diff --git a/openair2/F1AP/lib/f1ap_interface_management.c b/openair2/F1AP/lib/f1ap_interface_management.c
index 674bae84de..544b89893b 100644
--- a/openair2/F1AP/lib/f1ap_interface_management.c
+++ b/openair2/F1AP/lib/f1ap_interface_management.c
@@ -856,3 +856,117 @@ void free_f1ap_setup_response(const f1ap_setup_resp_t *msg)
       if (msg->cells_to_activate[i].SI_msg[j].SI_container_length > 0)
         free(msg->cells_to_activate[i].SI_msg[j].SI_container);
 }
+
+/* ====================================
+ *          F1AP Setup Failure
+ * ==================================== */
+
+/**
+ * @brief F1AP Setup Failure encoding
+ */
+F1AP_F1AP_PDU_t *encode_f1ap_setup_failure(const f1ap_setup_failure_t *msg)
+{
+  F1AP_F1AP_PDU_t *pdu = calloc_or_fail(1, sizeof(*pdu));
+  /* Create */
+  /* 0. Message Type */
+  asn1cCalloc(pdu->choice.unsuccessfulOutcome, UnsuccessfulOutcome);
+  pdu->present = F1AP_F1AP_PDU_PR_unsuccessfulOutcome;
+  UnsuccessfulOutcome->procedureCode = F1AP_ProcedureCode_id_F1Setup;
+  UnsuccessfulOutcome->criticality = F1AP_Criticality_reject;
+  UnsuccessfulOutcome->value.present = F1AP_UnsuccessfulOutcome__value_PR_F1SetupFailure;
+  F1AP_F1SetupFailure_t *out = &pdu->choice.unsuccessfulOutcome->value.choice.F1SetupFailure;
+  /* mandatory */
+  /* c1. Transaction ID (integer value)*/
+  asn1cSequenceAdd(out->protocolIEs.list, F1AP_F1SetupFailureIEs_t, ie1);
+  ie1->id = F1AP_ProtocolIE_ID_id_TransactionID;
+  ie1->criticality = F1AP_Criticality_reject;
+  ie1->value.present = F1AP_F1SetupFailureIEs__value_PR_TransactionID;
+  ie1->value.choice.TransactionID = msg->transaction_id;
+  /* mandatory */
+  /* c2. Cause */
+  asn1cSequenceAdd(out->protocolIEs.list, F1AP_F1SetupFailureIEs_t, ie2);
+  ie2->id = F1AP_ProtocolIE_ID_id_Cause;
+  ie2->criticality = F1AP_Criticality_ignore;
+  ie2->value.present = F1AP_F1SetupFailureIEs__value_PR_Cause;
+  ie2->value.choice.Cause.present = F1AP_Cause_PR_radioNetwork;
+  ie2->value.choice.Cause.choice.radioNetwork = msg->cause;
+  /* optional */
+  /* c3. TimeToWait */
+  if (msg->time_to_wait > 0) {
+    asn1cSequenceAdd(out->protocolIEs.list, F1AP_F1SetupFailureIEs_t, ie3);
+    ie3->id = F1AP_ProtocolIE_ID_id_TimeToWait;
+    ie3->criticality = F1AP_Criticality_ignore;
+    ie3->value.present = F1AP_F1SetupFailureIEs__value_PR_TimeToWait;
+    ie3->value.choice.TimeToWait = F1AP_TimeToWait_v10s;
+  }
+  /* optional */
+  /* c4. CriticalityDiagnostics*/
+  if (msg->criticality_diagnostics) {
+    asn1cSequenceAdd(out->protocolIEs.list, F1AP_F1SetupFailureIEs_t, ie4);
+    ie4->id = F1AP_ProtocolIE_ID_id_CriticalityDiagnostics;
+    ie4->criticality = F1AP_Criticality_ignore;
+    ie4->value.present = F1AP_F1SetupFailureIEs__value_PR_CriticalityDiagnostics;
+    asn1cCallocOne(ie4->value.choice.CriticalityDiagnostics.procedureCode, F1AP_ProcedureCode_id_UEContextSetup);
+    asn1cCallocOne(ie4->value.choice.CriticalityDiagnostics.triggeringMessage, F1AP_TriggeringMessage_initiating_message);
+    asn1cCallocOne(ie4->value.choice.CriticalityDiagnostics.procedureCriticality, F1AP_Criticality_reject);
+    asn1cCallocOne(ie4->value.choice.CriticalityDiagnostics.transactionID, 0);
+  }
+  return pdu;
+}
+
