Voice

{
  "type": "object",
  "properties": {
    "from": {
      "type": "string"
    },
    "text": {
      "type": "string"
    },
    "to": {
      "type": "string"
    },
    "xml": {
      "type": "number",
      "enum": [
        1,
        0
      ]
    }
  },
  "required": [
    "text",
    "to"
  ],
  "additionalProperties": false
}