diff --git a/openair2/COMMON/f1ap_messages_def.h b/openair2/COMMON/f1ap_messages_def.h
index 7c67b22756..08f552d9d3 100644
--- a/openair2/COMMON/f1ap_messages_def.h
+++ b/openair2/COMMON/f1ap_messages_def.h
@@ -40,6 +40,7 @@ MESSAGE_DEF(F1AP_UL_RRC_MESSAGE                , MESSAGE_PRIORITY_MED, f1ap_ul_r
 MESSAGE_DEF(F1AP_UE_CONTEXT_RELEASE_REQ, MESSAGE_PRIORITY_MED, f1ap_ue_context_release_req_t, f1ap_ue_context_release_req)
 MESSAGE_DEF(F1AP_UE_CONTEXT_RELEASE_CMD, MESSAGE_PRIORITY_MED, f1ap_ue_context_release_cmd_t, f1ap_ue_context_release_cmd)
 MESSAGE_DEF(F1AP_UE_CONTEXT_RELEASE_COMPLETE, MESSAGE_PRIORITY_MED, f1ap_ue_context_release_complete_t, f1ap_ue_context_release_complete)
+MESSAGE_DEF(F1AP_UE_CONTEXT_MODIFICATION_REQUIRED, MESSAGE_PRIORITY_MED, f1ap_ue_context_modif_required_t, f1ap_ue_context_modification_required)
 
 /* RRC -> F1AP  messages */
 MESSAGE_DEF(F1AP_DL_RRC_MESSAGE              , MESSAGE_PRIORITY_MED, f1ap_dl_rrc_message_t              , f1ap_dl_rrc_message )
@@ -48,6 +49,8 @@ MESSAGE_DEF(F1AP_UE_CONTEXT_SETUP_REQ,  MESSAGE_PRIORITY_MED, f1ap_ue_context_se
 MESSAGE_DEF(F1AP_UE_CONTEXT_SETUP_RESP, MESSAGE_PRIORITY_MED, f1ap_ue_context_setup_t, f1ap_ue_context_setup_resp)
 MESSAGE_DEF(F1AP_UE_CONTEXT_MODIFICATION_REQ, MESSAGE_PRIORITY_MED, f1ap_ue_context_modif_req_t, f1ap_ue_context_modification_req)
 MESSAGE_DEF(F1AP_UE_CONTEXT_MODIFICATION_RESP, MESSAGE_PRIORITY_MED, f1ap_ue_context_modif_resp_t, f1ap_ue_context_modification_resp)
+MESSAGE_DEF(F1AP_UE_CONTEXT_MODIFICATION_CONFIRM, MESSAGE_PRIORITY_MED, f1ap_ue_context_modif_confirm_t, f1ap_ue_context_modification_confirm)
+MESSAGE_DEF(F1AP_UE_CONTEXT_MODIFICATION_REFUSE, MESSAGE_PRIORITY_MED, f1ap_ue_context_modif_refuse_t, f1ap_ue_context_modification_refuse)
 
 /* CU -> DU*/
 MESSAGE_DEF(F1AP_PAGING_IND, MESSAGE_PRIORITY_MED, f1ap_paging_ind_t, f1ap_paging_ind)
diff --git a/openair2/COMMON/f1ap_messages_types.h b/openair2/COMMON/f1ap_messages_types.h
index 3d594a695e..2f95ee8cdc 100644
--- a/openair2/COMMON/f1ap_messages_types.h
+++ b/openair2/COMMON/f1ap_messages_types.h
@@ -44,6 +44,9 @@
 #define F1AP_UE_CONTEXT_MODIFICATION_REQ(mSGpTR)   (mSGpTR)->ittiMsg.f1ap_ue_context_modification_req
 #define F1AP_UE_CONTEXT_MODIFICATION_RESP(mSGpTR)  (mSGpTR)->ittiMsg.f1ap_ue_context_modification_resp
 #define F1AP_UE_CONTEXT_MODIFICATION_FAIL(mSGpTR)  (mSGpTR)->ittiMsg.f1ap_ue_context_modification_fail
+#define F1AP_UE_CONTEXT_MODIFICATION_REQUIRED(mSGpTR)   (mSGpTR)->ittiMsg.f1ap_ue_context_modification_required
+#define F1AP_UE_CONTEXT_MODIFICATION_CONFIRM(mSGpTR)  (mSGpTR)->ittiMsg.f1ap_ue_context_modification_confirm
+#define F1AP_UE_CONTEXT_MODIFICATION_REFUSE(mSGpTR)  (mSGpTR)->ittiMsg.f1ap_ue_context_modification_refuse
 
