php soap - ошибка подключения через прокси

При подключении через свою сеть все работает хорошо, однако если подключаться через корпоративный прокси то появляется такая ошибка:

SoapClient::SoapClient: ... failed to open stream: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond

Это код:

$http_headers = [
  "http" => [
    "protocol_version" => 1.1,
    "header" => "Authorization:Bearer ".$bearer
  ]
];
$params = [
  "stream_context" => stream_context_create ($http_headers),
  "trace" => true,
  "exceptions" => false
];
$client = new SoapClient ($url, $params);
$result = $client->SendMessage ([
  "name" => $name,
  "id" => $id,
  "mess" => $mess
]);
print_r ($result);