As described in the previous section, the subscriber host can optionally be (configuration controlled) established with default settings (sla-profile, sub-profile, app-profile) if the PCRF is not available to answer the CCR-I. This results in a subscriber-host state mismatch between the node and the PCRF, where the subscriber-host is established on the node but there is no corresponding Gx session established in the PCRF.
To resolve this situation, ESM periodically sends CCR-I for the Gx orphaned subscriber-host until the response from PCRF is received. The CCR-I is periodically retransmitted every 60 seconds.