diff --git a/openbsc/include/openbsc/bsc_nat.h b/openbsc/include/openbsc/bsc_nat.h
index 280fa50..423f009 100644
--- a/openbsc/include/openbsc/bsc_nat.h
+++ b/openbsc/include/openbsc/bsc_nat.h
@@ -38,6 +38,7 @@
 #define DIR_BSC 1
 #define DIR_MSC 2
 
+struct sccp_source_reference;
 struct sccp_connections;
 struct bsc_nat_parsed;
 struct bsc_nat;
@@ -276,6 +277,7 @@
 void remove_sccp_src_ref(struct bsc_connection *bsc, struct msgb *msg, struct bsc_nat_parsed *parsed);
 struct sccp_connections *patch_sccp_src_ref_to_bsc(struct msgb *, struct bsc_nat_parsed *, struct bsc_nat *);
 struct sccp_connections *patch_sccp_src_ref_to_msc(struct msgb *, struct bsc_nat_parsed *, struct bsc_connection *);
+struct sccp_connections *bsc_nat_find_con_by_bsc(struct bsc_nat *, struct sccp_source_reference *);
 
 /**
  * MGCP/Audio handling
diff --git a/openbsc/src/nat/bsc_sccp.c b/openbsc/src/nat/bsc_sccp.c
index dae5950..a5c4f1b 100644
--- a/openbsc/src/nat/bsc_sccp.c
+++ b/openbsc/src/nat/bsc_sccp.c
@@ -235,3 +235,16 @@
 
 	return NULL;
 }
+
+struct sccp_connections *bsc_nat_find_con_by_bsc(struct bsc_nat *nat,
+						 struct sccp_source_reference *ref)
+{
+	struct sccp_connections *conn;
+
+	llist_for_each_entry(conn, &nat->sccp_connections, list_entry) {
+		if (memcmp(ref, &conn->real_ref, sizeof(*ref)) == 0)
+			return conn;
+	}
+
+	return NULL;
+}