From 64798a99de41c6f4a3ce24379afe124d323ace5b Mon Sep 17 00:00:00 2001
From: James Finstrom <jfinstrom@sangoma.com>
Date: Mon, 2 May 2016 14:27:00 -0700
Subject: [PATCH] FREEPBX-12210 Check that variable is set

---
 sources/source-Herold_Austria.module | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sources/source-Herold_Austria.module b/sources/source-Herold_Austria.module
index 1acc4d80..02bbad91 100644
--- a/sources/source-Herold_Austria.module
+++ b/sources/source-Herold_Austria.module
@@ -51,6 +51,7 @@ class Herold_Austria extends superfecta_base {
                 if (!$caller_id && $this->SearchURL($bus_url, $regexp, $match)) {
                         $caller_id = $this->ExtractMatch($match);
                 }
+								$caller_id = isset($caller_id)?$caller_id:'';
                 return($caller_id);
         }
 }