action sms77_voice {
  label: "Voice"
  provider: sms77
  method: POST
  path: "/voice"
  encoding: json
  input: {
    type: "object"
    properties: {
      from: {
        type: "string"
      }
      text: {
        type: "string"
      }
      to: {
        type: "string"
      }
      xml: {
        type: "number"
        enum: [1, 0]
      }
    }
    required: ["text", "to"]
    additionalProperties: false
  }
  output: {
    type: "object"
    additionalProperties: true
  }
}