msc: add and fix Iu mt call

Change-Id: I3ce29f3d9254656dc295674e8cec72a741b7764a
diff --git a/msc/MSC_Tests_Iu.ttcn b/msc/MSC_Tests_Iu.ttcn
index 628fbcd..987baf0 100644
--- a/msc/MSC_Tests_Iu.ttcn
+++ b/msc/MSC_Tests_Iu.ttcn
@@ -249,6 +249,13 @@
 	vc_conn.done;
 }
 
+testcase TC_iu_lu_and_mt_call() runs on MTC_CT {
+	var BSC_ConnHdlr vc_conn;
+	f_init(3);
+	vc_conn := f_start_handler(refers(f_tc_lu_and_mt_call), 1142, ran_idx := 2, ran_is_geran := false);
+	vc_conn.done;
+}
+
 testcase TC_iu_lu_and_mo_sms() runs on MTC_CT {
 	var BSC_ConnHdlr vc_conn;
 	f_init(3);
@@ -438,6 +445,8 @@
 	execute( TC_iu_mo_release_timeout() );
 	execute( TC_reset_two_1iu() );
 
+	execute( TC_iu_lu_and_mt_call() );
+
 	execute( TC_iu_lu_and_mo_sms() );
 	execute( TC_iu_lu_and_mt_sms() );
 	execute( TC_iu_lu_and_mt_sms_paging_and_nothing() );