Hi @christoph-v, ims_isc module is picking default route from scscf.xml file entry i.e. <DefaultRoute FQDN="hss.net1.test" metric="10"/> Due to this S-CSCF is forwarding the request to hss.net1.test(port 5065) and not to application server configured in HSS. Even if I set multiple default routes, ims_isc is only reading the first <DefaultRoute>. Is there any way to override this?