diff --git a/libs/freetdm/conf/tones.conf b/libs/freetdm/conf/tones.conf
index d0f27acd93..8046578c68 100644
--- a/libs/freetdm/conf/tones.conf
+++ b/libs/freetdm/conf/tones.conf
@@ -11,8 +11,15 @@ detect-busy => 480,620
 generate-attn => v=0;%(100,100,1400,2060,2450,2600)
 detect-attn => 1400,2060,2450,2600
 
+generate-callwaiting-sas => v=0;%(300,0,440)
+detect-callwaiting-sas => 440
+
+generate-callwaiting-cas => v=0;%(80,0,2750,2130)
+detect-callwaiting-cas => 2750,2130
+
 detect-fail1 => 913.8
 detect-fail2 => 1370.6
 detect-fail3 => 776.7
 
 
+