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6-6
Cisco Access Registrar 3.5 Concepts and Reference Guide
OL-2683-02
Chapter 6 Prepaid Billing Solution
Generic Call Flow
Access-Accept (Authentication)
Flow 2b shows the billing server returning the authentication result. The billing server returns a failure
if the prepaid subscriber has an inadequate balance.
Flow 2s shows the Cisco AR 3.5 server sending the Access-Accept to the AAA client. This message flow
contains at least one prepaid billing-specific VSA (listed in Table 6-3) and may contain other access
technology-specific attributes.
Access-Request (Authorization)
In Flow 3c, the AAA client sends another Access-Request, this time to authorize the subscriber.
Table 6-4 lists the attributes required by the Cisco AR 3.5 server to authorize the subscriber. The session
key ID used must be specified using a prepaid VSA pointing to the RADIUS attribute (standard or VSA).
.In Flow 3s, the Cisco AR 3.5 server sends the Prepaid billing server to obtain a quota. The quota might
contain several values depending on the number of measurement parameters chosen.
Access-Accept (Authorization)
Flow 4b shows the billing server returning the quota array for the subscriber.
Table 6-3 Attributes Sent to AAA client in Access-Accept (Authentication)
Attribute
Number Attribute Name Description Notes
26, 9 CRB__USER_TYPE
CRB_AR_INIT_AUTHENTICATE
Refer to Vendor-Specific
Attributes, page 6-10
Optional
Table 6-4 Attributes Sent During Subscriber Authorization
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_AUTHORIZE
Refer to Vendor-Specific
Attributes, page 6-10
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