diff --git a/sysinfo/Test.ttcn b/sysinfo/Test.ttcn
index 4e3186f..c30ad6a 100644
--- a/sysinfo/Test.ttcn
+++ b/sysinfo/Test.ttcn
@@ -479,18 +479,14 @@
 		f_init();
 
 		/* Enable SI2bis + validate scheduling */
-		f_vty_enter_cfg_bts(BSCVTY, 0);
-		f_vty_si_static(BSCVTY, 0, "2bis", c_si2bis);
-		f_vty_si_resend(BSCVTY, 0);
-		f_vty_transceive(BSCVTY, "do write terminal");
 		si_cfg.si2bis_present := true;
+		f_si_cfg_to_vty();
 		si_per_tc := f_gsmtap_sample_si(GSMTAP);
 		f_validate_si_scheduling(si_cfg, si_per_tc);
 
 		/* cleanup */
-		f_vty_si_computed(BSCVTY, 0, "2bis");
-		f_vty_si_resend(BSCVTY, 0);
 		si_cfg.si2bis_present := false;
+		f_si_cfg_to_vty();
 
 		setverdict(pass);
 	}
@@ -500,18 +496,14 @@
 		f_init();
 
 		/* Enable SI2ter + validate scheduling */
-		f_vty_enter_cfg_bts(BSCVTY, 0);
-		f_vty_si_static(BSCVTY, 0, "2ter", c_si2ter);
-		f_vty_transceive(BSCVTY, "write terminal");
-		f_vty_si_resend(BSCVTY, 0);
 		si_cfg.si2ter_present := true;
+		f_si_cfg_to_vty();
 		si_per_tc := f_gsmtap_sample_si(GSMTAP);
 		f_validate_si_scheduling(si_cfg, si_per_tc);
 
 		/* cleanup */
-		f_vty_si_computed(BSCVTY, 0, "2ter");
-		f_vty_si_resend(BSCVTY, 0);
 		si_cfg.si2ter_present := false;
+		f_si_cfg_to_vty();
 
 		setverdict(pass);
 	}
@@ -521,22 +513,16 @@
 		f_init();
 
 		/* Enable SI2bis + SI2ter + validate scheduling */
-		f_vty_enter_cfg_bts(BSCVTY, 0);
-		f_vty_si_static(BSCVTY, 0, "2bis", c_si2bis);
-		f_vty_si_static(BSCVTY, 0, "2ter", c_si2ter);
-		f_vty_transceive(BSCVTY, "write terminal");
-		f_vty_si_resend(BSCVTY, 0);
 		si_cfg.si2bis_present := true;
 		si_cfg.si2ter_present := true;
+		f_si_cfg_to_vty();
 		si_per_tc := f_gsmtap_sample_si(GSMTAP);
 		f_validate_si_scheduling(si_cfg, si_per_tc);
 
 		/* cleanup */
-		f_vty_si_computed(BSCVTY, 0, "2bis");
-		f_vty_si_computed(BSCVTY, 0, "2ter");
-		f_vty_si_resend(BSCVTY, 0);
 		si_cfg.si2bis_present := false;
 		si_cfg.si2ter_present := false;
+		f_si_cfg_to_vty();
 
 		setverdict(pass);
 	}
@@ -546,17 +532,12 @@
 		f_init();
 
 		/* Enable SI2quater + validate scheduling */
-		f_vty_si2q_add_uarfcn(BSCVTY, 0, 23, 42);
-		f_vty_transceive(BSCVTY, "write terminal");
-		f_vty_si_resend(BSCVTY, 0);
 		si_cfg.si2quater_present := true;
-		si_per_tc := f_gsmtap_sample_si(GSMTAP);
-		f_validate_si_scheduling(si_cfg, si_per_tc);
+		f_si_cfg_to_vty();
 
 		/* cleanup */
-		f_vty_si2q_del_uarfcn(BSCVTY, 0, 23, 42);
-		f_vty_si_resend(BSCVTY, 0);
 		si_cfg.si2quater_present := false;
+		f_si_cfg_to_vty();
 
 		setverdict(pass);
 	}
@@ -566,22 +547,66 @@
 		f_init();
 
 		/* Enable SI2ter + validate scheduling */
-		f_vty_enter_cfg_bts(BSCVTY, 0);
-		f_vty_gprs_mode(BSCVTY, 0, "gprs");
-		f_vty_transceive(BSCVTY, "write terminal");
-		f_vty_si_resend(BSCVTY, 0);
 		si_cfg.si13_present := true;
+		f_si_cfg_to_vty();
 		si_per_tc := f_gsmtap_sample_si(GSMTAP);
 		f_validate_si_scheduling(si_cfg, si_per_tc);
 
 		/* cleanup */
-		f_vty_gprs_mode(BSCVTY, 0, "none");
-		f_vty_si_resend(BSCVTY, 0);
 		si_cfg.si13_present := false;
+		f_si_cfg_to_vty();
 
 		setverdict(pass);
 	}
 
+	testcase TC_si_sched_13_2bis_2ter_2quater() runs on dummy_CT {
+		var SystemInformationVectorPerTc si_per_tc;
+		f_init();
+
+		si_cfg.si2bis_present := true;
+		si_cfg.si2ter_present := true;
+		si_cfg.si2quater_present := true;
+		si_cfg.si13_present := true;
+		f_si_cfg_to_vty();
+		si_per_tc := f_gsmtap_sample_si(GSMTAP);
+		f_validate_si_scheduling(si_cfg, si_per_tc);
+
+		/* cleanup */
+		si_cfg.si2bis_present := false;
+		si_cfg.si2ter_present := false;
+		si_cfg.si2quater_present := false;
+		si_cfg.si13_present := false;
+		f_si_cfg_to_vty();
+
+		setverdict(pass);
+	}
+
+	function f_si_cfg_to_vty() runs on dummy_CT {
+		if (si_cfg.si2bis_present) {
+			f_vty_si_static(BSCVTY, 0, "2bis", c_si2bis);
+		} else {
+			f_vty_si_computed(BSCVTY, 0, "2bis");
+		}
+		if (si_cfg.si2ter_present) {
+			f_vty_si_static(BSCVTY, 0, "2ter", c_si2ter);
+		} else {
+			f_vty_si_computed(BSCVTY, 0, "2ter");
+		}
+		if (si_cfg.si13_present) {
+			f_vty_gprs_mode(BSCVTY, 0, "gprs");
+		} else {
+			f_vty_gprs_mode(BSCVTY, 0, "none");
+		}
+		if (si_cfg.si2quater_present) {
+			f_vty_si2q_add_uarfcn(BSCVTY, 0, 23, 42);
+		} else {
+			f_vty_si2q_del_uarfcn(BSCVTY, 0, 23, 42);
+		}
+		/* for debugging */
+		f_vty_transceive(BSCVTY, "write terminal");
+		/* actually commit the changes from BSC -> BTS */
+		f_vty_si_resend(BSCVTY, 0);
+	}
 
 	/* permitted prompts on VTY */
 	const charstring NORMAL_PROMPT := "OpenBSC> ";
@@ -735,5 +760,6 @@
 		execute(TC_si_sched_2ter_2bis());
 		execute(TC_si_sched_2quater());
 		execute(TC_si_sched_13());
+		execute(TC_si_sched_13_2bis_2ter_2quater());
 	}
 }