_context(transfer_id)
                 raise Exception("Failed to create destination channel")
 
-            # Update transfer context with destination channel ID
-            context.call_sid = destination_channel_id
-            await call_transfer_manager.store_transfer_context(
-                context, ttl=timeout + 10
-            )
-
             # Store transfer channel mapping for event correlation
             await call_transfer_manager.store_transfer_channel_mapping(
                 destination_channel_id, transfer_id

api/services/telephony/transfer_event_protocol.py

@@ -13,12 +13,8 @@ from typing import Any, Dict, Optional
 class TransferEventType(str, Enum):
     """Types of transfer events sent between instances."""
 
-    TRANSFER_INITIATED = "transfer_initiated"
-    TRANSFER_ANSWERED = "transfer_answered"
-    TRANSFER_COMPLETED = "transfer_completed"
+    DESTINATION_ANSWERED = "destination_answered"
     TRANSFER_FAILED = "transfer_failed"
-    TRANSFER_CANCELLED = "transfer_cancelled"
-    TRANSFER_TIMEOUT = "transfer_timeout"
 
 
 @dataclass