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: Procedures for when a Serving-Call Session Control Function (S-CSCF) fails or loses registration data. It defines how the Home Subscriber Server (HSS) and other nodes collaborate to re-register users or restore sessions.
The specification covers several critical failure and recovery scenarios across the IMS domain:
Restoration relies on specific signaling flows and data synchronization methods: 123380
: These are specific Diameter protocol messages (Server-Assignment-Request and Location-Information-Request) used by the HSS and S-CSCF to update and overwrite user data during restoration events.
: Nodes use indicators (often via IETF RFC 6223) to detect the availability of peers and trigger restoration if a failure is detected. 4. Evolution and Versions : Procedures for when a Serving-Call Session Control
: Procedures for recovering the Home Subscriber Server, which acts as the central database for user identities and profiles.
: Mechanisms for the Proxy-CSCF to recover its relationship with the user equipment (UE) after a restart. : Nodes use indicators (often via IETF RFC
: During initial registration, the S-CSCF backs up critical data—such as the list of SIP proxies, contact information, and authentication schemes—to the HSS.