 #define F1AP_DL_RRC_MESSAGE(mSGpTR)                (mSGpTR)->ittiMsg.f1ap_dl_rrc_message
 #define F1AP_UE_CONTEXT_RELEASE_REQ(mSGpTR)        (mSGpTR)->ittiMsg.f1ap_ue_context_release_req
@@ -417,6 +420,28 @@ typedef enum F1ap_Cause_e {
   F1AP_CAUSE_MISC,
 } f1ap_Cause_t;
 
+typedef struct f1ap_ue_context_modif_required_t {
+  uint32_t gNB_CU_ue_id;
+  uint32_t gNB_DU_ue_id;
+  du_to_cu_rrc_information_t *du_to_cu_rrc_information;
+  f1ap_Cause_t cause;
+  long cause_value;
+} f1ap_ue_context_modif_required_t;
+
+typedef struct f1ap_ue_context_modif_confirm_t {
+  uint32_t gNB_CU_ue_id;
+  uint32_t gNB_DU_ue_id;
+  uint8_t *rrc_container;
+  int      rrc_container_length;
+} f1ap_ue_context_modif_confirm_t;
+
+typedef struct f1ap_ue_context_modif_refuse_t {
+  uint32_t gNB_CU_ue_id;
+  uint32_t gNB_DU_ue_id;
+  f1ap_Cause_t cause;
+  long cause_value;
+} f1ap_ue_context_modif_refuse_t;
+
 typedef struct f1ap_ue_context_release_s {
   uint32_t gNB_CU_ue_id;
   uint32_t gNB_DU_ue_id;
diff --git a/openair2/F1AP/f1ap_cu_task.c b/openair2/F1AP/f1ap_cu_task.c
index 7cc23e88fa..617366563c 100644
--- a/openair2/F1AP/f1ap_cu_task.c
+++ b/openair2/F1AP/f1ap_cu_task.c
@@ -184,6 +184,16 @@ void *F1AP_CU_task(void *arg) {
                        &F1AP_PAGING_IND(received_msg));
         break;
 
+      case F1AP_UE_CONTEXT_MODIFICATION_CONFIRM:
+        CU_send_UE_CONTEXT_MODIFICATION_CONFIRM(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
+                                                &F1AP_UE_CONTEXT_MODIFICATION_CONFIRM(received_msg));
+        break;
+
+      case F1AP_UE_CONTEXT_MODIFICATION_REFUSE:
+        CU_send_UE_CONTEXT_MODIFICATION_REFUSE(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
+                                               &F1AP_UE_CONTEXT_MODIFICATION_REFUSE(received_msg));
+        break;
+
       //    case F1AP_SETUP_RESPONSE: // This is from RRC
       //    CU_send_F1_SETUP_RESPONSE(instance, *f1ap_setup_ind, &(F1AP_SETUP_RESP) f1ap_setup_resp)
       //        break;
diff --git a/openair2/F1AP/f1ap_cu_ue_context_management.c b/openair2/F1AP/f1ap_cu_ue_context_management.c
index a72a359c5b..b5d3ea0ec8 100644
--- a/openair2/F1AP/f1ap_cu_ue_context_management.c
+++ b/openair2/F1AP/f1ap_cu_ue_context_management.c
@@ -1701,14 +1701,20 @@ int CU_handle_UE_CONTEXT_MODIFICATION_FAILURE(instance_t       instance,
   AssertFatal(1==0,"Not implemented yet\n");
 }
 
