I'm getting the following error when I try to place calls using the Twilio REST API.

https://www.twilio.com/docs/api/rest

HTTP/1.1 401 Unauthorized 
Server: nginx 
Date: Thu, 10 May 2012 16:50:48 GMT 
Content-Type: application/xml 
Connection: close 
WWW-Authenticate: Basic realm="Twilio API" 
Etag: 
Last-Modified: 
Content-Length: 233 

401 Authenticate 20003 
http://www.twilio.com/docs/errors/20003

I googled, but found nothing. Anyone had this issue?

What I POSTed on the API call was:-

$url = 'https://api.twilio.com/2010-04-01/Accounts/ACdxxxxxxx/Calls';

From => +1415xxxxxx 
To => +1646xxxxx
Url => http://173.201.xx.xx/Test/Twilio/twilio_test.php
twilio phone-call twilio-api
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