diff --git a/openair3/NAS/CMakeLists.txt b/openair3/NAS/CMakeLists.txt
index 39bfc888dd..ff9a1bcf99 100644
--- a/openair3/NAS/CMakeLists.txt
+++ b/openair3/NAS/CMakeLists.txt
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: LicenseRef-CSSL-1.0
 
+add_compile_options(-Wunused-parameter)
 add_subdirectory(COMMON)
 add_subdirectory(NR_UE)
 add_subdirectory(UE)
diff --git a/openair3/NAS/COMMON/IES/AuthenticationResponseParameter.c b/openair3/NAS/COMMON/IES/AuthenticationResponseParameter.c
index e2ebd90feb..6fd5722030 100644
--- a/openair3/NAS/COMMON/IES/AuthenticationResponseParameter.c
+++ b/openair3/NAS/COMMON/IES/AuthenticationResponseParameter.c
@@ -32,7 +32,7 @@ int decode_authentication_response_parameter(AuthenticationResponseParameter *au
     decoded += decode_result;
 
 #if defined (NAS_DEBUG)
-  dump_authentication_response_parameter_xml(authenticationresponseparameter, iei);
+  dump_authentication_response_parameter_xml(authenticationresponseparameter);
 #endif
   return decoded;
 }
@@ -47,7 +47,7 @@ int encode_authentication_response_parameter(const AuthenticationResponseParamet
   /* Checking IEI and pointer */
   CHECK_PDU_POINTER_AND_LENGTH_ENCODER(buffer, AUTHENTICATION_RESPONSE_PARAMETER_MINIMUM_LENGTH, len);
 #if defined (NAS_DEBUG)
-  dump_authentication_response_parameter_xml(authenticationresponseparameter, iei);
+  dump_authentication_response_parameter_xml(authenticationresponseparameter);
 #endif
 
   if (iei > 0) {
@@ -67,7 +67,7 @@ int encode_authentication_response_parameter(const AuthenticationResponseParamet
   return encoded;
 }
 
-void dump_authentication_response_parameter_xml(AuthenticationResponseParameter *authenticationresponseparameter, uint8_t iei)
+void dump_authentication_response_parameter_xml(AuthenticationResponseParameter *authenticationresponseparameter)
 {
   printf("<Authentication Response Parameter>\n");
   dump_octet_string_xml(&authenticationresponseparameter->res);
diff --git a/openair3/NAS/COMMON/IES/AuthenticationResponseParameter.h b/openair3/NAS/COMMON/IES/AuthenticationResponseParameter.h
index 3ac57d7719..45339c3f10 100644
--- a/openair3/NAS/COMMON/IES/AuthenticationResponseParameter.h
+++ b/openair3/NAS/COMMON/IES/AuthenticationResponseParameter.h
@@ -25,7 +25,7 @@ int encode_authentication_response_parameter(const AuthenticationResponseParamet
 
 int decode_authentication_response_parameter(AuthenticationResponseParameter *authenticationresponseparameter, uint8_t iei, uint8_t *buffer, uint32_t len);
 
-void dump_authentication_response_parameter_xml(AuthenticationResponseParameter *authenticationresponseparameter, uint8_t iei);
+void dump_authentication_response_parameter_xml(AuthenticationResponseParameter *authenticationresponseparameter);
 
 #endif /* AUTHENTICATION RESPONSE PARAMETER_H_ */
 
diff --git a/openair3/NAS/NR_UE/5GS/5GMM/IES/FGSRegistrationType.c b/openair3/NAS/NR_UE/5GS/5GMM/IES/FGSRegistrationType.c
index c147080993..6065a7a5da 100644
--- a/openair3/NAS/NR_UE/5GS/5GMM/IES/FGSRegistrationType.c
+++ b/openair3/NAS/NR_UE/5GS/5GMM/IES/FGSRegistrationType.c
@@ -17,7 +17,7 @@
 #define NO_FOLLOW_ON_REQUEST 0x0
 #define FOLLOW_ON_REQUEST 0x08
 
