Access-request (authentication) – Cisco Cisco Access Registrar 3.5 User Manual

Page 59

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6-5

Cisco Access Registrar 3.5 Concepts and Reference Guide

OL-2683-02

Chapter 6 Prepaid Billing Solution

Generic Call Flow

Note

In the following attribute tables, entries beginning with APPL indicate application-specific attributes.
Another application might use the field for different purpose or ignore the field. All the fields with APPL
are specific to Mobile Wireless usage for illustration purpose.

Access-Request (Authentication)

Flow 1c shows the client sending the Access-Request to AAA server, part of a normal authentication
request. The exact nature of the message contents is dictated by the access technology, be it be
CDMA1X-RTT, GPRS, or another. The Access-Request might involve other messages such as
PAP/CHAP or another form of authentication.

The Flow 1c Access-Request might contain a prepaid specific VSA, CRB_AUTH_REASON.

Table 6-2

lists the attributes included in the authentication Access-Request. This tells the Cisco AR 3.5 server to
authenticate the subscriber with the Prepaid server as well. If the value is
CRB_AR_INIT_AUTHENTICATE, the initial quota must be obtained for a single service prepaid
solution. If this VSA is not present, the Cisco AR 3.5 server will not authenticate with the Prepaid billing
server.

In Flow 1s, the Cisco AR 3.5 server sends a call to the billing server to authenticate the prepaid user and
possibly determine more information about the subscriber’s account. The Cisco AR 3.5 server can be
configured to generate this packet flow, using a subscriber profile parameter, if the request is from a
prepaid subscriber.

Table 6-2

Attributes Sent During Subscriber Authentication

Attribute
Number

Attribute Name

Description

Notes

1

User-Name

APPL: Mobile Node
Username

Required

2

NAS IP Address

Accounting Node IP
Address

APPL: Required, POA

31

Calling-station-ID

APPL:MSISDN or IMSI

APPL: Conditional

26, 9

CRB_AUTH_REASON
CRB_AR_INIT_AUTHENTICATE

Refer to VSA section

Required

26, 9

CRB_USER_ID

APPL:PDSN address or
SSG address

APPL: Required,
Address of the PDSN

26, 9

CRB_SERVICE_ID

APPL: Service ID such as
Simple IP service, Mobile
IP service, or VPN
service

26, 9

CRB_SESSION_ID

This VSA contains the
session key ID
information

Required; the session
ID must be globally
unique across all clients
and across reboots of
the client

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