diff --git a/bsc-nat/BSCNAT_Tests.ttcn b/bsc-nat/BSCNAT_Tests.ttcn
index b6dca28..685066c 100644
--- a/bsc-nat/BSCNAT_Tests.ttcn
+++ b/bsc-nat/BSCNAT_Tests.ttcn
@@ -112,6 +112,8 @@
 		msc[i].MSC.start(MSC_Simulation.main(mp_msc_ip, mp_msc_port + i, msc[i].sccp_pars, msc[i].sccp_addr_own, id));
 	}
 
+	/* Wait for bsc_nat to attach to MSC. Before that all BSC connections will be dropped */
+	f_sleep(5.0);
 	for (i := 0; i < NUM_BSC; i := i+1) {
 		f_init_BscState(bsc[i], mp_bsc_pc +i, mp_msc_pc, mp_bsc_ssn, mp_msc_ssn);
 		bsc[i].BSC := BSC_CT.create;