Gx Interface Support
Rel. 8 Gx Interface ▀
Cisco ASR 5x00 Packet Data Network Gateway Administration Guide ▄
313
Figure 31.
HA/PDSN Rel. 8 Gx IMS Authorization Call Flow
Table 25.
HA/PDSN Rel. 8 Gx IMS Authorization Call flow Description
Step
Description
1
UE (IMS subscriber) requests for MIP Registration Request.
2
SessMgr allocates an IP address to the UE.
3
SessMgr requests IMS Authorization, if IMSA is enabled for the subscriber.
IMSA service can either be configured in the subscriber template, or can be received from the AAA.
4
IMSA allocates resources for the IP-CAN session, and selects the PCRF to contact based on the user's selection key (for
example, round-robin).
5
IMSA requests the DPCA module to issue an auth request to the PCRF.