diff --git a/nfapi/README.md b/nfapi/README.md
index f43d67b618..b086cabf04 100644
--- a/nfapi/README.md
+++ b/nfapi/README.md
@@ -31,4 +31,8 @@
 ### 19/06/20
 * `ret = openair0_device_load(&ru->rfdevice,&ru->openair0_cfg);` sloc: 1428 in `nr-ru.c`
 * the `ru->rfdevice` has all members zero or null.
-* This issue was solved by adding `sdr_addrs` to config file of PNF.
\ No newline at end of file
+* This issue was solved by adding `sdr_addrs` to config file of PNF.
+
+* `if (cfg->tdd_table.max_tdd_periodicity_list[nr_tti].max_num_of_symbol_per_slot_list[symbol_count].slot_config.value==1`
+    * throws segmentation error
+    * `max_tdd_periodicity_list` is not assigned memory
diff --git a/nfapi/oai_integration/nfapi_pnf.c b/nfapi/oai_integration/nfapi_pnf.c
index 5ebd4936b9..f5ff8936b2 100644
--- a/nfapi/oai_integration/nfapi_pnf.c
+++ b/nfapi/oai_integration/nfapi_pnf.c
@@ -419,7 +419,7 @@ int pnf_config_request(nfapi_pnf_config_t *config, nfapi_pnf_config_request_t *r
 
 void nfapi_send_pnf_start_resp(nfapi_pnf_config_t *config, uint16_t phy_id) {
   printf("Sending NFAPI_START_RESPONSE config:%p phy_id:%d\n", config, phy_id);
-  nfapi_start_response_t start_resp;
+  nfapi_nr_start_response_scf_t start_resp;
   memset(&start_resp, 0, sizeof(start_resp));
   start_resp.header.message_id = NFAPI_START_RESPONSE;
   start_resp.header.phy_id = phy_id;
diff --git a/nfapi/oai_integration/nfapi_vnf.c b/nfapi/oai_integration/nfapi_vnf.c
index 2021876638..cf7597b59a 100644
--- a/nfapi/oai_integration/nfapi_vnf.c
+++ b/nfapi/oai_integration/nfapi_vnf.c
@@ -1017,14 +1017,6 @@ extern uint32_t to_earfcn(int eutra_bandP,uint32_t dl_CarrierFreq,uint32_t bw);
 
 int param_resp_cb(nfapi_vnf_config_t *config, int p5_idx, nfapi_nr_param_response_scf_t *resp) {
 
-#ifdef TEST
-  if(resp->cell_param.phy_state.tl.tag == NFAPI_NR_PARAM_TLV_PHY_STATE_TAG)
-    printf("\n\nMatched\n\n");
-  // like this we can check for all the tags
-#endif
-
-
-
   printf("[VNF] Received NFAPI_PARAM_RESP idx:%d phy_id:%d\n", p5_idx, resp->header.phy_id);
   vnf_info *vnf = (vnf_info *)(config->user_data);
   vnf_p7_info *p7_vnf = vnf->p7_vnfs;
@@ -1093,7 +1085,7 @@ int config_resp_cb(nfapi_vnf_config_t *config, int p5_idx, nfapi_nr_config_respo
   return 0;
 }
 
-int start_resp_cb(nfapi_vnf_config_t *config, int p5_idx, nfapi_start_response_t *resp) {
+int start_resp_cb(nfapi_vnf_config_t *config, int p5_idx, nfapi_nr_start_response_scf_t *resp) {
   printf("[VNF] Received NFAPI_START_RESP idx:%d phy_id:%d\n", p5_idx, resp->header.phy_id);
   vnf_info *vnf = (vnf_info *)(config->user_data);
   pnf_info *pnf = vnf->pnfs;
diff --git a/nfapi/open-nFAPI/nfapi/public_inc/nfapi_nr_interface_scf b/nfapi/open-nFAPI/nfapi/public_inc/nfapi_nr_interface_scf
new file mode 100644
index 0000000000..6ee4ec8404
Binary files /dev/null and b/nfapi/open-nFAPI/nfapi/public_inc/nfapi_nr_interface_scf differ
diff --git a/nfapi/open-nFAPI/nfapi/public_inc/nfapi_nr_interface_scf.h b/nfapi/open-nFAPI/nfapi/public_inc/nfapi_nr_interface_scf.h
index 72f7ff91ec..29fb8ac09e 100644
--- a/nfapi/open-nFAPI/nfapi/public_inc/nfapi_nr_interface_scf.h
+++ b/nfapi/open-nFAPI/nfapi/public_inc/nfapi_nr_interface_scf.h
@@ -85,11 +85,6 @@ typedef struct {
 	nfapi_vendor_extension_tlv_t vendor_extension;
 } nfapi_nr_param_request_t;
 
