diff --git a/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.h b/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.h
index 4acf7368b5..b757620506 100644
--- a/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.h
+++ b/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.h
@@ -151,6 +151,8 @@ static const text_info_t sa_iei_s[] = {FOREACH_SA_IEI(TO_TEXT)};
 
 typedef enum { FOREACH_CAUSE(TO_ENUM) } cause_id_t;
 
+static const text_info_t fgmm_cause_s[] = {FOREACH_CAUSE(TO_TEXT)};
+
 /* 10.5.7.3 3GPP TS 24.008 */
 typedef struct {
   uint8_t value;
diff --git a/openair3/NAS/NR_UE/nr_nas_msg.c b/openair3/NAS/NR_UE/nr_nas_msg.c
index b9b90ab339..941e0d7cdc 100644
--- a/openair3/NAS/NR_UE/nr_nas_msg.c
+++ b/openair3/NAS/NR_UE/nr_nas_msg.c
@@ -66,6 +66,7 @@
 #include "openair2/SDAP/nr_sdap/nr_sdap.h"
 #include "fgs_nas_utils.h"
 #include "fgmm_service_accept.h"
+#include "fgmm_service_reject.h"
 
 #define MAX_NAS_UE 4
 
@@ -1531,6 +1532,17 @@ static void handle_service_accept(nr_ue_nas_t *nas, const byte_array_t *buffer)
           print_info(msg.cause->cause, cause_text_info, sizeofArray(cause_text_info)));
 }
 
+static void handle_service_reject(nr_ue_nas_t *nas, const byte_array_t *buffer)
+{
+  fgs_service_reject_msg_t msg = {0};
+  decode_fgs_service_reject(&msg, buffer);
+  // Extract timer t3448 in seconds (optional IE)
+  nas->t3448 = process_gprs_timer(msg.t3448);
+  // Extract timer t3446 in seconds (optional IE)
+  nas->t3446 = process_gprs_timer(msg.t3446);
+  LOG_E(NAS, "Received NAS Service Reject message with cause %s\n", fgmm_cause_s[msg.cause].text);
+}
+
 void *nas_nrue(void *args_p)
 {
   // Wait for a message or an event
@@ -1737,6 +1749,13 @@ void *nas_nrue(void *args_p)
             handle_service_accept(nas, &buffer);
             break;
           }
+
+          case FGS_SERVICE_REJECT: {
+            byte_array_t buffer = {.buf = pdu_buffer, .len = pdu_length};
+            handle_service_reject(nas, &buffer);
+            break;
+          }
+
           default:
             LOG_W(NR_RRC, "unknown message type %d\n", msg_type);
             break;
diff --git a/openair3/NAS/NR_UE/nr_nas_msg.h b/openair3/NAS/NR_UE/nr_nas_msg.h
index 3bba6b1cec..c4f1d04e28 100644
--- a/openair3/NAS/NR_UE/nr_nas_msg.h
+++ b/openair3/NAS/NR_UE/nr_nas_msg.h
@@ -100,6 +100,8 @@ typedef struct {
   int t3512;
   // Timer t3448 in seconds (-1 = disabled)
   int t3448;
+  // Timer t3446 in seconds (-1 = disabled)
+  int t3446;
 } nr_ue_nas_t;
 
 nr_ue_nas_t *get_ue_nas_info(module_id_t module_id);