diff --git a/src/libmsc/codec_filter.c b/src/libmsc/codec_filter.c
index e93ebaf..99ae7b2 100644
--- a/src/libmsc/codec_filter.c
+++ b/src/libmsc/codec_filter.c
@@ -60,11 +60,6 @@
 		sdp_audio_codecs_add_speech_ver(ac, utran_codecs[i]);
 }
 
-void codec_filter_init(struct codec_filter *codec_filter)
-{
-	*codec_filter = (struct codec_filter){};
-}
-
 void codec_filter_set_ran(struct codec_filter *codec_filter, enum osmo_rat_type ran_type)
 {
 	codec_filter->ran = (struct sdp_audio_codecs){};
diff --git a/src/libmsc/gsm_04_08_cc.c b/src/libmsc/gsm_04_08_cc.c
index 773ee3d..fff7c3f 100644
--- a/src/libmsc/gsm_04_08_cc.c
+++ b/src/libmsc/gsm_04_08_cc.c
@@ -671,7 +671,7 @@
 	}
 
 	/* MO call leg starting, gather all codec information so far known: */
-	codec_filter_init(&trans->cc.codecs);
+	trans_cc_filter_init(trans);
 	codec_filter_set_ran(&trans->cc.codecs, 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)
@@ -804,7 +804,7 @@
 	 * Initialize the codecs filter with this side's BSS' codec list, received at Complete Layer 3.
 	 * 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. */
-	codec_filter_init(&trans->cc.codecs);
+	trans_cc_filter_init(trans);
 	codec_filter_set_ran(&trans->cc.codecs, 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. */
diff --git a/src/libmsc/transaction_cc.c b/src/libmsc/transaction_cc.c
index 3a0db2c..4946d3f 100644
--- a/src/libmsc/transaction_cc.c
+++ b/src/libmsc/transaction_cc.c
@@ -24,6 +24,11 @@
 
 #include <osmocom/msc/transaction_cc.h>
 
+void trans_cc_filter_init(struct gsm_trans *trans)
+{
+	trans->cc.codecs = (struct codec_filter){};
+}
+
 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};