diff --git a/kamailio/dispatcher-role.cfg b/kamailio/dispatcher-role.cfg
index 24b26cc..cec4326 100644
--- a/kamailio/dispatcher-role.cfg
+++ b/kamailio/dispatcher-role.cfg
@@ -35,7 +35,7 @@ modparam("dispatcher", "ds_ping_from", "sip:sipcheck@MY_HOSTNAME")
 route[DISPATCHER_CLASSIFY_SOURCE]
 {
     #!import_file "dispatcher-network-classify.cfg"
-    
+
     if (is_myself("$ou")) {
         xlog("L_INFO", "$ci|log|original R-URI ($ou) is this proxy, treating as external sources\n");
     } else if (
@@ -64,7 +64,7 @@ route[DISPATCHER_FIND_ROUTES]
 
     $var(ds_primary_group) = 1;
     $var(ds_backup_group) = 2;
-    
+
     #!ifndef PRESENCE_ROLE
     if (is_method("SUBSCRIBE")) {
         $var(ds_primary_group) = 10;
@@ -91,7 +91,7 @@ route[DISPATCHER_FIND_ROUTES]
         # we selected from primary group, try again in backup group
         if (!ds_select_dst("$var(ds_backup_group)", "0") || $(avp(ds_dst)[0]) == $null) {
              xlog("L_WARN", "$ci|end|no servers available in primary or backup group\n");
-             sl_send_reply("480", "All servers busy");
+             drop();
              exit;
         } else {
             $var(ds_group) = $var(ds_backup_group);
diff --git a/kamailio/registrar-role.cfg b/kamailio/registrar-role.cfg
index 3474fd0..8052791 100644
--- a/kamailio/registrar-role.cfg
+++ b/kamailio/registrar-role.cfg
@@ -172,9 +172,8 @@ route[KAZOO_AUTHORIZATION]
         exit();
     }
     if(kazoo_async_query("callmgr", $var(amqp_routing_key), $var(amqp_payload_request), "KAZOO_AUTHORIZATION_OK", "KAZOO_AUTHORIZATION_ERROR") != 1) {
-        xlog("L_INFO", "$ci|log|failed to send Kazoo query for authentication credentials for $Au $si:$sp\n");
-        append_to_reply("Retry-After: 60\r\n");
-        send_reply("503", "Retry Later");
+        xlog("L_INFO", "$ci|log|failed to send Kazoo query for authentication credentials for $Au $si:$sp - dropping request\n");
+        drop();
         exit;
     }
 }
@@ -203,9 +202,8 @@ route[KAZOO_AUTHORIZATION_OK]
 
 route[KAZOO_AUTHORIZATION_ERROR]
 {
-    xlog("L_INFO", "$ci|log|failed to query Kazoo for authentication credentials for $Au $si:$sp\n");
-    append_to_reply("Retry-After: 60\r\n");
-    send_reply("503", "Retry Later");
+    xlog("L_INFO", "$ci|log|failed to query Kazoo for authentication credentials for $Au $si:$sp - dropping request\n");
+    drop();
     exit;
 }