diff --git a/libs/openzap/conf/tones.conf b/libs/openzap/conf/tones.conf
index 8046578c68..db6658d78e 100644
--- a/libs/openzap/conf/tones.conf
+++ b/libs/openzap/conf/tones.conf
@@ -19,7 +19,7 @@ detect-callwaiting-cas => 2750,2130
 
 detect-fail1 => 913.8
 detect-fail2 => 1370.6
-detect-fail3 => 776.7
+detect-fail3 => 1776.7