diff --git a/extensions/voice-call/src/webhook-security.ts b/extensions/voice-call/src/webhook-security.ts
index 2471d8841..79bd96099 100644
--- a/extensions/voice-call/src/webhook-security.ts
+++ b/extensions/voice-call/src/webhook-security.ts
@@ -25,7 +25,7 @@ export function validateTwilioSignature(
 
   // Sort params alphabetically and append key+value
   const sortedParams = Array.from(params.entries()).sort((a, b) =>
-    a[0].localeCompare(b[0]),
+    a[0] < b[0] ? -1 : a[0] > b[0] ? 1 : 0,
   );
 
   for (const [key, value] of sortedParams) {