diff --git a/include/s1ap/s1ap_msg_codes.h b/include/s1ap/s1ap_msg_codes.h
new file mode 100644
index 0000000..67ca2c9
--- /dev/null
+++ b/include/s1ap/s1ap_msg_codes.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2003-2018, Great Software Laboratory Pvt. Ltd.
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __S1AP_MSG_CODES_H_
+#define __S1AP_MSG_CODES_H_
+
+/****S1AP Procedude codes****/
+#define S1AP_SETUP_REQUEST_CODE 17
+#define S1AP_INITIAL_UE_MSG_CODE 12
+#define S1AP_UE_CONTEXT_RELEASE_REQUEST_CODE 18
+#define S1AP_UE_CONTEXT_RELEASE_CODE 23
+/*uplink NAS Transport*/
+#define S1AP_UL_NAS_TX_MSG_CODE 13
+#define S1AP_INITIAL_CTX_RESP_CODE 9
+
+/*S1AP Protocol IE types*/
+#define S1AP_IE_GLOBAL_ENB_ID 59
+#define S1AP_IE_ENB_NAME 60
+#define S1AP_IE_SUPPORTED_TAS 64
+#define S1AP_IE_DEF_PAGING_DRX 137
+#define S1AP_IE_MMENAME 61
+#define S1AP_IE_SERVED_GUMMEIES 105
+#define S1AP_IE_REL_MME_CAPACITY 87
+
+#define S1AP_IE_MME_UE_ID 0
+#define S1AP_IE_CAUSE 2
+#define S1AP_IE_ENB_UE_ID 8
+#define S1AP_IE_NAS_PDU  26
+#define S1AP_IE_TAI  67
+#define S1AP_IE_UTRAN_CGI  100
+#define S1AP_IE_S_TMSI  96
+#define S1AP_IE_RRC_EST_CAUSE  134
+#define S1AP_ERAB_SETUP_CTX_SUR 51
+
+/*NAS message type codes*/
+#define NAS_ESM_RESP 0xda
+#define NAS_AUTH_RESP 0x53
+#define NAS_AUTH_REJECT 0x54
+#define NAS_AUTH_FAILURE 0x5c
+#define NAS_IDENTITY_REQUEST 0x55
+#define NAS_IDENTITY_RESPONSE 0x56
+#define NAS_SEC_MODE_COMPLETE 0x5e
+#define NAS_SEC_MODE_REJECT  0x5f
+#define NAS_ATTACH_REQUEST 0x41
+#define NAS_ATTACH_COMPLETE 0x43
+#define NAS_ATTACH_REJECT 0x44
+#define NAS_TAU_REQUEST    0x48
+#define NAS_TAU_COMPLETE   0x4
+#define NAS_DETACH_REQUEST 0x45
+#define NAS_DETACH_ACCEPT 0x46
+#define NAS_SERVICE_REQUEST 0x4D
+
+#endif /*__S1AP_MSG_CODES*/