-int CU_handle_UE_CONTEXT_MODIFICATION_REQUIRED(instance_t       instance,
-    uint32_t         assoc_id,
-    uint32_t         stream,
-    F1AP_F1AP_PDU_t *pdu) {
-  AssertFatal(1==0,"Not implemented yet\n");
+int CU_handle_UE_CONTEXT_MODIFICATION_REQUIRED(instance_t instance, uint32_t assoc_id, uint32_t stream, F1AP_F1AP_PDU_t *pdu)
+{
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+  return 0;
 }
 
-int CU_send_UE_CONTEXT_MODIFICATION_CONFIRM(instance_t instance,
-    F1AP_UEContextModificationConfirm_t UEContextModificationConfirm_t) {
-  AssertFatal(1==0,"Not implemented yet\n");
+int CU_send_UE_CONTEXT_MODIFICATION_CONFIRM(instance_t instance, f1ap_ue_context_modif_confirm_t *confirm)
+{
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+  return 0;
+}
+
+int CU_send_UE_CONTEXT_MODIFICATION_REFUSE(instance_t instance, f1ap_ue_context_modif_refuse_t *refuse)
+{
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+  return 0;
 }
diff --git a/openair2/F1AP/f1ap_cu_ue_context_management.h b/openair2/F1AP/f1ap_cu_ue_context_management.h
index 32a54bc6cc..76bbecb2b8 100644
--- a/openair2/F1AP/f1ap_cu_ue_context_management.h
+++ b/openair2/F1AP/f1ap_cu_ue_context_management.h
@@ -85,12 +85,11 @@ int CU_handle_UE_CONTEXT_MODIFICATION_FAILURE(instance_t       instance,
 /*
  * UE Context Modification Required (gNB-DU initiated)
  */
-int CU_handle_UE_CONTEXT_MODIFICATION_REQUIRED(instance_t       instance,
-    uint32_t         assoc_id,
-    uint32_t         stream,
-    F1AP_F1AP_PDU_t *pdu);
-int CU_send_UE_CONTEXT_MODIFICATION_CONFIRM(instance_t instance,
-    F1AP_UEContextModificationConfirm_t UEContextModificationConfirm_t);
+int CU_handle_UE_CONTEXT_MODIFICATION_REQUIRED(instance_t instance, uint32_t assoc_id, uint32_t stream, F1AP_F1AP_PDU_t *pdu);
+
+int CU_send_UE_CONTEXT_MODIFICATION_CONFIRM(instance_t instance, f1ap_ue_context_modif_confirm_t *confirm);
+
+int CU_send_UE_CONTEXT_MODIFICATION_REFUSE(instance_t instance, f1ap_ue_context_modif_refuse_t *refuse);
 
 /*
  * UE Inactivity Notification
diff --git a/openair2/F1AP/f1ap_du_task.c b/openair2/F1AP/f1ap_du_task.c
index a7af049c2a..8f8258a1f8 100644
--- a/openair2/F1AP/f1ap_du_task.c
+++ b/openair2/F1AP/f1ap_du_task.c
@@ -169,6 +169,10 @@ void *F1AP_DU_task(void *arg) {
         DU_send_UE_CONTEXT_RELEASE_COMPLETE(myInstance, &F1AP_UE_CONTEXT_RELEASE_COMPLETE(msg));
         break;
 
