diff --git a/res/ari/ari_model_validators.c b/res/ari/ari_model_validators.c
index d5f1885ad7..bc7ac6b2fa 100644
--- a/res/ari/ari_model_validators.c
+++ b/res/ari/ari_model_validators.c
@@ -2171,6 +2171,7 @@ int ast_ari_validate_application_replaced(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
 		if (strcmp("asterisk_id", ast_json_object_iter_key(iter)) == 0) {
@@ -2204,6 +2205,7 @@ int ast_ari_validate_application_replaced(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -2229,6 +2231,11 @@ int ast_ari_validate_application_replaced(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ApplicationReplaced missing required field timestamp\n");
+		res = 0;
+	}
+
 	return res;
 }
 
@@ -2243,6 +2250,7 @@ int ast_ari_validate_bridge_attended_transfer(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_destination_type = 0;
 	int has_is_external = 0;
 	int has_result = 0;
@@ -2281,6 +2289,7 @@ int ast_ari_validate_bridge_attended_transfer(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -2455,6 +2464,11 @@ int ast_ari_validate_bridge_attended_transfer(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI BridgeAttendedTransfer missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_destination_type) {
 		ast_log(LOG_ERROR, "ARI BridgeAttendedTransfer missing required field destination_type\n");
 		res = 0;
@@ -2494,6 +2508,7 @@ int ast_ari_validate_bridge_blind_transfer(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 	int has_context = 0;
 	int has_exten = 0;
@@ -2532,6 +2547,7 @@ int ast_ari_validate_bridge_blind_transfer(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -2634,6 +2650,11 @@ int ast_ari_validate_bridge_blind_transfer(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI BridgeBlindTransfer missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI BridgeBlindTransfer missing required field channel\n");
 		res = 0;
@@ -2673,6 +2694,7 @@ int ast_ari_validate_bridge_created(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_bridge = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -2707,6 +2729,7 @@ int ast_ari_validate_bridge_created(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -2742,6 +2765,11 @@ int ast_ari_validate_bridge_created(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI BridgeCreated missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_bridge) {
 		ast_log(LOG_ERROR, "ARI BridgeCreated missing required field bridge\n");
 		res = 0;
@@ -2761,6 +2789,7 @@ int ast_ari_validate_bridge_destroyed(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_bridge = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -2795,6 +2824,7 @@ int ast_ari_validate_bridge_destroyed(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -2830,6 +2860,11 @@ int ast_ari_validate_bridge_destroyed(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI BridgeDestroyed missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_bridge) {
 		ast_log(LOG_ERROR, "ARI BridgeDestroyed missing required field bridge\n");
 		res = 0;
@@ -2849,6 +2884,7 @@ int ast_ari_validate_bridge_merged(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_bridge = 0;
 	int has_bridge_from = 0;
 
