feat: add asterisk ARI websocket interface (#159)

* chore: remove old files

* feat: ari outbound dialing

* feat: add websocket configuration for ARI

* feat: handling inbound calls

* delete ext channel from redis on stasis end

* fix: add lock in workflow run update, refactor _handle_stasis_start

* chore: update submodule

---------

Co-authored-by: Sabiha Khan <sabihak89@gmail.com>

api/services/workflow/pipecat_engine.py

@@ -18,7 +18,6 @@ from pipecat.services.llm_service import FunctionCallParams
 from pipecat.utils.enums import EndTaskReason
 
 if TYPE_CHECKING:
-    from api.services.telephony.stasis_rtp_connection import StasisRTPConnection
     from pipecat.frames.frames import Frame
     from pipecat.services.anthropic.llm import AnthropicLLMService
     from pipecat.services.google.llm import GoogleLLMService
@@ -83,9 +82,6 @@ class PipecatEngine:
         self._gathered_context: dict = {}
         self._user_response_timeout_task: Optional[asyncio.Task] = None
 
-        # Stasis connection for immediate transfers
-        self._stasis_connection: Optional["StasisRTPConnection"] = None
-
         # Will be set later in initialize() when we have
         # access to _context
         self._variable_extraction_manager = None
@@ -695,23 +691,6 @@ class PipecatEngine:
         """
         self.task = task
 
-    def set_stasis_connection(
-        self, connection: Optional["StasisRTPConnection"]
-    ) -> None:
-        """Set the Stasis RTP connection for immediate transfers.
-
-        This allows the engine to initiate transfers immediately when XFER
-        disposition is detected, without waiting for pipeline shutdown.
-
-        Args:
-            connection: The StasisRTPConnection instance, or None for non-Stasis transports
-        """
-        self._stasis_connection = connection
-        if connection:
-            logger.debug(
-                f"Stasis connection set for immediate transfers: {connection.channel_id}"
-            )
-
     def set_audio_config(self, audio_config) -> None:
         """Set the audio configuration for the pipeline."""
         self._audio_config = audio_config