improvements to TransferCall action

* move to_phone to be a parameter (instead of in the config) so you can dynamically adjust who to send to
* use proper Twilio rest sdk rather than raw http calls

vocode/streaming/action/transfer_call.py

@@ -1,9 +1,7 @@
 import os
-import aiohttp
-
-from aiohttp import BasicAuth
 from typing import Type
 from pydantic.v1 import BaseModel, Field
+from twilio.rest import Client
 
 from vocode.streaming.action.phone_call_action import TwilioPhoneCallAction
 from vocode.streaming.models.actions import (
@@ -13,61 +11,39 @@
     ActionType,
 )
 
-
 class TransferCallActionConfig(ActionConfig, type=ActionType.TRANSFER_CALL):
-    to_phone: str
-
-
-class TransferCallParameters(BaseModel):
     pass
 
+class TransferCallParameters(BaseModel):
+    to_phone: str = Field(..., description="phone number to transfer the call to")
 
 class TransferCallResponse(BaseModel):
     status: str = Field("success", description="status of the transfer")
 
-
 class TransferCall(
     TwilioPhoneCallAction[
         TransferCallActionConfig, TransferCallParameters, TransferCallResponse
     ]
 ):
-    description: str = (
-        "transfers the call. use when you need to connect the active call to another phone line."
-    )
+    description: str = "transfers the call. use when you need to connect the active call to another phone line."
     parameters_type: Type[TransferCallParameters] = TransferCallParameters
     response_type: Type[TransferCallResponse] = TransferCallResponse
 
     async def transfer_call(self, twilio_call_sid, to_phone):
         twilio_account_sid = os.environ["TWILIO_ACCOUNT_SID"]
         twilio_auth_token = os.environ["TWILIO_AUTH_TOKEN"]
+        client = Client(twilio_account_sid, twilio_auth_token)
 
-        url = "https://api.twilio.com/2010-04-01/Accounts/{twilio_account_sid}/Calls/{twilio_auth_token}.json".format(
-            twilio_account_sid=twilio_account_sid, twilio_auth_token=twilio_call_sid
-        )
-
-        twiml_data = "<Response><Dial>{to_phone}</Dial></Response>".format(
-            to_phone=to_phone
-        )
-
-        payload = {"Twiml": twiml_data}
+        twiml = f"<Response><Dial>{to_phone}</Dial></Response>"
+        call = client.calls(twilio_call_sid).update(twiml=twiml)
 
-        auth = BasicAuth(twilio_account_sid, twilio_auth_token)
-
-        async with aiohttp.ClientSession(auth=auth) as session:
-            async with session.post(url, data=payload) as response:
-                if response.status != 200:
-                    print(await response.text())
-                    raise Exception("failed to update call")
-                else:
-                    return await response.json()
+        return call
 
     async def run(
         self, action_input: ActionInput[TransferCallParameters]
     ) -> ActionOutput[TransferCallResponse]:
         twilio_call_sid = self.get_twilio_sid(action_input)
-
-        await self.transfer_call(twilio_call_sid, self.action_config.to_phone)
-
+        await self.transfer_call(twilio_call_sid, action_input.params.to_phone)
         return ActionOutput(
             action_type=action_input.action_config.type,
             response=TransferCallResponse(status="success"),