@@ -2884,6 +2920,7 @@ int ast_ari_validate_bridge_merged(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -2929,6 +2966,11 @@ int ast_ari_validate_bridge_merged(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI BridgeMerged missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_bridge) {
 		ast_log(LOG_ERROR, "ARI BridgeMerged missing required field bridge\n");
 		res = 0;
@@ -2953,6 +2995,7 @@ int ast_ari_validate_bridge_video_source_changed(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_bridge = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -2987,6 +3030,7 @@ int ast_ari_validate_bridge_video_source_changed(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -3031,6 +3075,11 @@ int ast_ari_validate_bridge_video_source_changed(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI BridgeVideoSourceChanged missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_bridge) {
 		ast_log(LOG_ERROR, "ARI BridgeVideoSourceChanged missing required field bridge\n");
 		res = 0;
@@ -3050,6 +3099,7 @@ int ast_ari_validate_channel_caller_id(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_caller_presentation = 0;
 	int has_caller_presentation_txt = 0;
 	int has_channel = 0;
@@ -3086,6 +3136,7 @@ int ast_ari_validate_channel_caller_id(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -3141,6 +3192,11 @@ int ast_ari_validate_channel_caller_id(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelCallerId missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_caller_presentation) {
 		ast_log(LOG_ERROR, "ARI ChannelCallerId missing required field caller_presentation\n");
 		res = 0;
@@ -3170,6 +3226,7 @@ int ast_ari_validate_channel_connected_line(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -3204,6 +3261,7 @@ int ast_ari_validate_channel_connected_line(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -3239,6 +3297,11 @@ int ast_ari_validate_channel_connected_line(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelConnectedLine missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI ChannelConnectedLine missing required field channel\n");
 		res = 0;
@@ -3258,6 +3321,7 @@ int ast_ari_validate_channel_created(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -3292,6 +3356,7 @@ int ast_ari_validate_channel_created(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -3327,6 +3392,11 @@ int ast_ari_validate_channel_created(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelCreated missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI ChannelCreated missing required field channel\n");
 		res = 0;
@@ -3346,6 +3416,7 @@ int ast_ari_validate_channel_destroyed(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_cause = 0;
 	int has_cause_txt = 0;
 	int has_channel = 0;
@@ -3382,6 +3453,7 @@ int ast_ari_validate_channel_destroyed(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -3437,6 +3509,11 @@ int ast_ari_validate_channel_destroyed(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelDestroyed missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_cause) {
 		ast_log(LOG_ERROR, "ARI ChannelDestroyed missing required field cause\n");
 		res = 0;
@@ -3466,6 +3543,7 @@ int ast_ari_validate_channel_dialplan(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 	int has_dialplan_app = 0;
 	int has_dialplan_app_data = 0;
@@ -3502,6 +3580,7 @@ int ast_ari_validate_channel_dialplan(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -3557,6 +3636,11 @@ int ast_ari_validate_channel_dialplan(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelDialplan missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI ChannelDialplan missing required field channel\n");
 		res = 0;
@@ -3586,6 +3670,7 @@ int ast_ari_validate_channel_dtmf_received(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 	int has_digit = 0;
 	int has_duration_ms = 0;
@@ -3622,6 +3707,7 @@ int ast_ari_validate_channel_dtmf_received(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -3677,6 +3763,11 @@ int ast_ari_validate_channel_dtmf_received(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelDtmfReceived missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI ChannelDtmfReceived missing required field channel\n");
 		res = 0;
@@ -3706,6 +3797,7 @@ int ast_ari_validate_channel_entered_bridge(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_bridge = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -3740,6 +3832,7 @@ int ast_ari_validate_channel_entered_bridge(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -3784,6 +3877,11 @@ int ast_ari_validate_channel_entered_bridge(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelEnteredBridge missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_bridge) {
 		ast_log(LOG_ERROR, "ARI ChannelEnteredBridge missing required field bridge\n");
 		res = 0;
@@ -3803,6 +3901,7 @@ int ast_ari_validate_channel_hangup_request(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -3837,6 +3936,7 @@ int ast_ari_validate_channel_hangup_request(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -3890,6 +3990,11 @@ int ast_ari_validate_channel_hangup_request(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelHangupRequest missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI ChannelHangupRequest missing required field channel\n");
 		res = 0;
@@ -3909,6 +4014,7 @@ int ast_ari_validate_channel_hold(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -3943,6 +4049,7 @@ int ast_ari_validate_channel_hold(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -3987,6 +4094,11 @@ int ast_ari_validate_channel_hold(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelHold missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI ChannelHold missing required field channel\n");
 		res = 0;
@@ -4006,6 +4118,7 @@ int ast_ari_validate_channel_left_bridge(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_bridge = 0;
 	int has_channel = 0;
 
