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Diameter Credit-Control Application
RFC 4006

Network Working Group                                          H. Hakala
Request for Comments: 4006                                    L. Mattila
Category: Standards Track                                       Ericsson
                                                           J-P. Koskinen
                                                                M. Stura
                                                             J. Loughney
                                                                   Nokia
                                                             August 2005

                 Diameter Credit-Control Application

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This document specifies a Diameter application that can be used to
   implement real-time credit-control for a variety of end user services
   such as network access, Session Initiation Protocol (SIP) services,
   messaging services, and download services.

Table of Contents

   1.  Introduction.................................................   4
       1.1.   Requirements Language.................................   5
       1.2.   Terminology...........................................   5
       1.3.   Advertising Application Support.......................   7
   2.  Architecture Models..........................................   7
   3.  Credit-Control Messages......................................   9
       3.1.   Credit-Control-Request (CCR) Command..................   9
       3.2.   Credit-Control-Answer (CCA) Command...................  11
   4.  Credit-Control Application Overview..........................  11
       4.1.   Service-Specific Rating Input and Interoperability....  13
   5.  Session Based Credit-Control.................................  15
       5.1.   General Principles....................................  15
       5.2.   First Interrogation...................................  21
       5.3.   Intermediate Interrogation............................  27
       5.4.   Final Interrogation...................................  29

Hakala, et al.              Standards Track                     [Page 1]
RFC 4006          Diameter Credit-Control Application        August 2005

       5.5.   Server-Initiated Credit Re-Authorization..............  30
       5.6.   Graceful Service Termination..........................  32
       5.7.   Failure Procedures....................................  38
   6.  One Time Event...............................................  41
       6.1.   Service Price Enquiry.................................  42
       6.2.   Balance Check.........................................  42
       6.3.   Direct Debiting.......................................  43
       6.4.   Refund................................................  44
       6.5.   Failure Procedure.....................................  44
   7.  Credit-Control Application State Machine.....................  46
   8.  Credit-Control AVPs..........................................  55
       8.1.   CC-Correlation-Id AVP.................................  58
       8.2.   CC-Request-Number AVP.................................  58
       8.3.   CC-Request-Type AVP...................................  58
       8.4.   CC-Session-Failover AVP...............................  59
       8.5.   CC-Sub-Session-Id AVP.................................  59
       8.6.   Check-Balance-Result AVP..............................  60
       8.7.   Cost-Information AVP..................................  60
       8.8.   Unit-Value AVP........................................  61
       8.9.   Exponent AVP..........................................  61
       8.10.  Value-Digits AVP......................................  61
       8.11.  Currency-Code AVP.....................................  62
       8.12.  Cost-Unit AVP.........................................  62
       8.13.  Credit-Control AVP....................................  62
       8.14.  Credit-Control-Failure-Handling AVP...................  62
       8.15.  Direct-Debiting-Failure-Handling AVP..................  63
       8.16.  Multiple-Services-Credit-Control AVP..................  64
       8.17.  Granted-Service-Unit AVP..............................  65
       8.18.  Requested-Service-Unit AVP............................  66
       8.19.  Used-Service-Unit AVP.................................  66
       8.20.  Tariff-Time-Change AVP................................  67

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