Let users ring members when starting a group call

Co-Authored-By: Josh Perez <60019601+josh-signal@users.noreply.github.com>

ts/util/isGroupCallOutboundRingEnabled.ts

@@ -0,0 +1,11 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import * as RemoteConfig from '../RemoteConfig';
+
+export function isGroupCallOutboundRingEnabled(): boolean {
+  return Boolean(
+    RemoteConfig.isEnabled('desktop.internalUser') ||
+      RemoteConfig.isEnabled('desktop.groupCallOutboundRing')
+  );
+}