diff --git a/schema.json b/schema.json
new file mode 100644
index 0000000..4bca3a0
--- /dev/null
+++ b/schema.json
@@ -0,0 +1,138 @@
+{
+	"$defs" : {
+		"dstar_callsign": {"type": "string", "minLength": 8, "maxLength": 8},
+		"dstar_extension": {"type": "string", "minLength": 4, "maxLength": 4},
+		"ysf_callsign": {"type": "string", "minLength": 10, "maxLength": 10},
+		"m17_callsign": {"type": "string", "minLength": 9, "maxLength": 9},
+		"dmr_id": {"type": "integer", "minimum": 1, "maximum": 16777215},
+		"p25_id": {"type": "integer", "minimum": 1, "maximum": 65535},
+		"nxdn_id": {"type": "integer", "minimum": 1, "maximum": 65535},
+		"id_type": {"enum": ["group", "individual"]},
+		"source": {"enum": ["rf", "network"]},
+		"action": {"enum": ["start", "end", "lost"]},
+		"duration": {"type": "number", "minimum": 0.0},
+		"loss": {"type": "number", "minimum": 0.0},
+		"ber": {"type": "number", "minimum": 0.0},
+		"rssi": {"type": "number"},
+		"timestamp": {"type": "string" }
+	},
+
+	"MMDVM" : {
+		"type": "object",
+		"timestamp": {"$ref": "#/$defs/timestamp"},
+		"description": {"type": "string"},
+		"required": {"timestamp", "description"}
+	},
+
+	"D-Star" : {
+		"type": "object",
+		"timestamp": {"$ref": "#/$defs/timestamp"},
+		"source_callsign": {"$ref": "#/$defs/dstar_callsign"},
+		"source_ext": {"$ref": "#/$defs/dstar_extension"},
+		"destination_callsign": {"$ref": "#/$defs/dstar_callsign"},
+		"source": {"$ref": "#/$defs/source"},
+		"action": {"$ref": "#/$defs/action"},
+		"duration": {"$ref": "#/$defs/duration"},
+		"loss": {"$ref": "#/$defs/loss"},
+		"ber": {"$ref": "#/$defs/ber"},
+		"rssi": {
+			"min_rssi": {"$ref": "#/$defs/rssi"},
+			"max_rssi": {"$ref": "#/$defs/rssi"},
+			"ave_rssi": {"$ref": "#/$defs/rssi"}
+		},
+		"required": {"timestamp", "source_callsign", "source_ext", "destination_callsign", "source", "action"}
+	},
+
+	"DMR" : {
+		"type": "object",
+		"timestamp": {"$ref": "#/$defs/timestamp"},
+		"source_id": {"$ref": "#/$defs/dmr_id"},
+		"destination_id": {"$ref": "#/$defs/dmr_id"},
+		"destination_type": {"$ref": "#/$defs/id_type"},
+		"source": {"$ref": "#/$defs/source"},
+		"action": {"$ref": "#/$defs/action"},
+		"duration": {"$ref": "#/$defs/duration"},
+		"loss": {"$ref": "#/$defs/loss"},
+		"ber": {"$ref": "#/$defs/ber"},
+		"rssi": {
+			"min_rssi": {"$ref": "#/$defs/rssi"},
+			"max_rssi": {"$ref": "#/$defs/rssi"},
+			"ave_rssi": {"$ref": "#/$defs/rssi"}
+		},
+		"required": {"timestamp", "source_id", "destination_id", "destination_type", "source", "action"}
+	},
+
+	"SystemFusion" : {
+		"type": "object",
+		"timestamp": {"$ref": "#/$defs/timestamp"},
+		"source_callsign": {"$ref": "#/$defs/ysf_callsign"},
+		"destination_callsign": {"$ref": "#/$defs/ysf_callsign"},
+		"source": {"$ref": "#/$defs/source"},
+		"action": {"$ref": "#/$defs/action"},
+		"duration": {"$ref": "#/$defs/duration"},
+		"loss": {"$ref": "#/$defs/loss"},
+		"ber": {"$ref": "#/$defs/ber"},
+		"rssi": {
+			"min_rssi": {"$ref": "#/$defs/rssi"},
+			"max_rssi": {"$ref": "#/$defs/rssi"},
+			"ave_rssi": {"$ref": "#/$defs/rssi"}
+		},
+		"required": {"timestamp", "source_callsign", "destination_callsign", "source", "action"}
+	},
+
+	"P25" : {
+		"type": "object",
+		"timestamp": {"$ref": "#/$defs/timestamp"},
+		"source_id": {"$ref": "#/$defs/dmr_id"},
+		"destination_id": {"$ref": "#/$defs/p25_id"},
+		"destination_type": {"$ref": "#/$defs/id_type"},
+		"source": {"$ref": "#/$defs/source"},
+		"action": {"$ref": "#/$defs/action"},
+		"duration": {"$ref": "#/$defs/duration"},
+		"loss": {"$ref": "#/$defs/loss"},
+		"ber": {"$ref": "#/$defs/ber"},
+		"rssi": {
+			"min_rssi": {"$ref": "#/$defs/rssi"},
+			"max_rssi": {"$ref": "#/$defs/rssi"},
+			"ave_rssi": {"$ref": "#/$defs/rssi"}
+		},
+		"required": {"timestamp", "source_id", "destination_id", "destination_type", "source", "action"}
+	},
+
+	"NXDN" : {
+		"type": "object",
+		"timestamp": {"$ref": "#/$defs/timestamp"},
+		"source_id": {"$ref": "#/$defs/nxdn_id"},
+		"destination_id": {"$ref": "#/$defs/nxdn_id"},
+		"destination_type": {"$ref": "#/$defs/id_type"},
+		"source": {"$ref": "#/$defs/source"},
+		"action": {"$ref": "#/$defs/action"},
+		"duration": {"$ref": "#/$defs/duration"},
+		"loss": {"$ref": "#/$defs/loss"},
+		"ber": {"$ref": "#/$defs/ber"},
+		"rssi": {
+			"min_rssi": {"$ref": "#/$defs/rssi"},
+			"max_rssi": {"$ref": "#/$defs/rssi"},
+			"ave_rssi": {"$ref": "#/$defs/rssi"}
+		},
+		"required": {"timestamp", "source_id", "destination_id", "destination_type", "source", "action"}
+	},
+
+	"M17" : {
+		"type": "object",
+		"timestamp": {"$ref": "#/$defs/timestamp"},
+		"source_callsign": {"$ref": "#/$defs/m17_callsign"},
+		"destination_callsign": {"$ref": "#/$defs/m17_callsign"},
+		"source": {"$ref": "#/$defs/source"},
+		"action": {"$ref": "#/$defs/action"},
+		"duration": {"$ref": "#/$defs/duration"},
+		"loss": {"$ref": "#/$defs/loss"},
+		"ber": {"$ref": "#/$defs/ber"},
+		"rssi": {
+			"min_rssi": {"$ref": "#/$defs/rssi"},
+			"max_rssi": {"$ref": "#/$defs/rssi"},
+			"ave_rssi": {"$ref": "#/$defs/rssi"}
+		},
+		"required": {"timestamp", "source_callsign", "destination_callsign", "source", "action"}
+	}
+}