123380 Review

The primary goal of TS 23.380 is to ensure service continuity and high availability within the IMS core network. While network nodes (like the S-CSCF, HSS, and P-CSCF) are designed for reliability, maintenance or unforeseen failures can cause data loss or corruption. This document standardizes automatic restoration procedures to minimize user impact when these events occur. 2. Core Restoration Scenarios

The specification has evolved through multiple "Releases" to keep pace with mobile technology:

: Handling failures of application servers that provide specific services (e.g., VoLTE, messaging). 3. Key Technical Mechanisms 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.

: Procedures for recovering the Home Subscriber Server, which acts as the central database for user identities and profiles. The primary goal of TS 23

: 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.

: Focused on basic IMS recovery for GSM and UMTS. Key Technical Mechanisms : These are specific Diameter

: Mechanisms for the Proxy-CSCF to recover its relationship with the user equipment (UE) after a restart.