use BitrixSoap\Client;

$address = 'http://user:password@hostname:port/path?query';
$namespace = 'http://namespace-from-xsd-schema.ru/';
$client = new Client($address, $namespace);

$response = $client->MethodName('arg1', 'arg2, 'argN');
$responseBodyArray = $result->Value;
$responseOtherParam = $result->OtherParamFromResponse;