codec_filter_init: prepare for CSD

Related: OS#4394
Change-Id: I1270b00464456abc5300fd47e6087a0ba6243d03
diff --git a/include/osmocom/msc/transaction_cc.h b/include/osmocom/msc/transaction_cc.h
index df0f9d8..c2550f6 100644
--- a/include/osmocom/msc/transaction_cc.h
+++ b/include/osmocom/msc/transaction_cc.h
@@ -30,4 +30,5 @@
 #include <osmocom/msc/transaction.h>
 #include <osmocom/msc/vlr.h>
 
+void trans_cc_filter_init(struct gsm_trans *trans);
 void trans_cc_filter_set_ms_from_bc(struct gsm_trans *trans, const struct gsm_mncc_bearer_cap *bcap);