{% dot sgsn_tests.svg digraph G { rankdir=LR; SGSN [label="IUT\nosmo-sgsn",shape="box"]; ATS [label="ATS\nSGSN_Tests.ttcn"]; STP [label="STP\nosmo-stp"];
ATS -> SGSN [label="Gb"]; SGSN-> ATS [label="Gp (GTP)"]; SGSN -> STP [label="Iu (IuPS)"]; ATS -> STP [label="Iu (IuPS)"]; SGSN -> ATS [label="GSUP"]; ATS -> SGSN [label="VTY"]; } %}