{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://jambonz.org/schema/callbacks/sip-refer-event",
  "title": "SIP Refer EventHook Payload",
  "description": "Payload sent to the sip-refer eventHook when a SIP NOTIFY is received with transfer status updates.",
  "type": "object",
  "properties": {
    "event": {
      "type": "string",
      "const": "transfer-status",
      "description": "Event type — always 'transfer-status' for REFER notifications."
    },
    "call_status": {
      "type": "integer",
      "description": "SIP status code from the NOTIFY sipfrag body (e.g. 100 for trying, 180 for ringing, 200 for success)."
    }
  },
  "required": ["event", "call_status"],
  "additionalProperties": true
}