用于印度号码的AWS SNS SMS

Question

I'm using AWS SDK 3.0 to send SMS via AWS SNS for indian numbers. I've ec2 instance created on AWS. Please refer the code below :

$params = array(
        'credentials' => array(
            'key' => 'XXXXXX',
            'secret' => 'XXXXXXX',
        ),
        'region' => 'us-west-2', // < your aws from SNS Topic region
        'version' => 'latest',
         'http' => [ 'verify' => false ]
    );
    $sns = new \Aws\Sns\SnsClient($params);

    $args = array(
        'MessageAttribute' => [
            'AWS.SNS.SMS.SenderID' => [
                'DataType'    => 'String',
                'StringValue' => 'Sender',
            ],
            'AWS.SNS.SMS.SMSType'  => [
                'DataType'    => 'String',
                'StringValue' => 'Transactional',
            ]
        ],
        "Message" => "Test Message",
        "PhoneNumber" => "+91XXXXXX",
        'MessageStructure' => 'string',
    );

    $result = $sns->publish($args);

This code is sending SMS. However, the SMS are getting logged as Promotional SMS instead of Transactional. Thus getting delivered between 9am to 8pm only.

Any help is much appreciated.