+      case F1AP_UE_CONTEXT_MODIFICATION_REQUIRED:
+        DU_send_UE_CONTEXT_MODIFICATION_REQUIRED(myInstance, &F1AP_UE_CONTEXT_MODIFICATION_REQUIRED(msg));
+        break;
+
       case TERMINATE_MESSAGE:
         LOG_W(F1AP, " *** Exiting F1AP thread\n");
         itti_exit_task();
diff --git a/openair2/F1AP/f1ap_du_ue_context_management.c b/openair2/F1AP/f1ap_du_ue_context_management.c
index 2430b2f870..69410f3bc5 100644
--- a/openair2/F1AP/f1ap_du_ue_context_management.c
+++ b/openair2/F1AP/f1ap_du_ue_context_management.c
@@ -1285,12 +1285,21 @@ int DU_send_UE_CONTEXT_MODIFICATION_RESPONSE(instance_t instance, f1ap_ue_contex
 int DU_send_UE_CONTEXT_MODIFICATION_FAILURE(instance_t instance) {
   AssertFatal(1==0,"Not implemented yet\n");
 }
-int DU_send_UE_CONTEXT_MODIFICATION_REQUIRED(instance_t instance) {
-  AssertFatal(1==0,"Not implemented yet\n");
+
+int DU_send_UE_CONTEXT_MODIFICATION_REQUIRED(instance_t instance, f1ap_ue_context_modif_required_t *required)
+{
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+  return 0;
 }
-int DU_handle_UE_CONTEXT_MODIFICATION_CONFIRM(instance_t       instance,
-    uint32_t         assoc_id,
-    uint32_t         stream,
-    F1AP_F1AP_PDU_t *pdu) {
-  AssertFatal(1==0,"Not implemented yet\n");
+
+int DU_handle_UE_CONTEXT_MODIFICATION_CONFIRM(instance_t instance, uint32_t assoc_id, uint32_t stream, F1AP_F1AP_PDU_t *pdu)
+{
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+  return 0;
+}
+
+int DU_handle_UE_CONTEXT_MODIFICATION_REFUSE(instance_t instance, uint32_t assoc_id, uint32_t stream, F1AP_F1AP_PDU_t *pdu)
+{
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+  return 0;
 }
diff --git a/openair2/F1AP/f1ap_du_ue_context_management.h b/openair2/F1AP/f1ap_du_ue_context_management.h
index 51b8fa6dce..cd8565f328 100644
--- a/openair2/F1AP/f1ap_du_ue_context_management.h
+++ b/openair2/F1AP/f1ap_du_ue_context_management.h
@@ -79,13 +79,11 @@ int DU_send_UE_CONTEXT_MODIFICATION_FAILURE(instance_t instance);
 /*
  * UE Context Modification Required (gNB-DU initiated)
  */
-int DU_send_UE_CONTEXT_MODIFICATION_REQUIRED(instance_t instance);
-int DU_handle_UE_CONTEXT_MODIFICATION_CONFIRM(instance_t       instance,
-    uint32_t         assoc_id,
-    uint32_t         stream,
-    F1AP_F1AP_PDU_t *pdu);
+int DU_send_UE_CONTEXT_MODIFICATION_REQUIRED(instance_t instance, f1ap_ue_context_modif_required_t *required);
 
-int DU_send_UE_CONTEXT_SETUP_RESPONSE(instance_t instance, f1ap_ue_context_setup_t *req);
+int DU_handle_UE_CONTEXT_MODIFICATION_CONFIRM(instance_t instance, uint32_t assoc_id, uint32_t stream, F1AP_F1AP_PDU_t *pdu);
+
+int DU_handle_UE_CONTEXT_MODIFICATION_REFUSE(instance_t instance, uint32_t assoc_id, uint32_t stream, F1AP_F1AP_PDU_t *pdu);
 