@@ -4041,6 +4154,7 @@ int ast_ari_validate_channel_left_bridge(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -4086,6 +4200,11 @@ int ast_ari_validate_channel_left_bridge(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelLeftBridge missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_bridge) {
 		ast_log(LOG_ERROR, "ARI ChannelLeftBridge missing required field bridge\n");
 		res = 0;
@@ -4110,6 +4229,7 @@ int ast_ari_validate_channel_state_change(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -4144,6 +4264,7 @@ int ast_ari_validate_channel_state_change(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -4179,6 +4300,11 @@ int ast_ari_validate_channel_state_change(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelStateChange missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI ChannelStateChange missing required field channel\n");
 		res = 0;
@@ -4198,6 +4324,7 @@ int ast_ari_validate_channel_talking_finished(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 	int has_duration = 0;
 
@@ -4233,6 +4360,7 @@ int ast_ari_validate_channel_talking_finished(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -4278,6 +4406,11 @@ int ast_ari_validate_channel_talking_finished(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelTalkingFinished missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI ChannelTalkingFinished missing required field channel\n");
 		res = 0;
@@ -4302,6 +4435,7 @@ int ast_ari_validate_channel_talking_started(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -4336,6 +4470,7 @@ int ast_ari_validate_channel_talking_started(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -4371,6 +4506,11 @@ int ast_ari_validate_channel_talking_started(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelTalkingStarted missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI ChannelTalkingStarted missing required field channel\n");
 		res = 0;
@@ -4390,6 +4530,7 @@ int ast_ari_validate_channel_unhold(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -4424,6 +4565,7 @@ int ast_ari_validate_channel_unhold(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -4459,6 +4601,11 @@ int ast_ari_validate_channel_unhold(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelUnhold missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI ChannelUnhold missing required field channel\n");
 		res = 0;
@@ -4478,6 +4625,7 @@ int ast_ari_validate_channel_userevent(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_eventname = 0;
 	int has_userevent = 0;
 
@@ -4513,6 +4661,7 @@ int ast_ari_validate_channel_userevent(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -4585,6 +4734,11 @@ int ast_ari_validate_channel_userevent(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelUserevent missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_eventname) {
 		ast_log(LOG_ERROR, "ARI ChannelUserevent missing required field eventname\n");
 		res = 0;
@@ -4609,6 +4763,7 @@ int ast_ari_validate_channel_varset(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_value = 0;
 	int has_variable = 0;
 
@@ -4644,6 +4799,7 @@ int ast_ari_validate_channel_varset(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -4698,6 +4854,11 @@ int ast_ari_validate_channel_varset(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ChannelVarset missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_value) {
 		ast_log(LOG_ERROR, "ARI ChannelVarset missing required field value\n");
 		res = 0;
@@ -4801,6 +4962,7 @@ int ast_ari_validate_contact_status_change(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_contact_info = 0;
 	int has_endpoint = 0;
 
@@ -4836,6 +4998,7 @@ int ast_ari_validate_contact_status_change(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -4881,6 +5044,11 @@ int ast_ari_validate_contact_status_change(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI ContactStatusChange missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_contact_info) {
 		ast_log(LOG_ERROR, "ARI ContactStatusChange missing required field contact_info\n");
 		res = 0;
@@ -4905,6 +5073,7 @@ int ast_ari_validate_device_state_changed(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_device_state = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -4939,6 +5108,7 @@ int ast_ari_validate_device_state_changed(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -4974,6 +5144,11 @@ int ast_ari_validate_device_state_changed(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI DeviceStateChanged missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_device_state) {
 		ast_log(LOG_ERROR, "ARI DeviceStateChanged missing required field device_state\n");
 		res = 0;
@@ -4993,6 +5168,7 @@ int ast_ari_validate_dial(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_dialstatus = 0;
 	int has_peer = 0;
 