-int decode_5gs_registration_type(FGSRegistrationType *fgsregistrationtype, uint8_t iei, uint8_t value, uint32_t len)
+int decode_5gs_registration_type(FGSRegistrationType *fgsregistrationtype, uint8_t iei, uint8_t value)
 {
   int decoded = 0;
   uint8_t *buffer = &value;
diff --git a/openair3/NAS/NR_UE/5GS/5GMM/IES/FGSRegistrationType.h b/openair3/NAS/NR_UE/5GS/5GMM/IES/FGSRegistrationType.h
index 6f8b3462b2..b11320356e 100644
--- a/openair3/NAS/NR_UE/5GS/5GMM/IES/FGSRegistrationType.h
+++ b/openair3/NAS/NR_UE/5GS/5GMM/IES/FGSRegistrationType.h
@@ -28,6 +28,6 @@ typedef uint8_t FGSRegistrationType;
 
 int encode_5gs_registration_type(const FGSRegistrationType *fgsregistrationtype, bool follow_on_request);
 
-int decode_5gs_registration_type(FGSRegistrationType *fgsregistrationtype, uint8_t iei, uint8_t value, uint32_t len);
+int decode_5gs_registration_type(FGSRegistrationType *fgsregistrationtype, uint8_t iei, uint8_t value);
 
 #endif /* FGS_REGISTRATION_TYPE_H_*/
diff --git a/openair3/NAS/NR_UE/5GS/5GMM/IES/NrUESecurityCapability.c b/openair3/NAS/NR_UE/5GS/5GMM/IES/NrUESecurityCapability.c
index 7b3471dac6..4c155551d8 100644
--- a/openair3/NAS/NR_UE/5GS/5GMM/IES/NrUESecurityCapability.c
+++ b/openair3/NAS/NR_UE/5GS/5GMM/IES/NrUESecurityCapability.c
@@ -10,10 +10,7 @@
 #include "TLVDecoder.h"
 #include "NrUESecurityCapability.h"
 
-int encode_nrue_security_capability(const NrUESecurityCapability *nruesecuritycapability,
-                                    uint8_t iei,
-                                    uint8_t *buffer,
-                                    uint32_t len)
+int encode_nrue_security_capability(const NrUESecurityCapability *nruesecuritycapability, uint8_t iei, uint8_t *buffer)
 {
   int encoded = 0;
   if (iei) {
diff --git a/openair3/NAS/NR_UE/5GS/5GMM/IES/NrUESecurityCapability.h b/openair3/NAS/NR_UE/5GS/5GMM/IES/NrUESecurityCapability.h
index 6d3e787452..e9da0b2751 100644
--- a/openair3/NAS/NR_UE/5GS/5GMM/IES/NrUESecurityCapability.h
+++ b/openair3/NAS/NR_UE/5GS/5GMM/IES/NrUESecurityCapability.h
@@ -20,9 +20,6 @@ typedef struct {
   uint8_t EIA;
 } NrUESecurityCapability;
 
-int encode_nrue_security_capability(const NrUESecurityCapability *nruesecuritycapability,
-                                    uint8_t iei,
-                                    uint8_t *buffer,
-                                    uint32_t len);
+int encode_nrue_security_capability(const NrUESecurityCapability *nruesecuritycapability, uint8_t iei, uint8_t *buffer);
 
 #endif /* NRUE_SECURITY_CAPABILITY_H_ */
diff --git a/openair3/NAS/NR_UE/5GS/5GMM/MSG/RegistrationRequest.c b/openair3/NAS/NR_UE/5GS/5GMM/MSG/RegistrationRequest.c
index f7321cd684..6b99b75cd2 100644
--- a/openair3/NAS/NR_UE/5GS/5GMM/MSG/RegistrationRequest.c
+++ b/openair3/NAS/NR_UE/5GS/5GMM/MSG/RegistrationRequest.c
@@ -23,7 +23,7 @@ int decode_registration_request(registration_request_msg *registration_request,
 
