If you have our server IPs locked down, please make sure that these match the IPs to which web.bmtmicro.com resolves.

<?php
$is_bmt_server = false;
$remote_address = $_SERVER['REMOTE_ADDR'];
$bmt_servers = dns_get_record('web.bmtmicro.com', DNS_A);
for ($i = 0; $i < count($bmt_servers); $i++) {
    if ($remote_address == $bmt_servers[$i]['ip']) {
        $is_bmt_server = true;
        break;
    }
}
if ($is_bmt_server) {
    echo 'Remote call is from BMT Micro';
} else {
    echo 'Remote call is from someone we do not know';   
}
?>

Example PHP to Parse XML

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