diff --git a/vocode/models/telephony.py b/vocode/models/telephony.py
index 47afa98..c161996 100644
--- a/vocode/models/telephony.py
+++ b/vocode/models/telephony.py
@@ -10,13 +10,6 @@ class TwilioConfig(BaseModel):
     auth_token: str
 
 
-class InternalTwilioConfig(BaseModel):
-    account_sid: str
-    api_key: str
-    api_secret: str
-    outgoing_application_sid: str
-
-
 class CallEntity(BaseModel):
     phone_number: str
 
@@ -31,6 +24,7 @@ class CreateInboundCall(BaseModel):
 
 class EndOutboundCall(BaseModel):
     call_id: str
+    twilio_config: Optional[TwilioConfig] = None
 
 
 class CreateOutboundCall(BaseModel):
diff --git a/vocode/telephony/inbound_call_server.py b/vocode/telephony/inbound_call_server.py
index 35fc5f4..64c1d01 100644
--- a/vocode/telephony/inbound_call_server.py
+++ b/vocode/telephony/inbound_call_server.py
@@ -6,11 +6,10 @@ from vocode.models.synthesizer import SynthesizerConfig
 from twilio.jwt.access_token.grants import VoiceGrant
 
 from vocode.models.transcriber import TranscriberConfig
-from vocode.telephony.utils import create_access_token
 from .. import api_key, BASE_URL
 
 from ..models.agent import AgentConfig
-from ..models.telephony import CreateInboundCall, InternalTwilioConfig, TwilioConfig
+from ..models.telephony import CreateInboundCall, TwilioConfig, TwilioConfig
 
 VOCODE_INBOUND_CALL_URL = f"https://{BASE_URL}/create_inbound_call"
 
@@ -22,7 +21,7 @@ class InboundCallServer:
         transcriber_config: Optional[TranscriberConfig] = None,
         synthesizer_config: Optional[SynthesizerConfig] = None,
         response_on_rate_limit: Optional[str] = None,
-        internal_twilio_config: Optional[InternalTwilioConfig] = None,
+        twilio_config: Optional[TwilioConfig] = None,
     ):
         self.agent_config = agent_config
         self.transcriber_config = transcriber_config
@@ -33,20 +32,7 @@ class InboundCallServer:
             response_on_rate_limit
             or "The line is really busy right now, check back later!"
         )
-        self.internal_twilio_config = internal_twilio_config
-
-    def create_twilio_config(self) -> TwilioConfig:
-        access_token = create_access_token(self.internal_twilio_config)
-        access_token.add_grant(
-            VoiceGrant(
-                outgoing_application_sid=self.internal_twilio_config.outgoing_application_sid,
-                incoming_allow=True,
-            )
-        )
-        return TwilioConfig(
-            account_sid=self.internal_twilio_config.account_sid,
-            access_token=access_token.to_jwt(),
-        )
+        self.twilio_config = twilio_config
 
     async def handle_call(self, twilio_sid: str = Form(alias="CallSid")):
         response = requests.post(
@@ -57,6 +43,7 @@ class InboundCallServer:
                 twilio_sid=twilio_sid,
                 transcriber_config=self.transcriber_config,
                 synthesizer_config=self.synthesizer_config,
+                twilio_config=self.twilio_config,
             ).dict(),
         )
         if response.status_code == 429:
diff --git a/vocode/telephony/outbound_call.py b/vocode/telephony/outbound_call.py
index a715c46..0eb864d 100644
--- a/vocode/telephony/outbound_call.py
+++ b/vocode/telephony/outbound_call.py
@@ -2,12 +2,10 @@ from typing import Optional
 from vocode.models.agent import AgentConfig
 from vocode.models.synthesizer import SynthesizerConfig
 from vocode.models.transcriber import TranscriberConfig
-from vocode.telephony.utils import create_access_token
 from ..models.telephony import (
     CallEntity,
     CreateOutboundCall,
     EndOutboundCall,
-    InternalTwilioConfig,
     TwilioConfig,
 )
 import requests
@@ -29,7 +27,7 @@ class OutboundCall:
         transcriber_config: Optional[TranscriberConfig] = None,
         synthesizer_config: Optional[SynthesizerConfig] = None,
         conversation_id: Optional[str] = None,
-        internal_twilio_config: Optional[InternalTwilioConfig] = None,
+        twilio_config: Optional[TwilioConfig] = None,
     ):
         self.recipient = recipient
         self.caller = caller
@@ -37,19 +35,7 @@ class OutboundCall:
         self.transcriber_config = transcriber_config
         self.synthesizer_config = synthesizer_config
         self.conversation_id = conversation_id
-        self.internal_twilio_config = internal_twilio_config
-
-    def create_twilio_config(self) -> TwilioConfig:
-        access_token = create_access_token(self.internal_twilio_config)
-        access_token.add_grant(
-            VoiceGrant(
-                outgoing_application_sid=self.internal_twilio_config.outgoing_application_sid
-            )
-        )
-        return TwilioConfig(
-            account_sid=self.internal_twilio_config.account_sid,
-            access_token=access_token.to_jwt(),
-        )
+        self.twilio_config = twilio_config
 
