diff --git a/include/osmocore/rsl.h b/include/osmocore/rsl.h
new file mode 100644
index 0000000..3a2b04d
--- /dev/null
+++ b/include/osmocore/rsl.h
@@ -0,0 +1,24 @@
+#ifndef _OSMOCORE_RSL_H
+#define _OSMOCORE_RSL_H
+
+#include <stdint.h>
+#include <osmocore/utils.h>
+#include <osmocore/protocol/gsm_08_58.h>
+
+void rsl_init_rll_hdr(struct abis_rsl_rll_hdr *dh, uint8_t msg_type);
+
+extern const struct tlv_definition rsl_att_tlvdef;
+#define rsl_tlv_parse(dec, buf, len)     \
+			tlv_parse(dec, &rsl_att_tlvdef, buf, len, 0, 0)
+
+/* encode channel number as per Section 9.3.1 */
+uint8_t rsl_enc_chan_nr(uint8_t type, uint8_t subch, uint8_t timeslot);
+
+const struct value_string rsl_rlm_cause_strs[];
+
+const char *rsl_err_name(uint8_t err);
+
+/* Section 3.3.2.3 TS 05.02. I think this looks like a table */
+int rsl_ccch_conf_to_bs_cc_chans(int ccch_conf);
+
+#endif /* _OSMOCORE_RSL_H */