diff --git a/include/param/param.h b/include/param/param.h
index dfc872f..4b31782 100644
--- a/include/param/param.h
+++ b/include/param/param.h
@@ -86,6 +86,12 @@ typedef enum {
 #define PM_CSP               (5 << 16) //! Known as 5 in elfparse and genparamtable
 #define PM_KEYCONF               (6 << 16) //! Known as 6 in elfparse and genparamtable
 
+/**
+ * Value to indicate an invalid nsec.
+ *
+ * This define should be moved to CSP if CSP will have support for invalid nsec
+ */
+#define CSP_TIMESTAMP_INVALID_NSEC	-1
 
 /**
  * Parameter description structure
@@ -140,7 +146,7 @@ typedef struct param_s {
 
 #ifdef PARAM_HAVE_TIMESTAMP
 #define PARAM_TIMESTAMP_DECL(_name) \
-    csp_timestamp_t _timestamp_##_name = { .tv_sec = 0, .tv_nsec = 0 };
+    csp_timestamp_t _timestamp_##_name = { .tv_sec = 0, .tv_nsec = CSP_TIMESTAMP_INVALID_NSEC };
 
 #define PARAM_TIMESTAMP_INIT(_name) \
     .timestamp = &_timestamp_##_name,
diff --git a/include/param/param_client.h b/include/param/param_client.h
index ada01fa..025d1f8 100644
--- a/include/param/param_client.h
+++ b/include/param/param_client.h
@@ -50,6 +50,20 @@ int param_pull_single(param_t *param, int offset, int prio, int verbose, int hos
  */
 int param_pull_all(int prio, int verbose, int host, uint32_t include_mask, uint32_t exclude_mask, int timeout, int version);
 
+/**
+ * PULL all and set param queue initial timestamp
+ * @param prio          CSP packet priority
+ * @param verbose       printout when received
+ * @param host          remote csp node
+ * @param include_mask  parameter mask
+ * @param exclude_mask  parameter mask
+ * @param timeout       in ms
+ * @param version       1 or 2
+ * @param timestamp     if not NULL set param queue initial timestamp to this timestamp
+ * @return              0 = OK, -1 on network error
+ */
+int param_pull_all_timestamp(int prio, int verbose, int host, uint32_t include_mask, uint32_t exclude_mask, int timeout, int version, csp_timestamp_t *timestamp);
+
 /**
  * PUSH single:
  *
diff --git a/include/param/param_queue.h b/include/param/param_queue.h
index 0fc4be9..74ecfda 100644
--- a/include/param/param_queue.h
+++ b/include/param/param_queue.h
@@ -48,6 +48,16 @@ int param_queue_add(param_queue_t *queue, param_t *param, int offset, void *valu
  */
 int param_queue_apply(param_queue_t *queue, int host, int verbose);
 
+/**
+ * @brief 						Applies the content of a queue to memory and set param queue initial timestamp to the provided timestamp.
+ * @param queue[in]				Pointer to queue
+ * @param host[in]              If host is set and the node is 0, it will be set to host
+ * @param verbose[in]           2 prints if packet parse fails, 3 prints each missing param
+ * @param q_timestamp[in]       if not NULL set param queue initial timestamp to this timestamp
+ * @return 						0 OK, -1 ERROR
+ */
+int param_queue_apply_timestamp(param_queue_t *queue, int host, int verbose, const csp_timestamp_t *q_timestamp);
+
 void param_queue_print(param_queue_t *queue);
 void param_queue_print_local(param_queue_t *queue);
 void param_queue_print_params(param_queue_t *queue, uint32_t ref_timestamp);
diff --git a/meson.build b/meson.build
index 320bb9d..588bd48 100644
--- a/meson.build
+++ b/meson.build
@@ -24,6 +24,10 @@ if get_option('have_float') == false
 	conf.set('MPACK_FLOAT', 0)
 endif
 
