diff --git a/include/openbsc/gsm_04_11.h b/include/openbsc/gsm_04_11.h
new file mode 100644
index 0000000..70145f9
--- /dev/null
+++ b/include/openbsc/gsm_04_11.h
@@ -0,0 +1,34 @@
+#ifndef _GSM_04_11_H
+#define _GSM_04_11_H
+
+/* GSM TS 04.11  definitions */
+
+/* Chapter 8.1.2 (refers to GSM 04.07 Chapter 11.2.3.1.1 */
+#define GSM411_PDISC_SMS	0x09
+
+/* Chapter 8.1.3 */
+#define GSM411_MT_CP_DATA	0x01
+#define GSM411_MT_CP_ACK	0x04
+#define GSM411_MT_CP_ERROR	0x10
+
+/* Chapter 8.2.2 */
+#define GSM411_MT_RP_DATA_MO	0x00
+#define GSM411_MT_RP_DATA_MT	0x01
+#define GSM411_MT_RP_ACK_MO	0x02
+#define GSM411_MT_RP_ACK_MT	0x03
+#define GSM411_MT_RP_ERROR_MO	0x04
+#define GSM411_MT_RP_ERROR_MT	0x04
+#define GSM411_MT_RP_SMMA_MO	0x05
+
+/* Chapter 8.1.1 */
+struct gsm411_rp_data_hdr {
+  u_int8_t msg_type;
+	u_int8_t msg_ref;
+	u_int8_t data[0];
+} __attribute__ ((packed));
+
+struct msgb;
+
+int gsm0411_rcv_sms(struct msgb *msg);
+
+#endif