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+
+# MSC_Tests.ttcn
+
+* external interfaces
+    * A: BSSAP/SCCP/M3UA (emulates BSC-side)
+    * MNCC: MNCC/unix-domain (emulates ext. MNCC side)
+    * MGW: MGCP (emulates MGW side)
+    * GSUP (impllements HLR side)
+
+{% dot msc_tests.svg
+digraph G {
+  rankdir=LR;
+  MSC [label="IUT\nosmo-msc",shape="box"];
+  ATS [label="ATS\nMSC_Tests.ttcn"];
+
+  ATS -> MSC [label="MNCC"];
+  ATS -> MSC [label="SMPP",style="dashed"];
+  ATS -> MSC [label="CTRL"];
+  ATS -> MSC [label="VTY"];
+  MSC -> ATS [label="GSUP"];
+  ATS -> STP [label="A BSSAP\nSCCP/M3UA"];
+  MSC -> STP [label="A BSSAP\nSCCP/M3UA"];
+}
+%}