Combinations of Session Types and Authentication Types

The following table summarizes the combinations of authentication types and session types.

Authentication Type	Session Type	Description
None	None	A single request is sent with an anonymous user login, and the session is closed after the response is sent out. In order for the anonymous session to be identified by the AI, UsernameToken and PasswordText must be excluded in the SOAP headers.
Username and password	None	A single request is sent with the username and password used to log in, and the session is closed after the response is sent out.
Username and password	Stateless	The initial request to log in establishes a session that is to remain open and available for subsequent requests. The username and password are used to log in and a session token is returned in a SOAP header included in the outbound response. The session remains open.
Session token (stateless)	Stateless	Request to reconnect to an established session, using the information contained in the session token. If the session has been closed, then automatic relogin occurs. The Siebel servers include the session token in the SOAP header of the response. The session remains open.
Session token (stateless)	None	When a SOAP header carries a session token and has the session type set to None, then the Session Manager on the AI closes (logs out) of this session, and invalidates the session token. The session token is not used after the session is invalidated.