use tmpFiles list of parent call-session (#1301)

fixes #1299

lib/utils/place-outdial.js

@@ -401,7 +401,8 @@ class SingleDialer extends Emitter {
         accountInfo: this.accountInfo,
         tasks,
         rootSpan: this.rootSpan,
-        req: this.req
+        req: this.req,
+        tmpFiles: cs.tmpFiles,
       });
       await cs.exec();