-typedef enum {
-  NFAPI_NR_PARAM_MSG_OK = 0, 
-	NFAPI_NR_PARAM_MSG_INVALID_STATE
-
-} nfapi_nr_param_errors_e;
 
 /*typedef struct {
   nfapi_nr_param_errors_e error_code;
@@ -263,12 +258,6 @@ typedef struct
 //-------------------------------------------//
 //3.3.2 CONFIG
 
-
-typedef enum {
-  NFAPI_NR_CONFIG_MSG_OK = 0,
-  NFAPI_NR_CONFIG_MSG_INVALID_CONFIG  //The configuration provided has missing mandatory TLVs, or TLVs that are invalid or unsupported in this state.
-} nfapi_nr_config_errors_e;
-
 /*typedef struct {
 	nfapi_nr_config_errors_e error_code;
   uint8_t number_of_invalid_tlvs_that_can_only_be_configured_in_idle;
@@ -448,6 +437,25 @@ typedef struct
 
 } nfapi_nr_measurement_config_t;
 
+// ERROR enums
+typedef enum {    // Table 2-22
+  NFAPI_NR_PARAM_MSG_OK = 0, 
+	NFAPI_NR_PARAM_MSG_INVALID_STATE
+} nfapi_nr_param_errors_e;
+
+typedef enum {    // Table 2-25
+  NFAPI_NR_CONFIG_MSG_OK = 0,
+  NFAPI_NR_CONFIG_MSG_INVALID_STATE, //The CONFIG.request was received when the PHY was not in the IDLE state or the CONFIGURED state.
+  NFAPI_NR_CONFIG_MSG_INVALID_CONFIG  //The configuration provided has missing mandatory TLVs, or TLVs that are invalid or unsupported in this state.
+} nfapi_nr_config_errors_e;
+
+typedef enum {    // Table 2-27
+  NFAPI_NR_START_MSG_OK = 0,       
+	NFAPI_NR_START_MSG_INVALID_STATE
+} nfapi_nr_start_errors_e;
+
+
+
 /* PARAM.REQUEST */
 typedef struct {
   nfapi_p4_p5_message_header_t  header;
@@ -479,7 +487,7 @@ typedef struct {
 /* CONFIG.REQUEST */
 typedef struct {
   nfapi_p4_p5_message_header_t  header;
-  nfapi_nr_param_errors_e       error_code;
+  nfapi_nr_param_errors_e       error_code; // TODO: check if needed
 
   uint8_t                       num_tlv;
   nfapi_vendor_extension_tlv_t  vendor_extension;
@@ -497,10 +505,9 @@ typedef struct {
 
 /* CONFIG.RESPONSE */
 typedef struct {
-  // TODO: add here
   nfapi_p4_p5_message_header_t  header;
-  nfapi_nr_param_errors_e error_code;
-  uint8_t num_invalid_tlvs;
+  nfapi_nr_config_errors_e error_code;
+  //uint8_t num_invalid_tlvs;
   // TODO: add list of invalid/unsupported TLVs (see Table 3.18)
    nfapi_vendor_extension_tlv_t  vendor_extension;
 } nfapi_nr_config_response_scf_t;
@@ -513,9 +520,11 @@ typedef struct {
 	nfapi_vendor_extension_tlv_t vendor_extension;
 } nfapi_nr_start_request_scf_t;
 
-typedef enum {
-	NFAPI_NR_START_MSG_INVALID_STATE
-} nfapi_nr_start_errors_e;
+typedef struct {
+  nfapi_p4_p5_message_header_t header;
+  nfapi_nr_start_errors_e error_code;
+  nfapi_vendor_extension_tlv_t vendor_extension;
+} nfapi_nr_start_response_scf_t;
 
 //3.3.4 STOP
 
@@ -524,6 +533,7 @@ typedef struct {
 	nfapi_vendor_extension_tlv_t vendor_extension;
 } nfapi_nr_stop_request_t;
 
