--- isdn4k-utils-CVS-2010-05-01-patched/isdnctrl/isdnctrl.c.than	2016-05-02 17:47:37.658481797 +0200
+++ isdn4k-utils-CVS-2010-05-01-patched/isdnctrl/isdnctrl.c	2016-05-02 17:52:19.621817619 +0200
@@ -1702,6 +1702,10 @@
 		usage();
 		exit(-1);
 	}
+   if ((argc == 2) && (!strcmp(argv[1], "-h"))) {
+      usage();
+      exit(0);
+   }
 	if ((argc == 2) && (!strcmp(argv[1], "-V"))) {
 		check_version(1);
 		exit(0);