diff --git a/kamailio/default.cfg b/kamailio/default.cfg
index e05cf4f..ec18f8f 100644
--- a/kamailio/default.cfg
+++ b/kamailio/default.cfg
@@ -255,6 +255,8 @@ modparam("permissions", "db_mode", 1)
 route
 {
     route(SANITY_CHECK);
+    
+    route(CHECK_RETRANS);
 
     # log the basic info regarding this call
     xlog("L_INFO", "$ci|start|received $pr request $rm $ou");
@@ -327,6 +329,15 @@ route
     route(EXTERNAL_TO_INTERNAL_RELAY);
 }
 
+route[CHECK_RETRANS]
+{
+  # handle retransmissions
+    if(t_precheck_trans()) {
+        t_check_trans();
+        exit;
+    }
+}
+
 route[SANITY_CHECK]
 {
     if (!sanity_check()) {