diff --git a/sgsn/SGSN_Tests_Iu.ttcn b/sgsn/SGSN_Tests_Iu.ttcn
index 2b63b4e..236a6a7 100644
--- a/sgsn/SGSN_Tests_Iu.ttcn
+++ b/sgsn/SGSN_Tests_Iu.ttcn
@@ -1,6 +1,7 @@
 module SGSN_Tests_Iu {
 
 import from Osmocom_Types all;
+import from Osmocom_VTY_Functions all;
 
 import from SGSN_Tests all;
 
@@ -36,6 +37,29 @@
 	f_cleanup();
 }
 
+testcase TC_iu_attach_encr() runs on test_CT {
+	/* MS -> SGSN: Attach Request IMSI
+	 * MS <- SGSN: Identity Request IMEI
+	 * MS -> SGSN: Identity Response IMEI
+	 * MS <- SGSN: Auth Request
+	 * MS -> SGSN: Auth Response
+	 * MS <- SGSN: Security Mode Command
+	 * MS -> SGSN: Security Mode Complete
+	 * hNodeB <- SGSN: Common Id
+	 * MS <- SGSN: Attach Accept
+	 * MS -> SGSN: Attach Complete
+	 */
+	var BSSGP_ConnHdlr vc_conn;
+	g_ranap_enable := true;
+	f_init();
+	f_vty_config(SGSNVTY, "sgsn", "encryption uea 1 2");
+	f_sleep(1.0);
+	vc_conn := f_start_handler(refers(f_TC_iu_attach), testcasename(), g_gb, 1001, expect_ciph := true);
+	vc_conn.done;
+	f_vty_config(SGSNVTY, "sgsn", "encryption uea 0");
+	f_cleanup();
+}
+
 private function f_TC_iu_attach_geran_rau(charstring id) runs on BSSGP_ConnHdlr {
 	var PdpActPars apars := valueof(t_PdpActPars(mp_ggsn_ip));
 
@@ -85,6 +109,7 @@
 
 control {
 	execute( TC_iu_attach() );
+	execute( TC_iu_attach_encr() );
 	execute( TC_iu_attach_geran_rau() );
 	execute( TC_geran_attach_iu_rau() );
 }