diff --git a/bsc/MSC_ConnectionHandler.ttcn b/bsc/MSC_ConnectionHandler.ttcn
index a4f1f51..8e915ac 100644
--- a/bsc/MSC_ConnectionHandler.ttcn
+++ b/bsc/MSC_ConnectionHandler.ttcn
@@ -544,12 +544,14 @@
 
 type record TestHdlrEncrParams {
 	OCT1		enc_alg,
-	octetstring	enc_key
+	octetstring	enc_key,
+	octetstring	enc_kc128 optional
 };
 
-template (value) TestHdlrEncrParams t_EncrParams(OCT1 alg, octetstring key) := {
+template (value) TestHdlrEncrParams t_EncrParams(OCT1 alg, octetstring key, template (omit) octetstring kc128 := omit) := {
 	enc_alg := alg,
-	enc_key := key
+	enc_key := key,
+	enc_kc128 := kc128
 }
 
 type record TestHdlrParamsLcls {
@@ -711,25 +713,25 @@
 	}
 }
 
-function f_cipher_mode(OCT1 alg, OCT8 key, template OCT16 kc128 := omit, boolean exp_fail := false)
+function f_cipher_mode(TestHdlrEncrParams enc, boolean exp_fail := false)
 runs on MSC_ConnHdlr {
 	var PDU_BSSAP bssap;
 	var RSL_Message rsl;
 	var RSL_AlgId alg_rsl;
 
-	if (isvalue(kc128)) {
-		BSSAP.send(ts_BSSMAP_CipherModeCmdKc128(alg, key, valueof(kc128)));
+	if (isvalue(enc.enc_kc128)) {
+		BSSAP.send(ts_BSSMAP_CipherModeCmdKc128(enc.enc_alg, enc.enc_key, valueof(enc.enc_kc128)));
 	} else {
-		BSSAP.send(ts_BSSMAP_CipherModeCmd(alg, key));
+		BSSAP.send(ts_BSSMAP_CipherModeCmd(enc.enc_alg, enc.enc_key));
 	}
 
 	/* RSL uses a different representation of the encryption algorithm,
 	 * so we need to convert first */
-	alg_rsl := f_chipher_mode_bssmap_to_rsl(alg);
+	alg_rsl := f_chipher_mode_bssmap_to_rsl(enc.enc_alg);
 
 	alt {
 	/* RSL/UE Side */
-	[] RSL.receive(tr_RSL_ENCR_CMD(g_chan_nr, ?, alg_rsl, key)) -> value rsl {
+	[] RSL.receive(tr_RSL_ENCR_CMD(g_chan_nr, ?, alg_rsl, enc.enc_key)) -> value rsl {
 		var PDU_ML3_NW_MS l3 := dec_PDU_ML3_NW_MS(rsl.ies[3].body.l3_info.payload);
 		log("Rx L3 from net: ", l3);
 		if (ischosen(l3.msgs.rrm.cipheringModeCommand)) {
@@ -1147,7 +1149,7 @@
 
 	/* start ciphering, if requested */
 	if (ispresent(g_pars.encr)) {
-		f_cipher_mode(g_pars.encr.enc_alg, g_pars.encr.enc_key);
+		f_cipher_mode(g_pars.encr);
 	}
 
 	/* bail out early if no assignment requested */