diff --git a/kamailio/defs.cfg b/kamailio/defs.cfg
index bef416b..b7baf73 100644
--- a/kamailio/defs.cfg
+++ b/kamailio/defs.cfg
@@ -7,8 +7,8 @@
 
 #!substdef "!MAJOR!$(version(num){re.subst,/^(([^\.])*\.([^\.])*)\..*/\1/})!g"
 
-#!trydef EXTERNAL_TO_INTERNAL_NO_RESPONSE_TIMER 250
-#!trydef INTERNAL_TO_EXTERNAL_NO_RESPONSE_TIMER 500
+#!trydef EXTERNAL_TO_INTERNAL_NO_RESPONSE_TIMER 3500
+#!trydef INTERNAL_TO_EXTERNAL_NO_RESPONSE_TIMER 3500
 
 kazoo.to_internal_no_response_timer = EXTERNAL_TO_INTERNAL_NO_RESPONSE_TIMER descr "external to internal no response timer"
 kazoo.to_external_no_response_timer = INTERNAL_TO_EXTERNAL_NO_RESPONSE_TIMER descr "internal to external no response timer"