 /*
  * UE Inactivity Notification
diff --git a/openair2/F1AP/f1ap_handlers.c b/openair2/F1AP/f1ap_handlers.c
index 8b6cc38fec..259de1f9d5 100644
--- a/openair2/F1AP/f1ap_handlers.c
+++ b/openair2/F1AP/f1ap_handlers.c
@@ -52,7 +52,7 @@ static const f1ap_message_processing_t f1ap_messages_processing[][3] = {
     {DU_handle_UE_CONTEXT_SETUP_REQUEST, CU_handle_UE_CONTEXT_SETUP_RESPONSE, 0}, /* UEContextSetup */
     {DU_handle_UE_CONTEXT_RELEASE_COMMAND, CU_handle_UE_CONTEXT_RELEASE_COMPLETE, 0}, /* UEContextRelease */
     {DU_handle_UE_CONTEXT_MODIFICATION_REQUEST, CU_handle_UE_CONTEXT_MODIFICATION_RESPONSE, 0}, /* UEContextModification */
-    {0, 0, 0}, /* UEContextModificationRequired */
+    {CU_handle_UE_CONTEXT_MODIFICATION_REQUIRED, DU_handle_UE_CONTEXT_MODIFICATION_CONFIRM, DU_handle_UE_CONTEXT_MODIFICATION_REFUSE}, /* UEContextModificationRequired */
     {0, 0, 0}, /* UEMobilityCommand */
     {CU_handle_UE_CONTEXT_RELEASE_REQUEST, 0, 0}, /* UEContextReleaseRequest */
     {CU_handle_INITIAL_UL_RRC_MESSAGE_TRANSFER, 0, 0}, /* InitialULRRCMessageTransfer */
diff --git a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.c b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.c
index 0a450a1198..7e6df48e38 100644
--- a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.c
+++ b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.c
@@ -243,6 +243,18 @@ void ue_context_modification_request(const f1ap_ue_context_modif_req_t *req)
   }
 }
 
+void ue_context_modification_confirm(const f1ap_ue_context_modif_confirm_t *confirm)
+{
+  (void) confirm;
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+}
+
+void ue_context_modification_refuse(const f1ap_ue_context_modif_refuse_t *refuse)
+{
+  (void) refuse;
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+}
+
 void ue_context_release_command(const f1ap_ue_context_release_cmd_t *cmd)
 {
   /* mark UE as to be deleted after PUSCH failure */
diff --git a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.h b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.h
index 859e128b4a..ebe6ba5adc 100644
--- a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.h
+++ b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.h
@@ -27,6 +27,8 @@
 
 void ue_context_setup_request(const f1ap_ue_context_setup_t *req);
 void ue_context_modification_request(const f1ap_ue_context_modif_req_t *req);
+void ue_context_modification_confirm(const f1ap_ue_context_modif_confirm_t *confirm);
+void ue_context_modification_refuse(const f1ap_ue_context_modif_refuse_t *refuse);
 void ue_context_release_command(const f1ap_ue_context_release_cmd_t *cmd);
 
 void dl_rrc_message_transfer(const f1ap_dl_rrc_message_t *dl_rrc);
diff --git a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul.h b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul.h
index 5d7a7cd644..43a4818e93 100644
--- a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul.h
+++ b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul.h
@@ -28,6 +28,7 @@
 typedef void (*ue_context_setup_response_func_t)(const f1ap_ue_context_setup_t* req, const f1ap_ue_context_setup_t *resp);
 typedef void (*ue_context_modification_response_func_t)(const f1ap_ue_context_modif_req_t *req,
                                                         const f1ap_ue_context_modif_resp_t *resp);
+typedef void (*ue_context_modification_required_func_t)(const f1ap_ue_context_modif_required_t *t);
 typedef void (*ue_context_release_request_func_t)(const f1ap_ue_context_release_req_t* req);
 typedef void (*ue_context_release_complete_func_t)(const f1ap_ue_context_release_complete_t *complete);
 
diff --git a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul_direct.c b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul_direct.c
index a024abe6af..bb7cec2e87 100644
--- a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul_direct.c
+++ b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul_direct.c
@@ -111,6 +111,11 @@ static void ue_context_modification_response_direct(const f1ap_ue_context_modif_
   itti_send_msg_to_task(TASK_RRC_GNB, 0, msg);
 }
 
