diff --git a/filters/coturn.preg b/filters/coturn.preg
new file mode 100644
index 0000000..54c9ef7
--- /dev/null
+++ b/filters/coturn.preg
@@ -0,0 +1,2 @@
+# set: defscore=5
+closed \(2nd stage\), user <> .* remote <HOST>:[0-9]+, reason: allocation watchdog determined stale session state