+if get_option('serialize_extended_timestamp') == true
+	conf.set('EXTENDED_TIMESTAMP', 0)
+endif
+
 if get_option('have_fopen') == true
 	if get_option('list_dynamic') == true
 		conf.set('MPACK_STDIO', 1)
diff --git a/meson_options.txt b/meson_options.txt
index a1c5765..ff408a3 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -6,4 +6,6 @@ option('list_dynamic', type: 'boolean', value: false, description: 'Compile supp
 option('list_pool', type: 'integer', value: 0, description: 'Compile support for pre-allocated param list (requres sys/queue.h)')
 option('have_float', type: 'boolean', value: true, description: 'Support float/double')
 option('num_publishqueues', type: 'integer', value: 0, description: 'Number of param publish queues required')
+option('serialize_extended_timestamp', type: 'boolean', value: false, description: 'Include ns part of timestamps when serializing parameters (network incompatible with libparam older than June 2025')
 option('test', type: 'boolean', value: false, description: 'Build GoogleTest based tests (requires gtest)')
+
diff --git a/src/param/param_client.c b/src/param/param_client.c
index c488169..8d68bfa 100644
--- a/src/param/param_client.c
+++ b/src/param/param_client.c
@@ -26,7 +26,7 @@ static void param_transaction_callback_pull(csp_packet_t *response, int verbose,
 	param_queue_init(&queue, &response->data[2], response->length - 2, response->length - 2, PARAM_QUEUE_TYPE_SET, version);
 
 	/* Write data to local memory */
-	param_queue_apply(&queue, response->id.src, verbose);
+	param_queue_apply_timestamp(&queue, response->id.src, verbose, context);
 
 	if (!verbose) {
 		csp_buffer_free(response);
@@ -120,7 +120,7 @@ int param_transaction(csp_packet_t *packet, int host, int timeout, param_transac
 	return result;
 }
 
-int param_pull_all(int prio, int verbose, int host, uint32_t include_mask, uint32_t exclude_mask, int timeout, int version) {
+int param_pull_all_timestamp(int prio, int verbose, int host, uint32_t include_mask, uint32_t exclude_mask, int timeout, int version, csp_timestamp_t *timestamp) {
 
 	csp_packet_t *packet = csp_buffer_get(PARAM_SERVER_MTU);
 	if (packet == NULL)
@@ -135,8 +135,12 @@ int param_pull_all(int prio, int verbose, int host, uint32_t include_mask, uint3
 	packet->data32[2] = htobe32(exclude_mask);
 	packet->length = 12;
 	packet->id.pri = prio;
-	return param_transaction(packet, host, timeout, param_transaction_callback_pull, verbose, version, NULL);
+	return param_transaction(packet, host, timeout, param_transaction_callback_pull, verbose, version, timestamp);
+}
+
+int param_pull_all(int prio, int verbose, int host, uint32_t include_mask, uint32_t exclude_mask, int timeout, int version) {
 
+	return param_pull_all_timestamp(prio, verbose, host, include_mask, exclude_mask, timeout, version, NULL);
 }
 
 int param_pull_queue(param_queue_t *queue, uint8_t prio, int verbose, int host, int timeout) {
diff --git a/src/param/param_queue.c b/src/param/param_queue.c
index f4c5158..3d40230 100644
--- a/src/param/param_queue.c
+++ b/src/param/param_queue.c
@@ -67,14 +67,20 @@ int param_queue_add(param_queue_t *queue, param_t *param, int offset, void *valu
 	return 0;
 }
 
-int param_queue_apply(param_queue_t *queue, int host, int verbose) {
+int param_queue_apply_timestamp(param_queue_t *queue, int host, int verbose, const csp_timestamp_t *q_timestamp) {
+
 	int return_code = 0;
 	int atomic_write = 0;
+	csp_timestamp_t time;
+
+	if (q_timestamp == NULL) {
+		csp_clock_get_time(&time);
+	} else {
+		time = *q_timestamp;
+	}
 
-	csp_timestamp_t time_now;
-	csp_clock_get_time(&time_now);
-	queue->last_timestamp = time_now;
-	queue->client_timestamp = time_now;
+	queue->last_timestamp = time;
+	queue->client_timestamp = time;
 
 	mpack_reader_t reader;
 	mpack_reader_init_data(&reader, queue->buffer, queue->used);
@@ -98,13 +104,12 @@ int param_queue_apply(param_queue_t *queue, int host, int verbose) {
 			}
 
 #ifdef PARAM_HAVE_TIMESTAMP
-			/* Only remote paramters use timestamps */
+			/* Only remote parameters use timestamps */
 			if (*param->node != 0) {
 				/* If no timestamp was provided, use client received timestamp */
 				if (timestamp.tv_sec == 0) {
 					timestamp = queue->client_timestamp;
-					csp_clock_get_time(&timestamp);
-				} 
+				}
 				*param->timestamp = timestamp;
 			}
 #endif
@@ -173,6 +178,11 @@ int param_queue_apply(param_queue_t *queue, int host, int verbose) {
 	return return_code;
 }
 