+static void ue_context_modification_required_direct(const f1ap_ue_context_modif_required_t *required)
+{
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+}
+
 static void ue_context_release_request_direct(const f1ap_ue_context_release_req_t* req)
 {
   MessageDef *msg = itti_alloc_new_message(TASK_MAC_GNB, 0, F1AP_UE_CONTEXT_RELEASE_REQ);
@@ -151,6 +156,7 @@ void mac_rrc_ul_direct_init(struct nr_mac_rrc_ul_if_s *mac_rrc)
 {
   mac_rrc->ue_context_setup_response = ue_context_setup_response_direct;
   mac_rrc->ue_context_modification_response = ue_context_modification_response_direct;
+  mac_rrc->ue_context_modification_required = ue_context_modification_required_direct;
   mac_rrc->ue_context_release_request = ue_context_release_request_direct;
   mac_rrc->ue_context_release_complete = ue_context_release_complete_direct;
   mac_rrc->initial_ul_rrc_message_transfer = initial_ul_rrc_message_transfer_direct;
diff --git a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul_f1ap.c b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul_f1ap.c
index 644decc21c..c3138c4a5c 100644
--- a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul_f1ap.c
+++ b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_ul_f1ap.c
@@ -96,6 +96,11 @@ static void ue_context_modification_response_f1ap(const f1ap_ue_context_modif_re
   itti_send_msg_to_task(TASK_DU_F1, 0, msg);
 }
 
+static void ue_context_modification_required_f1ap(const f1ap_ue_context_modif_required_t *required)
+{
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+}
+
 static void ue_context_release_request_f1ap(const f1ap_ue_context_release_req_t* req)
 {
   MessageDef *msg = itti_alloc_new_message(TASK_MAC_GNB, 0, F1AP_UE_CONTEXT_RELEASE_REQ);
@@ -138,6 +143,7 @@ void mac_rrc_ul_f1ap_init(struct nr_mac_rrc_ul_if_s *mac_rrc)
 {
   mac_rrc->ue_context_setup_response = ue_context_setup_response_f1ap;
   mac_rrc->ue_context_modification_response = ue_context_modification_response_f1ap;
+  mac_rrc->ue_context_modification_required = ue_context_modification_required_f1ap;
   mac_rrc->ue_context_release_request = ue_context_release_request_f1ap;
   mac_rrc->ue_context_release_complete = ue_context_release_complete_f1ap;
   mac_rrc->initial_ul_rrc_message_transfer = initial_ul_rrc_message_transfer_f1ap;
diff --git a/openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h b/openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h
index 457497679a..2197871845 100644
--- a/openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h
+++ b/openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h
@@ -660,6 +660,7 @@ typedef struct NR_bler_options {
 typedef struct nr_mac_rrc_ul_if_s {
   ue_context_setup_response_func_t ue_context_setup_response;
   ue_context_modification_response_func_t ue_context_modification_response;
+  ue_context_modification_required_func_t ue_context_modification_required;
   ue_context_release_request_func_t ue_context_release_request;
   ue_context_release_complete_func_t ue_context_release_complete;
   initial_ul_rrc_message_transfer_func_t initial_ul_rrc_message_transfer;
diff --git a/openair2/RRC/NR/mac_rrc_dl.h b/openair2/RRC/NR/mac_rrc_dl.h
index 94920f6f64..0180f972fe 100644
--- a/openair2/RRC/NR/mac_rrc_dl.h
+++ b/openair2/RRC/NR/mac_rrc_dl.h
@@ -27,6 +27,8 @@
 
 typedef void (*ue_context_setup_request_func_t)(const f1ap_ue_context_setup_t *req);
 typedef void (*ue_context_modification_request_func_t)(const f1ap_ue_context_modif_req_t *req);
+typedef void (*ue_context_modification_confirm_func_t)(const f1ap_ue_context_modif_confirm_t *confirm);
+typedef void (*ue_context_modification_refuse_func_t)(const f1ap_ue_context_modif_refuse_t *refuse);
 typedef void (*ue_context_release_command_func_t)(const f1ap_ue_context_release_cmd_t *cmd);
 