     def start(self) -> str:
         response = requests.post(
@@ -62,9 +48,7 @@ class OutboundCall:
                 transcriber_config=self.transcriber_config,
                 synthesizer_config=self.synthesizer_config,
                 conversation_id=self.conversation_id,
-                twilio_config=self.create_twilio_config()
-                if self.internal_twilio_config
-                else None,
+                twilio_config=self.twilio_config,
             ).dict(),
         )
         assert response.ok, response.text
@@ -77,6 +61,7 @@ class OutboundCall:
             headers={"Authorization": f"Bearer {api_key}"},
             json=EndOutboundCall(
                 call_id=self.conversation_id,
+                twilio_config=self.twilio_config,
             ).dict(),
         )
-        assert response.ok, response.text
+        assert response.ok or response.status_code == 404, response.text
diff --git a/vocode/telephony/utils.py b/vocode/telephony/utils.py
deleted file mode 100644
index da9f410..0000000
--- a/vocode/telephony/utils.py
+++ /dev/null
@@ -1,12 +0,0 @@
-from twilio.jwt.access_token import AccessToken
-
-from vocode.models.telephony import InternalTwilioConfig
-
-
-def create_access_token(twilio_config: InternalTwilioConfig):
-    return AccessToken(
-        twilio_config.account_sid,
-        twilio_config.api_key,
-        twilio_config.api_secret,
-        identity="user",
-    )
diff --git a/vocode/telephony/zoom_dial_in.py b/vocode/telephony/zoom_dial_in.py
index 5433494..55b3583 100644
--- a/vocode/telephony/zoom_dial_in.py
+++ b/vocode/telephony/zoom_dial_in.py
@@ -6,7 +6,6 @@ from vocode.telephony.outbound_call import OutboundCall
 from ..models.telephony import (
     CallEntity,
     DialIntoZoomCall,
-    InternalTwilioConfig,
     TwilioConfig,
 )
 import requests
@@ -26,7 +25,7 @@ class ZoomDialIn(OutboundCall):
         transcriber_config: Optional[TranscriberConfig] = None,
         synthesizer_config: Optional[SynthesizerConfig] = None,
         conversation_id: Optional[str] = None,
-        internal_twilio_config: Optional[InternalTwilioConfig] = None,
+        twilio_config: Optional[TwilioConfig] = None,
     ):
         super().__init__(
             recipient=recipient,
@@ -35,7 +34,7 @@ class ZoomDialIn(OutboundCall):
             transcriber_config=transcriber_config,
             synthesizer_config=synthesizer_config,
             conversation_id=conversation_id,
-            internal_twilio_config=internal_twilio_config,
+            twilio_config=twilio_config,
         )
         self.zoom_meeting_id = zoom_meeting_id
         self.zoom_meeting_password = zoom_meeting_password
@@ -53,9 +52,7 @@ class ZoomDialIn(OutboundCall):
                 transcriber_config=self.transcriber_config,
                 synthesizer_config=self.synthesizer_config,
                 conversation_id=self.conversation_id,
-                twilio_config=self.create_twilio_config()
-                if self.internal_twilio_config
-                else None,
+                twilio_config=self.twilio_config,
             ).dict(),
         )
         assert response.ok, response.text