diff --git a/src/activities/Elsa.Activities.Telnyx/Activities/CallRingGroup.cs b/src/activities/Elsa.Activities.Telnyx/Activities/CallRingGroup.cs
index 5f16e36ee..7ddd47ff4 100644
--- a/src/activities/Elsa.Activities.Telnyx/Activities/CallRingGroup.cs
+++ b/src/activities/Elsa.Activities.Telnyx/Activities/CallRingGroup.cs
@@ -98,6 +98,15 @@ namespace Elsa.Activities.Telnyx.Activities
             get => GetState(() => Duration.FromSeconds(20));
             set => SetState(value);
         }
+        
+        [ActivityInput(
+            Hint = "Enables Answering Machine Detection.",
+            UIHint = ActivityInputUIHints.Dropdown,
+            Options = new[] {"disabled", "detect", "detect_beep", "detect_words", "greeting_end"},
+            DefaultValue = "disabled",
+            Category = PropertyCategories.Advanced,
+            SupportedSyntaxes = new[] {SyntaxNames.Literal, SyntaxNames.JavaScript, SyntaxNames.Liquid})]
+        public string? AnsweringMachineDetection { get; set; } = "disabled";
 
         private CallAnsweredPayload? CallAnsweredPayload
         {
diff --git a/src/activities/Elsa.Activities.Telnyx/Activities/Dial.cs b/src/activities/Elsa.Activities.Telnyx/Activities/Dial.cs
index a330d384a..e432ce0b9 100644
--- a/src/activities/Elsa.Activities.Telnyx/Activities/Dial.cs
+++ b/src/activities/Elsa.Activities.Telnyx/Activities/Dial.cs
@@ -60,9 +60,10 @@ namespace Elsa.Activities.Telnyx.Activities
         [ActivityInput(
             Hint = "Enables Answering Machine Detection.",
             UIHint = ActivityInputUIHints.Dropdown,
-            Options = new[] { "disabled", "detect", "detect_beep", "detect_words", "greeting_end" },
-            SupportedSyntaxes = new[] { SyntaxNames.Literal, SyntaxNames.JavaScript, SyntaxNames.Liquid })]
-        public string? AnsweringMachineDetection { get; set; }
+            Options = new[] {"disabled", "detect", "detect_beep", "detect_words", "greeting_end"},
+            DefaultValue = "disabled",
+            SupportedSyntaxes = new[] {SyntaxNames.Literal, SyntaxNames.JavaScript, SyntaxNames.Liquid})]
+        public string? AnsweringMachineDetection { get; set; } = "disabled";
 
         [ActivityInput(
             Label = "Answering Machine Detection Configuration",