 typedef void (*dl_rrc_message_transfer_func_t)(const f1ap_dl_rrc_message_t *dl_rrc);
diff --git a/openair2/RRC/NR/mac_rrc_dl_direct.c b/openair2/RRC/NR/mac_rrc_dl_direct.c
index eeec72e132..423eac2462 100644
--- a/openair2/RRC/NR/mac_rrc_dl_direct.c
+++ b/openair2/RRC/NR/mac_rrc_dl_direct.c
@@ -28,6 +28,8 @@ void mac_rrc_dl_direct_init(nr_mac_rrc_dl_if_t *mac_rrc)
 {
   mac_rrc->ue_context_setup_request = ue_context_setup_request;
   mac_rrc->ue_context_modification_request = ue_context_modification_request;
+  mac_rrc->ue_context_modification_confirm = ue_context_modification_confirm;
+  mac_rrc->ue_context_modification_refuse = ue_context_modification_refuse;
   mac_rrc->ue_context_release_command = ue_context_release_command;
   mac_rrc->dl_rrc_message_transfer = dl_rrc_message_transfer;
 }
diff --git a/openair2/RRC/NR/mac_rrc_dl_f1ap.c b/openair2/RRC/NR/mac_rrc_dl_f1ap.c
index 3f3b0f800f..3d554f80cc 100644
--- a/openair2/RRC/NR/mac_rrc_dl_f1ap.c
+++ b/openair2/RRC/NR/mac_rrc_dl_f1ap.c
@@ -71,6 +71,18 @@ static void ue_context_modification_request_f1ap(const f1ap_ue_context_modif_req
   itti_send_msg_to_task(TASK_CU_F1, 0, msg);
 }
 
+static void ue_context_modification_confirm_f1ap(const f1ap_ue_context_modif_confirm_t *confirm)
+{
+  (void)confirm;
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+}
+
+static void ue_context_modification_refuse_f1ap(const f1ap_ue_context_modif_refuse_t *refuse)
+{
+  (void)refuse;
+  AssertFatal(false, "%s() not implemented yet\n", __func__);
+}
+
 static void ue_context_release_command_f1ap(const f1ap_ue_context_release_cmd_t *cmd)
 {
   MessageDef *message_p = itti_alloc_new_message (TASK_RRC_GNB, 0, F1AP_UE_CONTEXT_RELEASE_CMD);
@@ -110,6 +122,8 @@ void mac_rrc_dl_f1ap_init(nr_mac_rrc_dl_if_t *mac_rrc)
 {
   mac_rrc->ue_context_setup_request = ue_context_setup_request_f1ap;
   mac_rrc->ue_context_modification_request = ue_context_modification_request_f1ap;
+  mac_rrc->ue_context_modification_confirm = ue_context_modification_confirm_f1ap;
+  mac_rrc->ue_context_modification_refuse = ue_context_modification_refuse_f1ap;
   mac_rrc->ue_context_release_command = ue_context_release_command_f1ap;
   mac_rrc->dl_rrc_message_transfer = dl_rrc_message_transfer_f1ap;
 }
diff --git a/openair2/RRC/NR/nr_rrc_defs.h b/openair2/RRC/NR/nr_rrc_defs.h
index f9c821736c..35ff709378 100644
--- a/openair2/RRC/NR/nr_rrc_defs.h
+++ b/openair2/RRC/NR/nr_rrc_defs.h
@@ -365,6 +365,8 @@ typedef struct {
 typedef struct nr_mac_rrc_dl_if_s {
   ue_context_setup_request_func_t ue_context_setup_request;
   ue_context_modification_request_func_t ue_context_modification_request;
+  ue_context_modification_confirm_func_t ue_context_modification_confirm;
+  ue_context_modification_refuse_func_t ue_context_modification_refuse;
   ue_context_release_command_func_t ue_context_release_command;
   dl_rrc_message_transfer_func_t dl_rrc_message_transfer;
 } nr_mac_rrc_dl_if_t;