Information on Session Pooling in case of Inbound Web Service.

Dear All,

We have an external Application (Portal, Java based application) which interacts with Siebel. There can be around 500 Concurrent Portal users performing query or Update in Siebel.

As of now the Siebel Inbound Webservice is defined as a Secured one with Authentication as USerId/Password and USer Id and Password is passed in SOAP header in the calling SOAP Request.  My Query is as below.

1. with above approach. my Webservice session is Statefull session right?? since everytime it will try to connect to EAI object manager with the Required credentials.

2. I want to make it Stateless, I have the process to make it stateless and use token generation principle for connections in same session.