diff --git a/src/Infrastructure/BotSharp.Abstraction/Infrastructures/Enums/StateConst.cs b/src/Infrastructure/BotSharp.Abstraction/Infrastructures/Enums/StateConst.cs
index 038699ac..4b1af0e2 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Infrastructures/Enums/StateConst.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Infrastructures/Enums/StateConst.cs
@@ -17,4 +17,5 @@ public class StateConst
     public const string SUB_CONVERSATION_ID = "sub_conversation_id";
     public const string ORIGIN_CONVERSATION_ID = "origin_conversation_id";
     public const string WEB_DRIVER_TASK_ID = "web_driver_task_id";
+    public const string PHONE_CALL_SUCCESSED = "phone_call_successed";
 }
diff --git a/src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/Functions/OutboundPhoneCallFn.cs b/src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/Functions/OutboundPhoneCallFn.cs
index b5ecf101..a8b786fe 100644
--- a/src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/Functions/OutboundPhoneCallFn.cs
+++ b/src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/Functions/OutboundPhoneCallFn.cs
@@ -7,6 +7,7 @@ using BotSharp.Core.Infrastructures;
 using BotSharp.Plugin.Twilio.Interfaces;
 using BotSharp.Plugin.Twilio.Models;
 using BotSharp.Plugin.Twilio.OutboundPhoneCallHandler.LlmContexts;
+using Microsoft.AspNetCore.Cors.Infrastructure;
 using Twilio.Rest.Api.V2010.Account;
 using Twilio.Types;
 using Conversation = BotSharp.Abstraction.Conversations.Models.Conversation;
@@ -123,6 +124,7 @@ public class OutboundPhoneCallFn : IFunctionCallback
             var originConversationId = convService.ConversationId;
             var entryAgentId = routing.EntryAgentId;
 
+            states.SetState(StateConst.PHONE_CALL_SUCCESSED, true);
             await ForkConversation(args, entryAgentId, originConversationId, newConversationId, call);
 
             message.Content = $"The call has been successfully queued. The initial information is as follows: {args.InitialMessage}.";
@@ -130,6 +132,7 @@ public class OutboundPhoneCallFn : IFunctionCallback
         }
         else
         {
+            states.SetState(StateConst.PHONE_CALL_SUCCESSED, false);
             message.Content = $"Failed to make a call, status is {call.Status}.";
             return false;
         }