@@ -5028,6 +5204,7 @@ int ast_ari_validate_dial(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -5109,6 +5286,11 @@ int ast_ari_validate_dial(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI Dial missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_dialstatus) {
 		ast_log(LOG_ERROR, "ARI Dial missing required field dialstatus\n");
 		res = 0;
@@ -5133,6 +5315,7 @@ int ast_ari_validate_endpoint_state_change(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_endpoint = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -5167,6 +5350,7 @@ int ast_ari_validate_endpoint_state_change(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -5202,6 +5386,11 @@ int ast_ari_validate_endpoint_state_change(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI EndpointStateChange missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_endpoint) {
 		ast_log(LOG_ERROR, "ARI EndpointStateChange missing required field endpoint\n");
 		res = 0;
@@ -5221,6 +5410,7 @@ int ast_ari_validate_event(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	const char *discriminator;
 
 	discriminator = ast_json_string_get(ast_json_object_get(json, "type"));
@@ -5384,6 +5574,7 @@ int ast_ari_validate_event(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -5409,6 +5600,11 @@ int ast_ari_validate_event(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI Event missing required field timestamp\n");
+		res = 0;
+	}
+
 	return res;
 }
 
@@ -5744,6 +5940,7 @@ int ast_ari_validate_peer_status_change(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_endpoint = 0;
 	int has_peer = 0;
 
@@ -5779,6 +5976,7 @@ int ast_ari_validate_peer_status_change(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -5824,6 +6022,11 @@ int ast_ari_validate_peer_status_change(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI PeerStatusChange missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_endpoint) {
 		ast_log(LOG_ERROR, "ARI PeerStatusChange missing required field endpoint\n");
 		res = 0;
@@ -5848,6 +6051,7 @@ int ast_ari_validate_playback_continuing(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_playback = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -5882,6 +6086,7 @@ int ast_ari_validate_playback_continuing(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -5917,6 +6122,11 @@ int ast_ari_validate_playback_continuing(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI PlaybackContinuing missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_playback) {
 		ast_log(LOG_ERROR, "ARI PlaybackContinuing missing required field playback\n");
 		res = 0;
@@ -5936,6 +6146,7 @@ int ast_ari_validate_playback_finished(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_playback = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -5970,6 +6181,7 @@ int ast_ari_validate_playback_finished(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -6005,6 +6217,11 @@ int ast_ari_validate_playback_finished(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI PlaybackFinished missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_playback) {
 		ast_log(LOG_ERROR, "ARI PlaybackFinished missing required field playback\n");
 		res = 0;
@@ -6024,6 +6241,7 @@ int ast_ari_validate_playback_started(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_playback = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -6058,6 +6276,7 @@ int ast_ari_validate_playback_started(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -6093,6 +6312,11 @@ int ast_ari_validate_playback_started(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI PlaybackStarted missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_playback) {
 		ast_log(LOG_ERROR, "ARI PlaybackStarted missing required field playback\n");
 		res = 0;
@@ -6112,6 +6336,7 @@ int ast_ari_validate_recording_failed(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_recording = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -6146,6 +6371,7 @@ int ast_ari_validate_recording_failed(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -6181,6 +6407,11 @@ int ast_ari_validate_recording_failed(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI RecordingFailed missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_recording) {
 		ast_log(LOG_ERROR, "ARI RecordingFailed missing required field recording\n");
 		res = 0;
@@ -6200,6 +6431,7 @@ int ast_ari_validate_recording_finished(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_recording = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -6234,6 +6466,7 @@ int ast_ari_validate_recording_finished(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -6269,6 +6502,11 @@ int ast_ari_validate_recording_finished(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI RecordingFinished missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_recording) {
 		ast_log(LOG_ERROR, "ARI RecordingFinished missing required field recording\n");
 		res = 0;
@@ -6288,6 +6526,7 @@ int ast_ari_validate_recording_started(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_recording = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -6322,6 +6561,7 @@ int ast_ari_validate_recording_started(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -6357,6 +6597,11 @@ int ast_ari_validate_recording_started(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI RecordingStarted missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_recording) {
 		ast_log(LOG_ERROR, "ARI RecordingStarted missing required field recording\n");
 		res = 0;
@@ -6376,6 +6621,7 @@ int ast_ari_validate_stasis_end(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_channel = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -6410,6 +6656,7 @@ int ast_ari_validate_stasis_end(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -6445,6 +6692,11 @@ int ast_ari_validate_stasis_end(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI StasisEnd missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_channel) {
 		ast_log(LOG_ERROR, "ARI StasisEnd missing required field channel\n");
 		res = 0;
@@ -6464,6 +6716,7 @@ int ast_ari_validate_stasis_start(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_args = 0;
 	int has_channel = 0;
 
