diff --git a/src/libmsc/gsm_04_08_cc.c b/src/libmsc/gsm_04_08_cc.c
index fff7c3f..868dd66 100644
--- a/src/libmsc/gsm_04_08_cc.c
+++ b/src/libmsc/gsm_04_08_cc.c
@@ -672,7 +672,7 @@
 
 	/* MO call leg starting, gather all codec information so far known: */
 	trans_cc_filter_init(trans);
-	codec_filter_set_ran(&trans->cc.codecs, trans->msc_a->c.ran->type);
+	trans_cc_filter_set_ran(trans, trans->msc_a->c.ran->type);
 	codec_filter_set_bss(&trans->cc.codecs, &trans->msc_a->cc.compl_l3_codec_list_bss_supported);
 	if (setup.fields & MNCC_F_BEARER_CAP)
 		trans_cc_filter_set_ms_from_bc(trans, &trans->bearer_cap);
@@ -805,7 +805,7 @@
 	 * We haven't received the MT MS's Bearer Capabilities yet; the Bearer Capabilities handled here are
 	 * actually the remote call leg's Bearer Capabilities. */
 	trans_cc_filter_init(trans);
-	codec_filter_set_ran(&trans->cc.codecs, trans->msc_a->c.ran->type);
+	trans_cc_filter_set_ran(trans, trans->msc_a->c.ran->type);
 	codec_filter_set_bss(&trans->cc.codecs, &trans->msc_a->cc.compl_l3_codec_list_bss_supported);
 	/* sdp.remote: if SDP is included in the MNCC, take that as definitive list of remote audio codecs. */
 	rx_mncc_sdp(trans, setup->msg_type, setup->sdp);
diff --git a/src/libmsc/transaction_cc.c b/src/libmsc/transaction_cc.c
index 4946d3f..8059bb4 100644
--- a/src/libmsc/transaction_cc.c
+++ b/src/libmsc/transaction_cc.c
@@ -23,12 +23,18 @@
  */
 
 #include <osmocom/msc/transaction_cc.h>
+#include <osmocom/msc/codec_filter.h>
 
 void trans_cc_filter_init(struct gsm_trans *trans)
 {
 	trans->cc.codecs = (struct codec_filter){};
 }
 
+void trans_cc_filter_set_ran(struct gsm_trans *trans, enum osmo_rat_type ran_type)
+{
+	codec_filter_set_ran(&trans->cc.codecs, ran_type);
+}
+
 void trans_cc_filter_set_ms_from_bc(struct gsm_trans *trans, const struct gsm_mncc_bearer_cap *bcap)
 {
 	trans->cc.codecs.ms = (struct sdp_audio_codecs){0};