diff --git a/openair2/F1AP/f1ap_du_rrc_message_transfer.c b/openair2/F1AP/f1ap_du_rrc_message_transfer.c
index 5fc8daef3f..c701efe36c 100644
--- a/openair2/F1AP/f1ap_du_rrc_message_transfer.c
+++ b/openair2/F1AP/f1ap_du_rrc_message_transfer.c
@@ -140,7 +140,7 @@ int DU_handle_DL_RRC_MESSAGE_TRANSFER(instance_t       instance,
     .rnti = f1ap_get_rnti_by_du_id(DUtype, instance, du_ue_f1ap_id),
     .srb_id = srb_id
   };
-  dl_rrc_message(instance, &dl_rrc);
+  dl_rrc_message_transfer(&dl_rrc);
   return 0;
 }
 
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 6959be3677..108c909c06 100644
--- a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.c
+++ b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.c
@@ -268,10 +268,10 @@ void ue_context_release_command(const f1ap_ue_context_release_cmd_t *cmd)
   mac->mac_rrc.ue_context_release_complete(&complete);
 }
 
-int dl_rrc_message(module_id_t module_id, const f1ap_dl_rrc_message_t *dl_rrc)
+void dl_rrc_message_transfer(const f1ap_dl_rrc_message_t *dl_rrc)
 {
   LOG_D(NR_MAC, "DL RRC Message Transfer with %d bytes for RNTI %04x SRB %d\n", dl_rrc->rrc_container_length, dl_rrc->rnti, dl_rrc->srb_id);
 
+  /* the DU ue id is the RNTI */
   nr_rlc_srb_recv_sdu(dl_rrc->rnti, dl_rrc->srb_id, dl_rrc->rrc_container, dl_rrc->rrc_container_length);
-  return 0;
 }
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 808277a7f4..859e128b4a 100644
--- a/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.h
+++ b/openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.h
@@ -29,6 +29,6 @@ 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_release_command(const f1ap_ue_context_release_cmd_t *cmd);
 
-int dl_rrc_message(module_id_t module_id, const f1ap_dl_rrc_message_t *dl_rrc);
+void dl_rrc_message_transfer(const f1ap_dl_rrc_message_t *dl_rrc);
 
 #endif /* MAC_RRC_DL_HANDLER_H */
diff --git a/openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c b/openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c
index 7a798d7b81..f7fa3f1f78 100644
--- a/openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c
+++ b/openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c
@@ -750,7 +750,7 @@ void deliver_pdu_srb_f1(void *deliver_pdu_data, ue_id_t ue_id, int srb_id,
                                   .rrc_container_length = size,
                                   .rnti = ue_id,
                                   .srb_id = srb_id};
-  rrc->mac_rrc.dl_rrc_message_transfer(0, &dl_rrc);
+  rrc->mac_rrc.dl_rrc_message_transfer(&dl_rrc);
 }
 
 static void add_srb(int is_gnb, ue_id_t rntiMaybeUEid, struct NR_SRB_ToAddMod *s, int ciphering_algorithm, int integrity_algorithm, unsigned char *ciphering_key, unsigned char *integrity_key)
diff --git a/openair2/RRC/NR/mac_rrc_dl.h b/openair2/RRC/NR/mac_rrc_dl.h
index 2728174603..94920f6f64 100644
--- a/openair2/RRC/NR/mac_rrc_dl.h
+++ b/openair2/RRC/NR/mac_rrc_dl.h
@@ -29,7 +29,7 @@ typedef void (*ue_context_setup_request_func_t)(const f1ap_ue_context_setup_t *r
 typedef void (*ue_context_modification_request_func_t)(const f1ap_ue_context_modif_req_t *req);
 typedef void (*ue_context_release_command_func_t)(const f1ap_ue_context_release_cmd_t *cmd);
 