+
 typedef struct {
 	nfapi_p4_p5_message_header_t header;
 	nfapi_vendor_extension_tlv_t vendor_extension;
diff --git a/nfapi/open-nFAPI/nfapi/src/nfapi_p5.c b/nfapi/open-nFAPI/nfapi/src/nfapi_p5.c
index fb92beca0a..7293477601 100644
--- a/nfapi/open-nFAPI/nfapi/src/nfapi_p5.c
+++ b/nfapi/open-nFAPI/nfapi/src/nfapi_p5.c
@@ -871,7 +871,7 @@ static uint8_t pack_start_request(void *msg, uint8_t **ppWritePackedMsg, uint8_t
 
 static uint8_t pack_start_response(void *msg, uint8_t **ppWritePackedMsg, uint8_t *end, nfapi_p4_p5_codec_config_t* config)
 {
-	nfapi_start_response_t *pNfapiMsg = (nfapi_start_response_t*)msg;
+	nfapi_nr_start_response_scf_t *pNfapiMsg = (nfapi_nr_start_response_scf_t*)msg;
 
 	return ( push32(pNfapiMsg->error_code, ppWritePackedMsg, end ) &&
 			 pack_vendor_extension_tlv(pNfapiMsg->vendor_extension, ppWritePackedMsg, end, config) );
@@ -1809,7 +1809,7 @@ static uint8_t unpack_start_request(uint8_t **ppReadPackedMsg, uint8_t *end, voi
 
 static uint8_t unpack_start_response(uint8_t **ppReadPackedMsg, uint8_t *end, void *msg, nfapi_p4_p5_codec_config_t* config)
 {
-	nfapi_start_response_t *pNfapiMsg = (nfapi_start_response_t*)msg;
+	nfapi_nr_start_response_scf_t *pNfapiMsg = (nfapi_nr_start_response_scf_t*)msg;
 
 	unpack_tlv_t unpack_fns[] =
 	{
@@ -1957,8 +1957,8 @@ static int check_unpack_length(nfapi_message_id_e msgId, uint32_t unpackedBufLen
 			break;
 
 		case NFAPI_START_RESPONSE:
-			if (unpackedBufLen >= sizeof(nfapi_start_response_t))
-				retLen = sizeof(nfapi_start_response_t);
+			if (unpackedBufLen >= sizeof(nfapi_nr_start_response_scf_t))
+				retLen = sizeof(nfapi_nr_start_response_scf_t);
 			break;
 
 		case NFAPI_STOP_REQUEST:
diff --git a/nfapi/open-nFAPI/pnf/public_inc/nfapi_pnf_interface.h b/nfapi/open-nFAPI/pnf/public_inc/nfapi_pnf_interface.h
index 008d11c996..cb98ad2905 100644
--- a/nfapi/open-nFAPI/pnf/public_inc/nfapi_pnf_interface.h
+++ b/nfapi/open-nFAPI/pnf/public_inc/nfapi_pnf_interface.h
@@ -421,7 +421,7 @@ int nfapi_pnf_config_resp(nfapi_pnf_config_t* config, nfapi_nr_config_response_s
  * \return 0 for success, -1 for failure
  * 
  */
-int nfapi_pnf_start_resp(nfapi_pnf_config_t* config, nfapi_start_response_t* resp);
+int nfapi_pnf_start_resp(nfapi_pnf_config_t* config, nfapi_nr_start_response_scf_t* resp);
 
 /*! Send the STOP.response
  * \param config A pointer to a pnf configuraiton
diff --git a/nfapi/open-nFAPI/pnf/src/pnf_interface.c b/nfapi/open-nFAPI/pnf/src/pnf_interface.c
index 4b8a154f1f..46be810a4f 100644
--- a/nfapi/open-nFAPI/pnf/src/pnf_interface.c
+++ b/nfapi/open-nFAPI/pnf/src/pnf_interface.c
@@ -210,7 +210,7 @@ int nfapi_pnf_config_resp(nfapi_pnf_config_t* config, nfapi_nr_config_response_s
 	return pnf_pack_and_send_p5_message(_this, &(resp->header), sizeof(nfapi_nr_config_response_scf_t));
 }
 
-int nfapi_pnf_start_resp(nfapi_pnf_config_t* config, nfapi_start_response_t* resp)
+int nfapi_pnf_start_resp(nfapi_pnf_config_t* config, nfapi_nr_start_response_scf_t* resp)
 {
 	if (config == NULL || resp == NULL)
 	{
@@ -234,7 +234,7 @@ int nfapi_pnf_start_resp(nfapi_pnf_config_t* config, nfapi_start_response_t* res
 		return -1;
 	}
 
