codec_filter_set_ran: prepare for CSD

Related: OS#4394
Change-Id: I467a7bd461dcac2fff93a3777d4090d6b7d3d041
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};