   /* Decoding mandatory fields */
   if ((decoded_result =
-           decode_5gs_registration_type(&registration_request->fgsregistrationtype, 0, *(buffer + decoded) & 0x0f, len - decoded))
+           decode_5gs_registration_type(&registration_request->fgsregistrationtype, 0, *(buffer + decoded) & 0x0f))
       < 0) {
     LOG_FUNC_RETURN(decoded_result);
   }
@@ -76,8 +76,7 @@ int encode_registration_request(const registration_request_msg *registration_req
       == REGISTRATION_REQUEST_UE_SECURITY_CAPABILITY_PRESENT) {
     if ((encode_result = encode_nrue_security_capability(&registration_request->nruesecuritycapability,
                                                          REGISTRATION_REQUEST_UE_SECURITY_CAPABILITY_IEI,
-                                                         buffer + encoded,
-                                                         len - encoded))
+                                                         buffer + encoded))
         < 0)
       // Return in case of error
       return encode_result;
diff --git a/openair3/NAS/NR_UE/nr_nas_msg.c b/openair3/NAS/NR_UE/nr_nas_msg.c
index 7f94b2a747..e7762c0051 100644
--- a/openair3/NAS/NR_UE/nr_nas_msg.c
+++ b/openair3/NAS/NR_UE/nr_nas_msg.c
@@ -222,11 +222,10 @@ static void nas_security_compute_mac(nr_ue_nas_t *nas,
  * @brief: Decrypt the payload of a NAS message. The buffer is modified in place
  * @param[in] nas The NAS context
  * @param[in] pdu_buffer The buffer containing the full (header + payload) NAS message
- * @param[in] is_uplink True if the message is uplink, false Downlink
  * @param[in] is3gpp_access True if the message is 3GPP access, false otherwise
  * @param[in] pdu_length The length of the NAS message
  */
-static void nas_security_decrypt_payload(nr_ue_nas_t *nas, byte_array_t buffer, const bool is_uplink, const bool is3gpp_access)
+static void nas_security_decrypt_payload(nr_ue_nas_t *nas, byte_array_t buffer, const bool is3gpp_access)
 {
   Security_header_t sec_hdr;
 
@@ -380,7 +379,7 @@ static security_state_t nas_security_rx_process(nr_ue_nas_t *nas, byte_array_t b
     return NAS_SECURITY_INTEGRITY_FAILED;
 
   /* decipher */
-  nas_security_decrypt_payload(nas, buffer, false, true);
+  nas_security_decrypt_payload(nas, buffer, true);
 
   /* update estimated DL Counter */
   nas->security.nas_count_dl++;
@@ -669,7 +668,7 @@ static FGSRegistrationType set_fgs_ksi(nr_ue_nas_t *nas)
  * @brief Set contents of 5GMM capability
  * @note  Currently hardcoded, sending min length only (1 octet)
  */
-static FGMMCapability set_fgmm_capability(nr_ue_nas_t *nas)
+static FGMMCapability set_fgmm_capability()
 {
   FGMMCapability cap = {0};
   cap.iei = REGISTRATION_REQUEST_5GMM_CAPABILITY_IEI;
@@ -794,7 +793,7 @@ void generateRegistrationRequest(as_nas_info_t *initialNasMsg, nr_ue_nas_t *nas,
   if (full_rr->fgsregistrationtype != PERIODIC_REGISTRATION_UPDATING) {
     cleartext_only = false; // The UE needs to send non-cleartext IE
     full_rr->presencemask |= REGISTRATION_REQUEST_5GMM_CAPABILITY_PRESENT;
-    full_rr->fgmmcapability = set_fgmm_capability(nas);
+    full_rr->fgmmcapability = set_fgmm_capability();
     FGMMCapability *cap = &full_rr->fgmmcapability;
     size_nct += sizeof(cap->length) + sizeof(cap->iei) + cap->length;
   }
@@ -1022,7 +1021,7 @@ static void generateAuthenticationResp(nr_ue_nas_t *nas, as_nas_info_t *initialN
 