@@ -6499,6 +6752,7 @@ int ast_ari_validate_stasis_start(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -6554,6 +6808,11 @@ int ast_ari_validate_stasis_start(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI StasisStart missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_args) {
 		ast_log(LOG_ERROR, "ARI StasisStart missing required field args\n");
 		res = 0;
@@ -6578,6 +6837,7 @@ int ast_ari_validate_text_message_received(struct ast_json *json)
 	struct ast_json_iter *iter;
 	int has_type = 0;
 	int has_application = 0;
+	int has_timestamp = 0;
 	int has_message = 0;
 
 	for (iter = ast_json_object_iter(json); iter; iter = ast_json_object_iter_next(json, iter)) {
@@ -6612,6 +6872,7 @@ int ast_ari_validate_text_message_received(struct ast_json *json)
 		} else
 		if (strcmp("timestamp", ast_json_object_iter_key(iter)) == 0) {
 			int prop_is_valid;
+			has_timestamp = 1;
 			prop_is_valid = ast_ari_validate_date(
 				ast_json_object_iter_value(iter));
 			if (!prop_is_valid) {
@@ -6656,6 +6917,11 @@ int ast_ari_validate_text_message_received(struct ast_json *json)
 		res = 0;
 	}
 
+	if (!has_timestamp) {
+		ast_log(LOG_ERROR, "ARI TextMessageReceived missing required field timestamp\n");
+		res = 0;
+	}
+
 	if (!has_message) {
 		ast_log(LOG_ERROR, "ARI TextMessageReceived missing required field message\n");
 		res = 0;
diff --git a/res/ari/ari_model_validators.h b/res/ari/ari_model_validators.h
index 484f9c1a1f..8fa28bc9eb 100644
--- a/res/ari/ari_model_validators.h
+++ b/res/ari/ari_model_validators.h
@@ -1558,12 +1558,12 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * BridgeAttendedTransfer
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - destination_application: string
  * - destination_bridge: string
  * - destination_link_first_leg: Channel
@@ -1584,7 +1584,7 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - bridge: Bridge
  * - channel: Channel (required)
  * - context: string (required)
@@ -1597,33 +1597,33 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - bridge: Bridge (required)
  * BridgeDestroyed
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - bridge: Bridge (required)
  * BridgeMerged
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - bridge: Bridge (required)
  * - bridge_from: Bridge (required)
  * BridgeVideoSourceChanged
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - bridge: Bridge (required)
  * - old_video_source_id: string
  * ChannelCallerId
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - caller_presentation: int (required)
  * - caller_presentation_txt: string (required)
  * - channel: Channel (required)
@@ -1631,19 +1631,19 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel (required)
  * ChannelCreated
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel (required)
  * ChannelDestroyed
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - cause: int (required)
  * - cause_txt: string (required)
  * - channel: Channel (required)
@@ -1651,7 +1651,7 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel (required)
  * - dialplan_app: string (required)
  * - dialplan_app_data: string (required)
@@ -1659,7 +1659,7 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel (required)
  * - digit: string (required)
  * - duration_ms: int (required)
@@ -1667,14 +1667,14 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - bridge: Bridge (required)
  * - channel: Channel
  * ChannelHangupRequest
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - cause: int
  * - channel: Channel (required)
  * - soft: boolean
@@ -1682,46 +1682,46 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel (required)
  * - musicclass: string
  * ChannelLeftBridge
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - bridge: Bridge (required)
  * - channel: Channel (required)
  * ChannelStateChange
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel (required)
  * ChannelTalkingFinished
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel (required)
  * - duration: int (required)
  * ChannelTalkingStarted
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel (required)
  * ChannelUnhold
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel (required)
  * ChannelUserevent
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - bridge: Bridge
  * - channel: Channel
  * - endpoint: Endpoint
