1. 1 Diameter Credit Control Application draft-hakala-diameter-credit-control-06.txt IETF 56 john.loughney@nokia.com Harri Hakala / Jukka-Pekka Koskinen / John Loughney / Leena Mattila / Marco Stura

2. 2 Motivation On-line / real-time / pre-paid accounting or has become very popular in mobile networks. SS7 based protocols and IN–based solutions approach are used A new IP-based accounting protocol is urgently needed to support credit based accounting for Internet services Diameter base accounting is not sufficient for real-time pre-paid services. By adding an optional credit-control application, theDiameter base accounting the needed functionality the can be provided by ‘existing’ AAA infrastructure.

3. 3 Overview A general purpose real-time accounting protocol. Enhance diameter accounting messages (ACR/ACA): with new mandatory controlling AVPs application defined state machines (session &event based state machines for client and server) application specific fault handling No new commands. Supports On-line credit control with credit reservation (using session records) and operations (using event records), such as: Price Enquiry Balance Check Direct Debiting Refund

4. 4 Updates Now a working group document Draft now officially included in 3GPP specifications - TS 32.225. Major changes: A server or client is not required to implement all functionality in the CCA. Optionality has been clarified in the draft Unknown/unsupported value responded with error Subscription-Id- Type Unknown AVPs can be ignored, i.e. 'M'-bit removed from AVP Flag table New Result-Code value 'DIAMETER_RATING_FAILED'.

5. 5 To Do Editorial clean-up; fix some keywords; clarification on some points. Fix all ’ID-nits’ Clarify with 3GPP if draft meets their needs. Nearly ready for WG last call?