-	return pnf_pack_and_send_p5_message(_this, &(resp->header), sizeof(nfapi_start_response_t));
+	return pnf_pack_and_send_p5_message(_this, &(resp->header), sizeof(nfapi_nr_start_response_scf_t));
 }
 
 int nfapi_pnf_stop_resp(nfapi_pnf_config_t* config, nfapi_stop_response_t* resp)
diff --git a/nfapi/open-nFAPI/vnf/public_inc/nfapi_vnf_interface.h b/nfapi/open-nFAPI/vnf/public_inc/nfapi_vnf_interface.h
index 5091eb5d5b..d3b8db2be4 100644
--- a/nfapi/open-nFAPI/vnf/public_inc/nfapi_vnf_interface.h
+++ b/nfapi/open-nFAPI/vnf/public_inc/nfapi_vnf_interface.h
@@ -286,7 +286,7 @@ typedef struct nfapi_vnf_config
 	 *  then the substructure pointers should be set to 0 and then the client should
 	 *  use the codec_config.deallocate function to release it at a future point
 	 */
-	int (*start_resp)(nfapi_vnf_config_t* config, int p5_idx, nfapi_start_response_t* resp);
+	int (*start_resp)(nfapi_vnf_config_t* config, int p5_idx, nfapi_nr_start_response_scf_t* resp);
 	
 	/*! A callback for the STOP.resp
      *  \param config A pointer to the vnf configuration
diff --git a/nfapi/open-nFAPI/vnf/src/vnf.c b/nfapi/open-nFAPI/vnf/src/vnf.c
index 28f469b71d..a5998c9266 100644
--- a/nfapi/open-nFAPI/vnf/src/vnf.c
+++ b/nfapi/open-nFAPI/vnf/src/vnf.c
@@ -302,6 +302,7 @@ void vnf_handle_param_response(void *pRecvMsg, int recvMsgLen, nfapi_vnf_config_
 
 void vnf_handle_config_response(void *pRecvMsg, int recvMsgLen, nfapi_vnf_config_t* config, int p5_idx)
 {
+
 	// ensure it's valid
 	if (pRecvMsg == NULL || config == NULL)
 	{
@@ -316,9 +317,13 @@ void vnf_handle_config_response(void *pRecvMsg, int recvMsgLen, nfapi_vnf_config
 		// unpack the message
 		if (nfapi_p5_message_unpack(pRecvMsg, recvMsgLen, &msg, sizeof(msg), &config->codec_config) >=0 )
 		{
-			if(config->config_resp)
-			{
-				(config->config_resp)(config, p5_idx, &msg);
+			// check the error code:
+
+			if (msg.error_code == NFAPI_MSG_OK){
+				if(config->config_resp)
+				{
+					(config->config_resp)(config, p5_idx, &msg);
+				}
 			}
 		}
 		else
@@ -343,14 +348,16 @@ void vnf_handle_start_response(void *pRecvMsg, int recvMsgLen, nfapi_vnf_config_
 	{	
 		NFAPI_TRACE(NFAPI_TRACE_INFO, "Received START_RESPONSE\n");
 
-		nfapi_start_response_t msg;
+		nfapi_nr_start_response_scf_t msg;
 		
 		// unpack the message
 		if (nfapi_p5_message_unpack(pRecvMsg, recvMsgLen, &msg, sizeof(msg), &config->codec_config) >= 0)
-		{
-			if(config->start_resp)
-			{
-				(config->start_resp)(config, p5_idx, &msg);
+		{	// check the error code
+			if (msg.error_code == NFAPI_MSG_OK){
+				if(config->start_resp)
+				{
+					(config->start_resp)(config, p5_idx, &msg);
+				}
 			}
 		}
 		else
diff --git a/openair1/SCHED_NR/phy_frame_config_nr.c b/openair1/SCHED_NR/phy_frame_config_nr.c
index a36cebd6ae..efbcd805ce 100644
--- a/openair1/SCHED_NR/phy_frame_config_nr.c
+++ b/openair1/SCHED_NR/phy_frame_config_nr.c
@@ -311,7 +311,7 @@ int set_tdd_configuration_dedicated_nr(NR_DL_FRAME_PARMS *frame_parms) {
 *********************************************************************/
 
 int nr_slot_select(nfapi_nr_config_request_scf_t *cfg, int nr_frame, int nr_tti) {
-  /* for FFD all slot can be considered as an uplink */
+  /* for FDD all slot can be considered as an uplink */
   int mu = cfg->ssb_config.scs_common.value,check_slot=0;
 
   if (cfg->cell_config.frame_duplex_type.value == FDD) {