Thanks Hubert for the reply.
We are acting as an IDP site and its an IDP initiated scenario.
There could be hetrogenous plateform at SP side , not specifically Siteminder. ( setup is not yet completed)
I see in some CA dicussion saying:-
This request doesn't have to be an SP Initiated AuthnRequest. You could have another resource (separate from Federation) that
is protected on your IDP side. The SP can initiate a request to access this resource in the background every 12 mins or so even if the transaction is IDP
Initiated.
The only way to achieve your requirement is through a custom solution.
What do you think about this.
Thanks,
Abhinav Kumar