I to send a SOAP request to Siebel from a PHP page to insert data. FYI Seibel does not provide WSDL URL for web service

I want to send data from my PHP page to Siebel CRM. As I have seen so may sample that web service provide a WSDL URL which need to invoke and it is very easy using SOAP Client in php. but how it work in siebel as it has no WSDL url, it's provide a WSDL file