-typedef void (*dl_rrc_message_transfer_func_t)(module_id_t module_id, const f1ap_dl_rrc_message_t *dl_rrc);
+typedef void (*dl_rrc_message_transfer_func_t)(const f1ap_dl_rrc_message_t *dl_rrc);
 
 struct nr_mac_rrc_dl_if_s;
 void mac_rrc_dl_direct_init(struct nr_mac_rrc_dl_if_s *mac_rrc);
diff --git a/openair2/RRC/NR/mac_rrc_dl_direct.c b/openair2/RRC/NR/mac_rrc_dl_direct.c
index 2d436c19e3..eeec72e132 100644
--- a/openair2/RRC/NR/mac_rrc_dl_direct.c
+++ b/openair2/RRC/NR/mac_rrc_dl_direct.c
@@ -24,17 +24,10 @@
 #include "mac_rrc_dl.h"
 #include "openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.h"
 
-static void dl_rrc_message_transfer_direct(module_id_t module_id, const f1ap_dl_rrc_message_t *dl_rrc)
-{
-  /* TODO how to manage inter-thread communication? */
-
-  dl_rrc_message(module_id, dl_rrc);
-}
-
 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_release_command = ue_context_release_command;
-  mac_rrc->dl_rrc_message_transfer = dl_rrc_message_transfer_direct;
+  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 21c8ff9500..0aa9dbac35 100644
--- a/openair2/RRC/NR/mac_rrc_dl_f1ap.c
+++ b/openair2/RRC/NR/mac_rrc_dl_f1ap.c
@@ -85,7 +85,7 @@ static void ue_context_release_command_f1ap(const f1ap_ue_context_release_cmd_t
   itti_send_msg_to_task (TASK_CU_F1, 0, message_p);
 }
 
-static void dl_rrc_message_transfer_f1ap(module_id_t module_id, const f1ap_dl_rrc_message_t *dl_rrc)
+static void dl_rrc_message_transfer_f1ap(const f1ap_dl_rrc_message_t *dl_rrc)
 {
   /* TODO call F1AP function directly? no real-time constraint here */
 
@@ -98,7 +98,7 @@ static void dl_rrc_message_transfer_f1ap(module_id_t module_id, const f1ap_dl_rr
     msg->rrc_container_length = dl_rrc->rrc_container_length;
     memcpy(msg->rrc_container, dl_rrc->rrc_container, dl_rrc->rrc_container_length);
   }
-  itti_send_msg_to_task (TASK_CU_F1, module_id, message_p);
+  itti_send_msg_to_task (TASK_CU_F1, 0, message_p);
 }
 
 void mac_rrc_dl_f1ap_init(nr_mac_rrc_dl_if_t *mac_rrc)
diff --git a/openair2/RRC/NR/rrc_gNB.c b/openair2/RRC/NR/rrc_gNB.c
index f731ed0fbe..47ae15042c 100644
--- a/openair2/RRC/NR/rrc_gNB.c
+++ b/openair2/RRC/NR/rrc_gNB.c
@@ -476,7 +476,7 @@ static void rrc_gNB_generate_RRCSetup(instance_t instance,
     .rnti = ue_p->rnti,
     .srb_id = CCCH
   };
-  rrc->mac_rrc.dl_rrc_message_transfer(instance, &dl_rrc);
+  rrc->mac_rrc.dl_rrc_message_transfer(&dl_rrc);
 }
 
 //-----------------------------------------------------------------------------
@@ -532,7 +532,7 @@ static int rrc_gNB_generate_RRCSetup_for_RRCReestablishmentRequest(module_id_t m
     .rnti = ue_p->rnti,
     .srb_id = CCCH
   };
-  rrc_instance_p->mac_rrc.dl_rrc_message_transfer(module_id, &dl_rrc);
+  rrc_instance_p->mac_rrc.dl_rrc_message_transfer(&dl_rrc);
   return xid;
 }
 
@@ -565,7 +565,7 @@ static void rrc_gNB_generate_RRCReject(module_id_t module_id, rrc_gNB_ue_context
     .execute_duplication  = 1,
     .RAT_frequency_priority_information.en_dc = 0
   };
-  rrc->mac_rrc.dl_rrc_message_transfer(module_id, &dl_rrc);
+  rrc->mac_rrc.dl_rrc_message_transfer(&dl_rrc);
 }
 
 //-----------------------------------------------------------------------------