{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://developers.telefoon.com/schema/call",
  "title": "Telefoon Call",
  "description": "Represents a voice call in the Telefoon EU telephony platform.",
  "type": "object",
  "required": ["id", "status", "direction", "from", "to"],
  "properties": {
    "id": { "type": "string", "description": "Unique call identifier" },
    "status": { "type": "string", "enum": ["queued","ringing","in-progress","completed","failed","busy","no-answer","canceled"] },
    "direction": { "type": "string", "enum": ["inbound","outbound"] },
    "from": { "type": "string", "description": "Originating phone number (E.164)" },
    "to": { "type": "string", "description": "Destination phone number (E.164)" },
    "duration": { "type": "integer", "description": "Duration in seconds" },
    "start_time": { "type": "string", "format": "date-time" },
    "end_time": { "type": "string", "format": "date-time" },
    "price": { "type": "string", "description": "Call cost" },
    "price_unit": { "type": "string", "default": "EUR", "description": "ISO 4217 currency code" }
  }
}