Trying to call web service functions over https

Hello,

PHP version: PHP5, using php-based SOAP functions.

Currently I am trying to call some secure web services.  I am able to 
access the wsdl file and list all the funcitons available for my client 
object by calling __getFunctions(). However, when I go and actually call 
one of these functions, I get a SoapFault exception.

The wsdl file is accessed over http, but in the file I see that in one 
of the last lines it has the following tag:

<soap:address location=https://someURL/SecureWebService/>

I know that this is the tag that is giving me the problem, and in the 
page I acqure the url to the wsdl file, they have the following note:
"We use transport-level security (HTTPS) and a username and password 
token to secure access"
I am completely unsure of what I have to do to access these web services 
as the normal authentication mehtods have me authenticating to an http 
address and not https.
Thanks.