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TS 29.228 (CT4)
IMS Cx and Dx Interfaces – Signalling flows and message contents

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V14.5.0 (PDF)    2017/12    91 p.
V13.5.0    2017/09    89 p.
V12.10.0    2017/06    86 p.
V11.11.0    2015/09    79 p.
V10.8.0    2013/09    75 p.
V9.12.0    2013/09    73 p.
V8.19.0    2013/09    73 p.
V7.18.0    2013/03    65 p.
V6.17.0    2010/12    60 p.
V5.22.0    2010/12    53 p.

Rapporteur:  Ms. Bartolome, Maria-Cruz
See also:  IMS-related TS/TR    

This TS specifies:
  • The interactions between the HSS (Home Subscriber Server) and the CSCF (Call Session Control Functions), referred to as the Cx interface.
  • The interactions between the CSCF and the SLF (Server Locator Function), referred to as the Dx interface.
  • The interactions between the SIP Core and the SIP database, referred to as the Cx interface, for the Mission Critical Services, where this interface is named as AAA-1, as described in TS 23.280.


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1   Scope [R5]   PDF-p. 8
2   References [R5]
3   Definitions, symbols and abbreviations [R5]   PDF-p. 9
4   Main Concept [R5]
5   General Architecture [R5]   PDF-p. 11
6   Procedure Descriptions [R5]   PDF-p. 12
6.1   Location management procedures
6.2   User data handling procedures   PDF-p. 32
6.3   Authentication procedures   PDF-p. 35
6.4   User identity to HSS resolution   PDF-p. 39      Up
6.5   Implicit registration   PDF-p. 40
6.6   Download of the Relevant User Profile and Charging Information and Allowed WAF and/or WWSF Identities   PDF-p. 42
6.7   S-CSCF Assignment

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