"SIP_Tests.ttcn:228 : unexpected SDP" SIP_Tests.ttcn:775 SIP_Tests control part SIP_Tests.ttcn:754 TC_mt_with_sdp testcase SIP Response for unknown call "DD7F8F51EBA6F21" SIP_Tests.ttcn:776 SIP_Tests control part SIP_Tests.ttcn:764 TC_mo_with_sdp testcase