+/**
+ * @brief F1AP Setup Failure decoding
+ */
+bool decode_f1ap_setup_failure(const F1AP_F1AP_PDU_t *pdu, f1ap_setup_failure_t *out)
+{
+  F1AP_F1SetupFailureIEs_t *ie;
+  F1AP_F1SetupFailure_t *in = &pdu->choice.unsuccessfulOutcome->value.choice.F1SetupFailure;
+  /* Check presence of mandatory IEs */
+  F1AP_LIB_FIND_IE(F1AP_F1SetupFailureIEs_t, ie, in, F1AP_ProtocolIE_ID_id_TransactionID, true);
+  F1AP_LIB_FIND_IE(F1AP_F1SetupFailureIEs_t, ie, in, F1AP_ProtocolIE_ID_id_Cause, true);
+  /* Loop over all IEs */
+  for (int i = 0; i < in->protocolIEs.list.count; i++) {
+    ie = in->protocolIEs.list.array[i];
+    switch (ie->id) {
+      case F1AP_ProtocolIE_ID_id_TransactionID:
+        /* Transaction ID (M) */
+        out->transaction_id = ie->value.choice.TransactionID;
+        break;
+      case F1AP_ProtocolIE_ID_id_Cause:
+        /* Cause (M) */
+        out->cause = ie->value.choice.Cause.choice.radioNetwork;
+        break;
+      case F1AP_ProtocolIE_ID_id_TimeToWait:
+        out->time_to_wait = ie->value.choice.TimeToWait;
+        break;
+      case F1AP_ProtocolIE_ID_id_CriticalityDiagnostics:
+        AssertError(1 == 0, return false, "F1AP_ProtocolIE_ID_id_CriticalityDiagnostics is not supported");
+        break;
+      default:
+        AssertError(1 == 0, return false, "F1AP_ProtocolIE_ID_id %ld unknown\n", ie->id);
+        break;
+    }
+  }
+  return true;
+}
+
+/**
+ * @brief F1AP Setup Failure equality check
+ */
+bool eq_f1ap_setup_failure(const f1ap_setup_failure_t *a, const f1ap_setup_failure_t *b)
+{
+  if (a->transaction_id != b->transaction_id)
+    return false;
+  return true;
+}
+
+/**
+ * @brief F1AP Setup Failure deep copy
+ */
+f1ap_setup_failure_t cp_f1ap_setup_failure(const f1ap_setup_failure_t *msg)
+{
+  f1ap_setup_failure_t cp = {0};
+  /* transaction_id */
+  cp.transaction_id = msg->transaction_id;
+  return cp;
+}
diff --git a/openair2/F1AP/lib/f1ap_interface_management.h b/openair2/F1AP/lib/f1ap_interface_management.h
index 33a5f8402b..ca0b7df491 100644
--- a/openair2/F1AP/lib/f1ap_interface_management.h
+++ b/openair2/F1AP/lib/f1ap_interface_management.h
@@ -40,4 +40,10 @@ void free_f1ap_setup_response(const f1ap_setup_resp_t *msg);
 f1ap_setup_resp_t cp_f1ap_setup_response(const f1ap_setup_resp_t *msg);
 bool eq_f1ap_setup_response(const f1ap_setup_resp_t *a, const f1ap_setup_resp_t *b);
 
+/* F1 Setup Failure */
+struct F1AP_F1AP_PDU *encode_f1ap_setup_failure(const f1ap_setup_failure_t *msg);
+bool decode_f1ap_setup_failure(const struct F1AP_F1AP_PDU *pdu, f1ap_setup_failure_t *out);
+bool eq_f1ap_setup_failure(const f1ap_setup_failure_t *a, const f1ap_setup_failure_t *b);
+f1ap_setup_failure_t cp_f1ap_setup_failure(const f1ap_setup_failure_t *msg);
+
 #endif /* F1AP_INTERFACE_MANAGEMENT_H_ */
diff --git a/openair2/F1AP/lib/f1ap_lib_includes.h b/openair2/F1AP/lib/f1ap_lib_includes.h
index 2386073dee..6ff60a4897 100644
--- a/openair2/F1AP/lib/f1ap_lib_includes.h
+++ b/openair2/F1AP/lib/f1ap_lib_includes.h
@@ -39,5 +39,6 @@
 #include "F1AP_FreqBandNrItem.h"
 #include "F1AP_SuccessfulOutcome.h"
 #include "F1AP_SibtypetobeupdatedListItem.h"
+#include "F1AP_UnsuccessfulOutcome.h"
 
 #endif /* F1AP_LIB_INCLUDES_H_ */