diff --git a/src/Plugins/BotSharp.Plugin.Twilio/Models/ConversationalVoiceRequest.cs b/src/Plugins/BotSharp.Plugin.Twilio/Models/ConversationalVoiceRequest.cs
index b5a55561..d9dde562 100644
--- a/src/Plugins/BotSharp.Plugin.Twilio/Models/ConversationalVoiceRequest.cs
+++ b/src/Plugins/BotSharp.Plugin.Twilio/Models/ConversationalVoiceRequest.cs
@@ -39,9 +39,6 @@ public class ConversationalVoiceRequest : VoiceRequest
     [FromForm]
     public int MachineDetectionDuration { get; set; }
 
-    [FromForm]
-    public int Duration { get; set; }
-
     [FromForm]
     public int CallDuration { get; set; }