@@ -1731,7 +1731,7 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel
  * - value: string (required)
  * - variable: string (required)
@@ -1744,20 +1744,20 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - contact_info: ContactInfo (required)
  * - endpoint: Endpoint (required)
  * DeviceStateChanged
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - device_state: DeviceState (required)
  * Dial
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - caller: Channel
  * - dialstatus: string (required)
  * - dialstring: string
@@ -1768,13 +1768,13 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - endpoint: Endpoint (required)
  * Event
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * Message
  * - asterisk_id: string
  * - type: string (required)
@@ -1792,56 +1792,56 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - endpoint: Endpoint (required)
  * - peer: Peer (required)
  * PlaybackContinuing
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - playback: Playback (required)
  * PlaybackFinished
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - playback: Playback (required)
  * PlaybackStarted
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - playback: Playback (required)
  * RecordingFailed
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - recording: LiveRecording (required)
  * RecordingFinished
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - recording: LiveRecording (required)
  * RecordingStarted
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - recording: LiveRecording (required)
  * StasisEnd
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - channel: Channel (required)
  * StasisStart
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - args: List[string] (required)
  * - channel: Channel (required)
  * - replace_channel: Channel
@@ -1849,7 +1849,7 @@ ari_validator ast_ari_validate_application_fn(void);
  * - asterisk_id: string
  * - type: string (required)
  * - application: string (required)
- * - timestamp: Date
+ * - timestamp: Date (required)
  * - endpoint: Endpoint
  * - message: TextMessage (required)
  * Application
diff --git a/res/res_stasis.c b/res/res_stasis.c
index 4b7c3ed74c..d33d4de87f 100644
--- a/res/res_stasis.c
+++ b/res/res_stasis.c
@@ -1460,30 +1460,35 @@ int stasis_app_exec(struct ast_channel *chan, const char *app_name, int argc,
 					int next_argc = control_next_app_args_size(control);
 					char **next_argv = control_next_app_args(control);
 
-					msg = ast_json_pack("{s: s, s: o, s: s, s: []}",
+					msg = ast_json_pack("{s: s, s: o, s: o, s: s, s: []}",
 						"type", "ApplicationMoveFailed",
+						"timestamp", ast_json_timeval(ast_tvnow(), NULL),
 						"channel", ast_channel_snapshot_to_json(snapshot, NULL),
 						"destination", control_next_app(control),
 						"args");
-					json_args = ast_json_object_get(msg, "args");
-					if (!json_args) {
-						ast_log(LOG_ERROR, "Could not get args json array");
+					if (!msg) {
+						ast_log(LOG_ERROR, "Failed to pack JSON for ApplicationMoveFailed message\n");
 					} else {
-						int r = 0;
-						int idx;
-						for (idx = 0; idx < next_argc; ++idx) {
-							r = ast_json_array_append(json_args,
-								ast_json_string_create(next_argv[idx]));
-							if (r != 0) {
-								ast_log(LOG_ERROR, "Error appending to ApplicationMoveFailed message\n");
-								break;
+						json_args = ast_json_object_get(msg, "args");
+						if (!json_args) {
+							ast_log(LOG_ERROR, "Could not get args json array");
+						} else {
+							int r = 0;
+							int idx;
+							for (idx = 0; idx < next_argc; ++idx) {
+								r = ast_json_array_append(json_args,
+									ast_json_string_create(next_argv[idx]));
+								if (r != 0) {
+									ast_log(LOG_ERROR, "Error appending to ApplicationMoveFailed message\n");
+									break;
+								}
+							}
+							if (r == 0) {
+								app_send(control_app(control), msg);
 							}
 						}
-						if (r == 0) {
-							app_send(control_app(control), msg);
-						}
+						ast_json_unref(msg);
 					}
-					ast_json_unref(msg);
 				}
 			}
 			control_move_cleanup(control);
diff --git a/res/res_stasis_playback.c b/res/res_stasis_playback.c
index 4a8e84dc24..4a75382377 100644
--- a/res/res_stasis_playback.c
+++ b/res/res_stasis_playback.c
@@ -111,8 +111,9 @@ static struct ast_json *playback_to_json(struct stasis_message *message,
 		return NULL;
 	}
 
