callout.php

<?php

require_once("lib/client.php");

// The from number is your purhcased or test Sinch number.
// https://developers.sinch.com/docs/voice/getting-started/#getting-started

$from = $_ENV["CLI"];

// The to number is the destination you are calling.  
// Please ensure both numbers are in E164 format.
// https://community.sinch.com/t5/Glossary/E-164/ta-p/7537

$to = $_ENV["TO"];


// Text to Speech Callout
// https://developers.sinch.com/docs/voice/api-reference/voice/tag/Callouts/#tag/Callouts/operation/Callouts!path=ttsCallout&t=request

$callout_request = [
  "method" => "ttsCallout",
  "ttsCallout" => [
    "cli" => $from,
    "destination" => [
      "type" => "number",
      "endpoint" => $to
    ],
    "locale" => "en-US",
    "text" => "Hello, this is a call from Sinch. Congratulations! You made your first call."
  ]
];


$client = new client;
$call = $client->call($callout_request);

print("Callout request response: {$call} \n");