diff --git a/src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/LlmContexts/LeaveVoicemailArgs.cs b/src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/LlmContexts/LeaveVoicemailArgs.cs
index 85cc3913..bd0b1c9a 100644
--- a/src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/LlmContexts/LeaveVoicemailArgs.cs
+++ b/src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/LlmContexts/LeaveVoicemailArgs.cs
@@ -4,9 +4,6 @@ namespace BotSharp.Plugin.Twilio.OutboundPhoneCallHandler.LlmContexts;
 
 public class LeaveVoicemailArgs
 {
-    [JsonPropertyName("phone_number")]
-    public string PhoneNumber { get; set; } = null!;
-
     [JsonPropertyName("voicemail_message")]
     public string VoicemailMessage { get; set; } = null!;
 }
diff --git a/src/Plugins/BotSharp.Plugin.Twilio/data/agents/6745151e-6d46-4a02-8de4-1c4f21c7da95/functions/util-twilio-leave_voicemail.json b/src/Plugins/BotSharp.Plugin.Twilio/data/agents/6745151e-6d46-4a02-8de4-1c4f21c7da95/functions/util-twilio-leave_voicemail.json
index 53307a83..514fdefd 100644
--- a/src/Plugins/BotSharp.Plugin.Twilio/data/agents/6745151e-6d46-4a02-8de4-1c4f21c7da95/functions/util-twilio-leave_voicemail.json
+++ b/src/Plugins/BotSharp.Plugin.Twilio/data/agents/6745151e-6d46-4a02-8de4-1c4f21c7da95/functions/util-twilio-leave_voicemail.json
@@ -8,12 +8,8 @@
       "voicemail_message": {
         "type": "string",
         "description": "User voicemail with details."
-      },
-      "phone_number": {
-        "type": "string",
-        "description": "Phone number to callback."
       }
     },
-    "required": [ "voicemail_message", "phone_number" ]
+    "required": [ "voicemail_message" ]
   }
 }
\ No newline at end of file