-	return ast_json_pack("{s: s, s: O}",
+	return ast_json_pack("{s: s, s: o?, s: O}",
 		"type", type,
+		"timestamp", ast_json_timeval(*stasis_message_timestamp(message), NULL),
 		"playback", blob);
 }
 
diff --git a/res/res_stasis_recording.c b/res/res_stasis_recording.c
index 4077fc8a34..0ab50e4d8b 100644
--- a/res/res_stasis_recording.c
+++ b/res/res_stasis_recording.c
@@ -89,8 +89,9 @@ static struct ast_json *recording_to_json(struct stasis_message *message,
 		return NULL;
 	}
 
-	return ast_json_pack("{s: s, s: O}",
+	return ast_json_pack("{s: s, s: o?, s: O}",
 		"type", type,
+		"timestamp", ast_json_timeval(*stasis_message_timestamp(message), NULL),
 		"recording", blob);
 }
 
diff --git a/res/stasis/app.c b/res/stasis/app.c
index 0f0923ae97..ed7336bd79 100644
--- a/res/stasis/app.c
+++ b/res/stasis/app.c
@@ -1113,8 +1113,9 @@ void app_update(struct stasis_app *app, stasis_app_cb handler, void *data)
 
 		ast_verb(1, "Replacing Stasis app '%s'\n", app->name);
 
-		msg = ast_json_pack("{s: s, s: s}",
+		msg = ast_json_pack("{s: s, s: o?, s: s}",
 			"type", "ApplicationReplaced",
+			"timestamp", ast_json_timeval(ast_tvnow(), NULL),
 			"application", app->name);
 		if (msg) {
 			app_send(app, msg);
diff --git a/rest-api/api-docs/events.json b/rest-api/api-docs/events.json
index c9f4b6ae42..c9822f6cbb 100644
--- a/rest-api/api-docs/events.json
+++ b/rest-api/api-docs/events.json
@@ -148,7 +148,7 @@
 				"timestamp": {
 					"type": "Date",
 					"description": "Time at which this event was created.",
-					"required": false
+					"required": true
 				}
 			},
 			"subTypes": [
diff --git a/tests/test_res_stasis.c b/tests/test_res_stasis.c
index 1d90a28f4b..1727107859 100644
--- a/tests/test_res_stasis.c
+++ b/tests/test_res_stasis.c
@@ -167,7 +167,10 @@ AST_TEST_DEFINE(app_replaced)
 	res = stasis_app_send(app_name, message);
 	ast_test_validate(test, 0 == res);
 	ast_test_validate(test, 1 == app_data1->invocations);
+	ast_test_validate(test, ast_json_object_get(ast_json_array_get(app_data1->messages, 0), "timestamp")? 1: 0);
+	ast_json_object_del(ast_json_array_get(app_data1->messages, 0), "timestamp");
 	ast_test_validate(test, ast_json_equal(expected_message1, app_data1->messages));
+
 	ast_test_validate(test, 1 == app_data2->invocations);
 	ast_test_validate(test, ast_json_equal(expected_message2, app_data2->messages));