diff --git a/doc/examples/osmo-sgsn/osmo-sgsn-accept-all.cfg b/doc/examples/osmo-sgsn/osmo-sgsn-accept-all.cfg
index 5e64342..b47878a 100644
--- a/doc/examples/osmo-sgsn/osmo-sgsn-accept-all.cfg
+++ b/doc/examples/osmo-sgsn/osmo-sgsn-accept-all.cfg
@@ -9,6 +9,7 @@
  gtp local-ip 127.0.0.1
  ggsn 0 remote-ip 127.0.0.2
  ggsn 0 gtp-version 1
+ ggsn 0 echo-interval 60
  auth-policy accept-all
 !
 ns
diff --git a/doc/examples/osmo-sgsn/osmo-sgsn.cfg b/doc/examples/osmo-sgsn/osmo-sgsn.cfg
index 06f035f..263bd00 100644
--- a/doc/examples/osmo-sgsn/osmo-sgsn.cfg
+++ b/doc/examples/osmo-sgsn/osmo-sgsn.cfg
@@ -9,6 +9,7 @@
  gtp local-ip 127.0.0.1
  ggsn 0 remote-ip 127.0.0.2
  ggsn 0 gtp-version 1
+ ggsn 0 echo-interval 60
  auth-policy remote
  gsup remote-ip 127.0.0.1
  gsup remote-port 4222