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TechSpec
  • Foreword
  • Introduction
  • 1 Scope
  • 2 References
  • 3 Definitions, symbols and abbreviations
  • 4 Restoration of Data in the S-CSCF
  • 5 Recovery after P-CSCF failure
    • 5.0 General
    • 5.1 Update PDP context/Bearer at P-CSCF failure
    • 5.2 Inform UE about P-CSCF failure
    • 5.4 HSS-based P-CSCF restoration for 3GPP access
    • 5.5 PCRF-based P-CSCF restoration
    • 5.6 P-CSCF restoration for WLAN
    • 5.7 Interaction between P-CSCF restoration and NBIFOM
    • 5.8 P-CSCF Restoration for 5GC
    • 5.9 P-CSCF Restoration in EPC with 5GC interworking
    • 5.10 P-CSCF Restoration in EPC for untrusted WLAN when N10 is used instead of S6b
  • 6 Recovery after SCC AS failure

5.0 General

23.3803GPPIMS Restoration ProceduresRelease 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

The following clauses show the requirements and information flows of IMS Restoration Procedures for the P-CSCF service interruption in each of the scenarios where they apply.

Procedures over S9 between V-PCRF and H-PCRF are not supported in this release of the specification.