diff --git a/cbc/CBS_Message.ttcn b/cbc/CBS_Message.ttcn
new file mode 100644
index 0000000..6f77a1b
--- /dev/null
+++ b/cbc/CBS_Message.ttcn
@@ -0,0 +1,38 @@
+/* ECBE (REST) interface client of osmo-cbc test suite in TTCN-3
+ * (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+module CBS_Message {
+
+import from Osmocom_Types all;
+
+import from BSSAP_Types all;
+import from BSSMAP_Templates all;
+
+import from CBSP_Types all;
+
+type record CBS_Message {
+	uint16_t msg_id,
+	uint16_t ser_nr,
+	uint16_t old_ser_nr optional,
+	BSSMAP_FIELD_CellIdentificationList cell_list,
+	uint8_t channel_ind,
+	CBSP_Category category,
+	uint16_t rep_period,
+	uint16_t num_bcast_req,
+	uint8_t dcs,
+	CBS_MessageContents content
+};
+type record CBS_MessageContent {
+	octetstring payload,
+	uint8_t user_len
+};
+type record of CBS_MessageContent CBS_MessageContents;
+
+}