Has anyone implemented Netegrity SiteMinder with Oracle 10g ( application server before?

We're planning to implement SiteMinder to perform single sign on to our Oracle portal.
Please forgive me for asking these questions here, as there isn't much notes on Netegrity SiteMinder around.

Our current Portal uses Oracle's own SSO OID authentication with microsoft AD.

I understand there is a requirement to install SiteMinder web agent on the Oracle HTTP server in order to communicate with the SiteMinder Policy server which holds the ACL.

But does anyone know if we still need to provide a synchronization process between SiteMinder policy server's user directory with Oracle OID in order for SSO to be successful?