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"]; } %}