diff --git a/include/osmocom/msc/ran_msg_a.h b/include/osmocom/msc/ran_msg_a.h
new file mode 100644
index 0000000..3ba081d
--- /dev/null
+++ b/include/osmocom/msc/ran_msg_a.h
@@ -0,0 +1,45 @@
+/* Abstraction of BSSAP decoding into NAS events, to be handled by MSC-A or MSC-I, and encoding of BSSAP messages
+ * towards the RAN. */
+/*
+ * (C) 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ *
+ * Author: Neels Hofmeyr <neels@hofmeyr.de>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include <stdint.h>
+
+#include <osmocom/msc/ran_msg.h>
+#include <osmocom/msc/paging.h>
+
+struct msgb;
+struct sccp_ran_inst;
+struct msub;
+struct gsm_mncc_bearer_cap;
+
+int ran_a_decode_l2(struct ran_dec *ran_a, struct msgb *bssap);
+struct msgb *ran_a_encode(struct osmo_fsm_inst *caller_fi, const struct ran_msg *ran_enc_msg);
+
+enum reset_msg_type bssmap_is_reset_msg(const struct sccp_ran_inst *sri, const struct msgb *l2);
+struct msgb *bssmap_make_reset_msg(const struct sccp_ran_inst *sri, enum reset_msg_type type);
+struct msgb *bssmap_make_paging_msg(const struct sccp_ran_inst *sri, const struct gsm0808_cell_id *page_cell_id,
+				    const char *imsi, uint32_t tmsi, enum paging_cause cause);
+const char *bssmap_msg_name(const struct sccp_ran_inst *sri, const struct msgb *l2);
+
+enum mgcp_codecs ran_a_mgcp_codec_from_sc(const struct gsm0808_speech_codec *sc);
+int ran_a_bearer_cap_to_channel_type(struct gsm0808_channel_type *ct, const struct gsm_mncc_bearer_cap *bc);