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TS 29.228 (CT4)
IMS Cx and Dx Interfaces – Signalling Flows and Message Contents

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for a better overview, the Table of Contents (ToC) is reproduced
V15.2.0 (PDF)  2019/03  91 p.
V14.5.0  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:

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.