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 6-2lists 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.

Table 6-2 Attributes Sent During Subscriber Authentication

Attribute

 

 

 

Number

Attribute Name

Description

Notes

 

 

 

 

1

User-Name

APPL: Mobile Node

Required

 

 

Username

 

 

 

 

 

2

NAS IP Address

Accounting Node IP

APPL: Required, POA

 

 

Address

 

 

 

 

 

31

Calling-station-ID

APPL:MSISDN or IMSI

APPL: Conditional

 

 

 

 

26, 9

CRB_AUTH_REASON

Refer to VSA section

Required

 

CRB_AR_INIT_AUTHENTICATE

 

 

 

 

 

 

26, 9

CRB_USER_ID

APPL:PDSN address or

APPL: Required,

 

 

SSG address

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

Required; the session

 

 

session key ID

ID must be globally

 

 

information

unique across all clients

 

 

 

and across reboots of

 

 

 

the client

 

 

 

 

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.

Cisco Access Registrar 3.5 Concepts and Reference Guide

 

OL-2683-02

6-5

 

 

 

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Cisco Systems 3.5 manual Access-Request Authentication, Attribute Number Attribute Name Description

3.5 specifications

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