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.