+int param_queue_apply(param_queue_t *queue, int host, int verbose) {
+
+	return param_queue_apply_timestamp(queue, host, verbose, NULL);
+}
+
 void param_queue_print(param_queue_t *queue) {
 	if (queue->type == PARAM_QUEUE_TYPE_GET) {
 		printf("cmd new get %s\n", queue->name);
@@ -243,4 +253,4 @@ void param_queue_print_params(param_queue_t *queue, uint32_t ref_timestamp) {
 		}
 		outer_count++;
 	}
-}
\ No newline at end of file
+}
diff --git a/src/param/param_serializer.c b/src/param/param_serializer.c
index 8a42751..24aad67 100644
--- a/src/param/param_serializer.c
+++ b/src/param/param_serializer.c
@@ -70,14 +70,20 @@ void param_serialize_id(mpack_writer_t *writer, param_t *param, int offset, para
 		int node_flag = (queue->last_node != node) ? 1 : 0;
 #ifdef PARAM_HAVE_TIMESTAMP
 		int timestamp_flag = (queue->last_timestamp.tv_sec != param->timestamp->tv_sec) ? 1 : 0;
+		int extendedtimestamp_flag = 0;
+#ifdef EXTENDED_TIMESTAMP
+		extendedtimestamp_flag = (queue->last_timestamp.tv_nsec != param->timestamp->tv_nsec) ? 1 : 0;
+#endif /* EXTENDED_TIMESTAMP */
 #else
 		int timestamp_flag = 0;
+		int extendedtimestamp_flag = 0;
 #endif
 		int extendedid_flag = (param->id > 0x3ff) ? 1 : 0;
 
-		uint16_t header = array_flag << PARAM_HEADER_ARRAY_POS 
+		uint16_t header = array_flag << PARAM_HEADER_ARRAY_POS
 						| node_flag << PARAM_HEADER_NODE_POS
 						| timestamp_flag << PARAM_HEADER_TIMESTAMP_POS
+						| extendedtimestamp_flag << PARAM_HEADER_EXTENDEDTIMESTAMP_POS
 						| extendedid_flag << PARAM_HEADER_EXTENDEDID_POS
 						|(param->id & PARAM_HEADER_ID_MASK);
 		header = htobe16(header);
@@ -100,6 +106,12 @@ void param_serialize_id(mpack_writer_t *writer, param_t *param, int offset, para
 			uint32_t _timestamp = htobe32(param->timestamp->tv_sec);
 			mpack_write_bytes(writer, (char*) &_timestamp, 4);
 		}
+
+		if (extendedtimestamp_flag) {
+			queue->last_timestamp.tv_nsec = param->timestamp->tv_nsec;
+			uint32_t _timestamp_ns = htobe32(param->timestamp->tv_nsec);
+			mpack_write_bytes(writer, (char*) &_timestamp_ns, 4);
+		}
 #endif
 
 		if (extendedid_flag) {
@@ -168,19 +180,14 @@ void param_deserialize_id(mpack_reader_t *reader, int *id, int *node, csp_timest
 				queue->last_timestamp = queue->client_timestamp;
 			} else {
 				queue->last_timestamp.tv_sec = _timestamp;
-				if (extendedtimestamp_flag) {
-					uint32_t _timestamp_ns;
-					mpack_read_bytes(reader, (char*) &_timestamp_ns, 4);
-					_timestamp_ns = be32toh(_timestamp_ns);
-					queue->last_timestamp.tv_nsec = _timestamp_ns;
-				} else {
-					queue->last_timestamp.tv_nsec = 0;
-				}
 			}
-		} else if (extendedtimestamp_flag) {
-			/* Invalid header combination, discard header field */
+		}
+
+		if (extendedtimestamp_flag) {
 			uint32_t _timestamp_ns;
 			mpack_read_bytes(reader, (char*) &_timestamp_ns, 4);
+			_timestamp_ns = be32toh(_timestamp_ns);
+			queue->last_timestamp.tv_nsec = _timestamp_ns;
 		}
 		*timestamp = queue->last_timestamp;