diff --git a/include/osmocom/abis/ipaccess.h b/include/osmocom/abis/ipaccess.h
index 2792572..d4174a8 100644
--- a/include/osmocom/abis/ipaccess.h
+++ b/include/osmocom/abis/ipaccess.h
@@ -90,4 +90,14 @@
 	uint32_t start;
 } __attribute__((packed));
 
+struct ipaccess_unit {
+	uint16_t site_id;
+	uint16_t bts_id;
+	uint16_t trx_id;
+};
+
+struct hsl_unit {
+	unsigned long serno;
+};
+
 #endif /* _OSMO_PROTO_IPACCESS_H */