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-rw-r--r--docs/qos.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/qos.rst b/docs/qos.rst
index 05e66ba4..f1e5f37f 100644
--- a/docs/qos.rst
+++ b/docs/qos.rst
@@ -1083,6 +1083,12 @@ parameters.
+.. note:: If you configure a class for **VoIP traffic**, don't give it any
+ *ceiling*, otherwise new VoIP calls could start when there is available
+ bandwidth and get suddenly dropped when other classes start using
+ their bandwidth.
+
+
Example
^^^^^^^