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diff --git a/sip/README.md b/sip/README.md
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+* SIP_Tests.ttcn
+
+* external interfaces
+    * MNCC (emulates MSC side)
+    * SIP (emulates SIP switch)
+    * VTY
+
+{% dot sip_tests.svg
+digraph G {
+  rankdir=LR;
+  SIP [label="SIP\nosmo-sip-connector",shape="box"];
+  ATS [label="ATS\nSIP_Tests.ttcn"];
+
+  ATS -> SIP [label="MNCC"];
+  ATS -> SIP [label="SIP"];
+  ATS -> SIP [label="VTY"];
+}
+%}