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+* Asterisk_Tests.ttcn
+
+* external interfaces
+    * SIP (emulates SIP UAs)
+    * VoLTE (emulates IMS server)
+
+{% dot sip_tests.svg
+digraph G {
+  rankdir=LR;
+  Asterisk [label="IUT\nAsterisk",shape="box"];
+  ATS [label="ATS\nAsterisk_Tests.ttcn"];
+
+  ATS -> Asterisk [label="SIP"];
+  ATS -> Asterisk [label="VoLTE (IMS)"];
+}
+%}