This is an example of how you could use Twilio to make a call to another number using one of your Twilio verified called IDs. In this case, our verified caller ID is "+17075550987".

index.php

<?php
    header("content-type: text/xml");
    echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
?>
<Response>
    <Gather action="make-call.php" timeout="30">
        <Say>Please enter the phone number you wish to dial</Say>
    </Gather>
</Response>

make-call.php

<?php
    header("content-type: text/xml");
    echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
?>
<Response>
    <Dial callerId="+17075550987"><?php echo $_POST['Digits'];?></Dial>
</Response>