Cisco ASR 5000 Series - Page 199

ASN Gateway Overview
ASN Call Procedure Flows ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Figure 57. Call Flow Showing How Additional Quota is Obtained
PPS
(H-AAA)
ASN-GW
(PPC)
MS
Threshold Reached
1
4
3
IP Datagrams
Access-Request/PPAC
Threshold Reached
Quota Expiry
7
5
2
6
8
IP Datagrams
IP Datagrams
Access-Accept/PPAC
Access-Request/PPAC
Access-Accept/PPAC
Access-Accept
Access-Request/PPAC
Access-Accept/PPAC
Access-Request/PPAC
Table 41. Call Flow Showing How Additional Quota is Obtained
Step
Description
1
During network entry, a NAS sends an Access-Request packet to the HCSN. If the NAS supports a PPC, the NAS includes
the PPAC attributes, indicating it prepaid capabilities.
2
If the subscriber session is a prepaid session, the PPS (HAAA) assigns the initial prepaid quota(s) by including one or more
PPAQ attributes in the Access-Accept packet.
3
Once the threshold for the quota(s) is reached, the PPC sends an Authorize-Only Access-Request to request additional
quota. The request contains one or more PPAQs that indicate which quota(s) need to be replenished to the PPS.