diff --git a/src/libs/Ultravox/Generated/Ultravox.CallsClient.CallsCreate.g.cs b/src/libs/Ultravox/Generated/Ultravox.CallsClient.CallsCreate.g.cs
index f4b7c56..d06cd2e 100644
--- a/src/libs/Ultravox/Generated/Ultravox.CallsClient.CallsCreate.g.cs
+++ b/src/libs/Ultravox/Generated/Ultravox.CallsClient.CallsCreate.g.cs
@@ -56,7 +56,7 @@ partial void ProcessCallsCreateResponseContent(
                 path: "/api/calls",
                 baseUri: HttpClient.BaseAddress); 
             __pathBuilder
-                .AddOptionalParameter("enableGreetingPrompt", enableGreetingPrompt?.ToString())
+                .AddOptionalParameter("enableGreetingPrompt", enableGreetingPrompt?.ToString().ToLowerInvariant())
                 .AddOptionalParameter("priorCallId", priorCallId?.ToString()) 
                 ; 
             var __path = __pathBuilder.ToString();