diff --git a/htdocs/asterisk/wrapper.php b/htdocs/asterisk/wrapper.php
index 25cfdd9b56d..6f634444498 100644
--- a/htdocs/asterisk/wrapper.php
+++ b/htdocs/asterisk/wrapper.php
@@ -145,7 +145,7 @@ if (! empty($number))
 	endif ;
 }
 else {
-    print 'Bad parameters in URL. Must be http://MYDOLIBARR/asterisk/wrapper.php?caller=99999&called=99999&login=xxxxx&password=xxxxx';
+    print 'Bad parameters in URL. Must be '.$_SERVER['PHP_SELF'].'?caller=99999&called=99999&login=xxxxx&password=xxxxx';
 }
 
 print '</html>'."\n";