Enhanced Feature Support - Cisco ASR 5000 series Product Overview

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IP Services Gateway Overview

Enhanced Feature Support

This section describes the enhanced features supported by IPSG.

IMS Authorization Service

To support roaming IMS subscribers in a GPRS/UMTS network, the IPSG must be able to charge only for the amount

of resources consumed by the particular IMS application and bandwidth used. The IPSG must also allow for the

provisioning and control of the resources used by the IMS subscriber. To facilitate this, the IPSG supports the R7 Gx

interface to a Policy Control and Charging Rule Function (PCRF).

For detailed information on the Gx Interface support, refer to the Gx Interface Support chapter of the System Enhanced

Feature Configuration Guide.

Note the following for IPSG:

Only single bearer/session concept is supported. Multiple bearer concept is not applicable.

Only PCRF binding is applicable. PCEF binding is not applicable.

The following figure shows the interface and basic message flow of the Gx interface.

Figure 116. PSG Message/Data Flow (RADIUS Server Mode - IMS Auth Service)

IPSG also supports IMS Authorization Service Session Recovery with the following limitations:

Active calls only

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