 /** @brief Send Authentication Failure message from the UE to the AMF to
  * indicate that authentication of the network has failed */
-static void generateAuthenticationFailure(nr_ue_nas_t *nas, as_nas_info_t *initialNasMsg, cause_id_t cause)
+static void generateAuthenticationFailure(as_nas_info_t *initialNasMsg, cause_id_t cause)
 {
   int size = sizeof(fgmm_msg_header_t);
   fgmm_nas_message_plain_t plain = {0};
@@ -1066,7 +1065,7 @@ static void handle_fgmm_authentication_request(nr_ue_nas_t *nas, as_nas_info_t *
     /* If the ngKSI value received is already associated with one
     of the 5G security contexts stored in the UE, send failure message */
     LOG_E(NAS, "Invalid NAS Key Set Identifier: send Authentication Failure\n");
-    generateAuthenticationFailure(nas, initialNasMsg, ngKSI_already_in_use);
+    generateAuthenticationFailure(initialNasMsg, ngKSI_already_in_use);
     return;
   }
   generateAuthenticationResp(nas, initialNasMsg, buffer->buf);
@@ -1078,7 +1077,7 @@ static void handle_fgmm_authentication_request(nr_ue_nas_t *nas, as_nas_info_t *
  * @todo The UE shall performs actions as per 5.4.1.3.5 of 3GPP TS 24.501, including
  * (1) Abort any ongoing 5GMM procedure (2) Stop all active timers: T3510, T3516, T3517,
  * T3519, T3520, T3521 (3) Delete stored SUCI. (4) handle EAP-failure message. */
-static void handle_authentication_reject(nr_ue_nas_t *nas, as_nas_info_t *initialNasMsg, uint8_t *pdu, int pdu_length)
+static void handle_authentication_reject(nr_ue_nas_t *nas, uint8_t *pdu, int pdu_length)
 {
   LOG_E(NAS, "Received Authentication Reject message from the network\n");
   uint8_t eap_msg[MAX_EAP_CONTENTS_LEN] = {0};
@@ -1574,7 +1573,7 @@ void handleDownlinkNASTransport(const nr_ue_nas_t *nas, uint8_t * pdu_buffer, in
   }
 }
 
-static void generateDeregistrationRequest(nr_ue_nas_t *nas, as_nas_info_t *initialNasMsg, const nas_deregistration_req_t *req)
+static void generateDeregistrationRequest(nr_ue_nas_t *nas, as_nas_info_t *initialNasMsg)
 {
   fgmm_nas_msg_security_protected_t sp_msg = {0};
   fgs_nas_message_security_header_t *sp_header = &sp_msg.header;
@@ -1802,6 +1801,7 @@ static int get_user_nssai_idx(nssai_t ch_nssai, const nr_nas_msg_snssai_t allowe
 
 void *nas_nrue_task(void *args_p)
 {
+  UNUSED(args_p);
   while (1) {
     nas_nrue(NULL);
   }
@@ -1942,6 +1942,7 @@ static void handle_service_reject(nr_ue_nas_t *nas, const byte_array_t *buffer)
 
 void *nas_nrue(void *args_p)
 {
+  UNUSED(args_p);
   // Wait for a message or an event
   MessageDef *msg_p;
   itti_receive_msg(TASK_NAS_NRUE, &msg_p);
@@ -2072,7 +2073,7 @@ void *nas_nrue(void *args_p)
             send_nas_detach_req(nas, true);
           }
           as_nas_info_t initialNasMsg = {0};
-          generateDeregistrationRequest(nas, &initialNasMsg, req);
+          generateDeregistrationRequest(nas, &initialNasMsg);
           send_nas_uplink_data_req(nas, &initialNasMsg);
         } else {
           LOG_W(NAS, "No GUTI, cannot trigger deregistration request.\n");
@@ -2108,7 +2109,7 @@ void *nas_nrue(void *args_p)
             handle_fgmm_authentication_request(nas, &initialNasMsg, &buffer);
             break;
           case FGS_AUTHENTICATION_REJECT:
-            handle_authentication_reject(nas, &initialNasMsg, pdu_buffer, pdu_length);
+            handle_authentication_reject(nas, pdu_buffer, pdu_length);
             break;
           case FGS_SECURITY_MODE_COMMAND:
             handle_security_mode_command(nas, &initialNasMsg, pdu_buffer, pdu_length);
diff --git a/openair3/NAS/UE/API/USIM/usim_api.c b/openair3/NAS/UE/API/USIM/usim_api.c
index 6151eef11f..9e801781aa 100644
--- a/openair3/NAS/UE/API/USIM/usim_api.c
+++ b/openair3/NAS/UE/API/USIM/usim_api.c
@@ -455,6 +455,8 @@ int usim_api_authenticate(usim_data_t *usim_data, const OctetString* rand_pP, co
 static int _usim_api_check_sqn(uint32_t seq, uint8_t ind)
 {
   /* TODO */
+  UNUSED(seq);
+  UNUSED(ind);
   return (RETURNok);
 }