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+# HLR_Tests.ttcn
+
+* external interfaces
+    * GSUP (emulates VLR/SGSN side)
+    * VTY
+
+{% dot hlr_tests.svg
+digraph G {
+  rankdir=LR;
+  HLR [label="IUT\nosmo-hlr",shape="box"];
+  ATS [label="ATS\nHLR_Tests.ttcn"];
+
+  ATS -> HLR [label="GSUP"];
+  ATS -> HLR [label="VTY"];
+}
+%}