diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 5e4ebbc..8dcff83 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -981,7 +981,7 @@
 	clnt.vc_IPA := IPA_Emulation_CT.create(clnt.id & "-IPA") alive;
 	clnt.ccm_pars := c_IPA_default_ccm_pars;
 	clnt.ccm_pars.name := "Osmocom TTCN-3 BTS Simulator";
-	clnt.ccm_pars.unit_id := int2str(1234 + idx.bts) & "/0/" & int2str(idx.trx);
+	clnt.ccm_pars.unit_id := enc_IpaUnitId({1234 + idx.bts, 0, idx.trx});
 	if (handler_mode) {
 		clnt.vc_RSL := RSL_Emulation_CT.create(clnt.id & "-RSL") alive;
 		connect(clnt.vc_RSL:CCHAN_PT, self:RSL_CCHAN[idx.bts]);
@@ -3946,7 +3946,7 @@
 	client.vc_IPA := IPA_Emulation_CT.create(client.id & "-IPA") alive;
 	client.ccm_pars := c_IPA_default_ccm_pars;
 	client.ccm_pars.name := "Osmocom TTCN-3 BTS Simulator";
-	client.ccm_pars.unit_id := "99/0/0"; /* value which is unknown at BTS */
+	client.ccm_pars.unit_id := enc_IpaUnitId({99, 0, 0}); /* value which is unknown at BTS */
 
 	f_ipa_ctrl_start_client(mp_bsc_ip, mp_bsc_ctrl_port);