Hi @uts09 ,
I think there are several misunderstandings.

1. scscf.xml is read by the cdp module, not by the ims_isc module
   1a) The SAR message to the HSS is not triggered by the ims_isc module, but by the ims_registrar_scscf module, afaik
2. The HSS does not process SIP requests, but it processes DIAMETER
3. Are you sure, you have a Scenario, where you send an Initial INVITE with a PSI in the Request Line?
4. Have you configured the PSI at the HSS?

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