Gx Interface Support
▀ Rel. 7 Gx Interface
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
296
Figure 28.
Rel. 7 Gx IMS Authorization Call Flow
Table 23.
Rel. 7 Gx IMS Authorization Call flow Description
Step
Description
1
UE (IMS subscriber) requests for primary PDP context activation/creation.
2
SessMgr allocates an IP address to the UE.
3
SessMgr requests IMS Authorization, if IMSA is enabled for the APN.
4
IMSA allocates resources for the IP CAN session and the bearer, and selects the PCRF to contact based on the user's
selection key (for example, msisdn).
5
IMSA requests the DPCA module to issue an auth request to the PCRF.