diff --git a/src/s1ap/handlers/attach_initue.c b/src/s1ap/handlers/attach_initue.c
new file mode 100644
index 0000000..f62394f
--- /dev/null
+++ b/src/s1ap/handlers/attach_initue.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2003-2018, Great Software Laboratory Pvt. Ltd.
+ * Copyright (c) 2017 Intel Corporation
+ * Copyright (c) 2019, Infosys Ltd.
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <pthread.h>
+
+#include "err_codes.h"
+#include "options.h"
+#include "ipc_api.h"
+#include "main.h"
+#include "s1ap.h"
+#include "s1ap_config.h"
+#include "sctp_conn.h"
+#include "s1ap_structs.h"
+#include "s1ap_msg_codes.h"
+#include "msgType.h"
+
+extern int g_enb_fd;
+extern ipc_handle ipc_S1ap_Hndl;
+extern struct time_stat g_attach_stats[];
+
+int
+s1_init_ue_handler(struct proto_IE *s1_init_ies, int enodeb_fd)
+{
+	struct s1_incoming_msg_data_t ue_info = {0};
+    	int nas_index = 0;
+
+	/*****Message structure***
+	*/
+	log_msg(LOG_INFO, "Parse s1ap initial UE message\n");
+
+	/*Validate all eNB info*/
+
+	/*Add eNB info to hash*/
+	//STIMER_GET_CURRENT_TP(g_attach_stats[s1_init_ies->data[0].enb_ue_s1ap_id].init_ue);
+
+	/*Create Q structure for stage 1 to MME.
+	  contains init UE information.*/
+	ue_info.msg_type = attach_request;
+			
+	ue_info.msg_data.ue_attach_info_m.enb_fd = enodeb_fd;
+	ue_info.msg_data.ue_attach_info_m.criticality = s1_init_ies->criticality;//TBD
+    for(int i = 0; i < s1_init_ies->no_of_IEs; i++)
+    {
+        switch(s1_init_ies->data[i].IE_type)
+        {
+            case S1AP_IE_ENB_UE_ID:
+                {
+	                ue_info.msg_data.ue_attach_info_m.s1ap_enb_ue_id = s1_init_ies->data[i].val.enb_ue_s1ap_id;
+                }break;
+            case S1AP_IE_TAI:
+                {
+                    memcpy(&(ue_info.msg_data.ue_attach_info_m.tai), &(s1_init_ies->data[i].val.tai), sizeof(struct TAI));
+                }break;
+            case S1AP_IE_UTRAN_CGI:
+                {
+                    memcpy(&(ue_info.msg_data.ue_attach_info_m.utran_cgi), &(s1_init_ies->data[i].val.utran_cgi),
+                           sizeof(struct CGI));
+                }break;
+            case S1AP_IE_NAS_PDU:
+                {
+                    while(nas_index < s1_init_ies->data[i].val.nas.elements_len)
+                    {
+                        log_msg(LOG_INFO, "nasIndex %d, msgType %d\n",
+                                nas_index,
+                                s1_init_ies->data[i].val.nas.elements[nas_index].msgType);
+                        ue_info.msg_data.ue_attach_info_m.seq_no = s1_init_ies->data[i].val.nas.header.seq_no;
+                        switch(s1_init_ies->data[i].val.nas.elements[nas_index].msgType)
+                        {
+                            case NAS_IE_TYPE_ESM_MSG:
+                                {
+                                    break;
+                                }
+                            case NAS_IE_TYPE_EPS_MOBILE_ID_IMSI:
+                                {
+                                    ue_info.msg_data.ue_attach_info_m.flags = s1_init_ies->data[i].val.nas.flags;
+                                    if(UE_ID_IMSI(s1_init_ies->data[i].val.nas.flags))
+                                    { 
+                                        memcpy(&(ue_info.msg_data.ue_attach_info_m.IMSI), 
+                                               &(s1_init_ies->data[i].val.nas.elements[nas_index].pduElement.IMSI),
+                                               BINARY_IMSI_LEN);
+                                    }
+                                    else if(UE_ID_GUTI(s1_init_ies->data[i].val.nas.flags))
+                                    {
+                                        memcpy(&(ue_info.msg_data.ue_attach_info_m.mi_guti), &(s1_init_ies->data[i].val.nas.elements[nas_index].pduElement.mi_guti),
+                                               sizeof(struct guti));
+                                    }
+                                    break;
+                                }
+                            case NAS_IE_TYPE_UE_NETWORK_CAPABILITY:
+                                {
+                                    memcpy(&(ue_info.msg_data.ue_attach_info_m.ue_net_capab),
+                                           &(s1_init_ies->data[i].val.nas.\
+                                             elements[nas_index].pduElement.ue_network),
+                                           sizeof(struct UE_net_capab));
+
+                                    break;
+                                }
+                            case NAS_IE_TYPE_MS_NETWORK_CAPABILITY:
+                                {
+                                    memcpy(&(ue_info.msg_data.ue_attach_info_m.ms_net_capab),
+                                           &(s1_init_ies->data[i].val.nas.\
+                                             elements[nas_index].pduElement.ms_network),
+                                           sizeof(struct MS_net_capab));
+
+                                    break;
+                                }
+                            case NAS_IE_TYPE_TX_FLAG:
+                                {
+                                    ue_info.msg_data.ue_attach_info_m.esm_info_tx_required =
+                                        s1_init_ies->data[i].val.nas.elements[nas_index].pduElement.esm_info_tx_required;
+				    log_msg(LOG_INFO, "ESM info flag %d \n", ue_info.msg_data.ue_attach_info_m.esm_info_tx_required);
+                                    break;
+                                }
+                            case NAS_IE_TYPE_PTI:
+                                {
+                                    ue_info.msg_data.ue_attach_info_m.pti =
+                                        s1_init_ies->data[i].val.nas.elements[nas_index].pduElement.pti;
+                                    break;
+                                }
+                            case NAS_IE_TYPE_PCO:
+                                {
+                                    for(int pco=0; pco < 10; pco++)
+                                    {
+                                        ue_info.msg_data.ue_attach_info_m.pco_options[pco] = 
+                                            s1_init_ies->data[i].val.nas.elements[nas_index].pduElement.pco_options[pco];
+                                    }
+                                    break;
+                                }
+                            default:
+                                {
+                                    log_msg(LOG_INFO, "nas element not handled\n");
+                                }
+                        }
+
+                        nas_index++;
+                    }
+
+                }break;
+            default:
+                log_msg(LOG_WARNING,"Unhandled IE");
+        }
+    }
+
+	ue_info.destInstAddr = htonl(mmeAppInstanceNum_c);
+	ue_info.srcInstAddr = htonl(s1apAppInstanceNum_c);
+
+	send_tipc_message(ipc_S1ap_Hndl, mmeAppInstanceNum_c, (char *)&ue_info, S1_READ_MSG_BUF_SIZE);
+
+	/*Send S1Setup response*/
+	log_msg(LOG_INFO, "Send to mme-app stage1.\n");
+
+	return SUCCESS;
+}
+
+