diff --git a/ui/src/app/telephony-configurations/[configId]/page.tsx b/ui/src/app/telephony-configurations/[configId]/page.tsx
index 565b5f4..e1aa6dc 100644
--- a/ui/src/app/telephony-configurations/[configId]/page.tsx
+++ b/ui/src/app/telephony-configurations/[configId]/page.tsx
@@ -57,6 +57,15 @@ import {
 } from "@/components/ui/table";
 import { useAuth } from "@/lib/auth";
 
+const INBOUND_WEBHOOK_PATH = "/api/v1/telephony/inbound/run";
+
+function getInboundWebhookUrl(): string {
+  const backendUrl =
+    process.env.NEXT_PUBLIC_BACKEND_URL ||
+    (typeof window !== "undefined" ? window.location.origin : "");
+  return `${backendUrl}${INBOUND_WEBHOOK_PATH}`;
+}
+
 export default function TelephonyConfigurationDetailPage() {
   const router = useRouter();
   const params = useParams<{ configId: string }>();
@@ -255,16 +264,17 @@ export default function TelephonyConfigurationDetailPage() {
             <button
               type="button"
               onClick={() => {
-                const url = `${typeof window !== "undefined" ? window.location.origin : ""}/api/v1/telephony/inbound/run`;
+                const url = getInboundWebhookUrl();
                 navigator.clipboard
                   .writeText(url)
                   .then(() => toast.success("Inbound webhook URL copied"))
                   .catch(() => toast.error("Failed to copy URL"));
               }}
               title="Click to copy inbound webhook URL"
+              aria-label="Copy inbound webhook URL"
               className="inline-flex items-center gap-1 self-start rounded font-mono text-xs text-muted-foreground hover:text-foreground"
             >
-              <span className="truncate">/api/v1/telephony/inbound/run</span>
+              <span className="truncate">{getInboundWebhookUrl()}</span>
               <Copy className="h-3 w-3 shrink-0" />
             </button>
           </div>