diff --git a/js/mzta-utils.js b/js/mzta-utils.js
index 2e359c13..f3a34d3a 100644
--- a/js/mzta-utils.js
+++ b/js/mzta-utils.js
@@ -123,6 +123,16 @@ function compareThunderbirdVersions(v1, v2) {
   return 0;
 }
 
+function generateCallID(length) {
+  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+  let result = '';
+  const charactersLength = characters.length;
+  for (let i = 0; i < length; i++) {
+      result += characters.charAt(Math.floor(Math.random() * charactersLength));
+  }
+  return result;
+}
+
 
 
 // The following methods are a modified version derived from https://github.com/ali-raheem/Aify/blob/13ff87583bc520fb80f555ab90a90c5c9df797a7/plugin/content_scripts/compose.js