TAILIEUCHUNG - Chapter 7 - AAA in the IMS

Authentication and authorization are generally linked in the IMS. In contrast, accounting is a separate function executed by different nodes. This was the reason why we decided to separate the description of authentication and authorization from the description of accounting. Section discusses authentication and authorization, and Section discusses accounting. | Chapter 7 AAA in the IMS Authentication and authorization are generally linked in the IMS. In contrast accounting is a separate function executed by different nodes. This was the reason why we decided to separate the description of authentication and authorization from the description of accounting. Section discusses authentication and authorization and Section discusses accounting. Authentication and Authorization in the IMS Figure shows the IMS architecture for performing authentication and authorization functions. There are three interfaces over which authentication and authorization actions are performed namely the Cx Dx and Sh interfaces . The Cx interface is specified between a Home Subscriber Server HSS and either an I-CSCF or an S-CSCF. When more than a single HSS is present in a home network there is a need for a Subscription Locator Function SLF to help the I-CSCF or S-CSCF to determine which HSS stores the data for a certain user. The Dx interface connects an I-CSCF or S-CSCF to an SLF running in Diameter redirect mode. The Sh interface is specified between an HSS and either a SIP Application Server or an OSA Service Capability Server for a complete description of the different types of Application Server in the IMS see Section . In all of these interfaces the protocol used between any two nodes is Diameter specified in RFC 3588 96 with an IMS-specific tailored application. Such a Diameter application defines new Diameter command codes and new Attribute-Value Pairs AVPs . The Cx and Dx Interfaces The Cx interface is specified between an I-CSCF and an HSS or between an S-CSCF and an HSS. Similarly the Dx interface is specified between an I-CSCF and an SLF or between an S-CSCF and an SLF. The only difference between these interfaces is that the SLF implements the functionality of a Diameter redirect agent whereas the HSS acts as a Diameter server. In either case both the I-CSCFs and S-CSCFs act as Diameter clients. In networks .

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