Diameter Accounting And Credit Control; Gx Interface Support; Gy Interface Support - Cisco ASR 5000 Series Administration Manual

▀ Accounting and Charging Interfaces
 On-line Service Accounting (Prepaid)—ECS reports service usage to the AAA server. The AAA server acts as
a prepaid control point and the ECS as the client. Accounting can be applied to a full prepaid implementation
or just to keep ECS updated of the balance level and trigger a redirection if the subscriber balance reaches a
low level.

Diameter Accounting and Credit Control

The Diameter Credit Control Application (DCCA) is used to implement real-time online or offline charging and credit
control for a variety of services, such as network access, messaging services, and download services.
In addition to being a general solution for real-time cost and credit control, DCCA includes these features:
 Real-time Rate Service Information—DCCA can verify when end subscribers' accounts are exhausted or
expired; or deny additional chargeable events.
 Support for Multiple Services: DCCA supports the usage of multiple services within one subscriber session.
Multiple service support includes:
 The ability to identify and process the service or group of services that are subject to different cost
 Independent credit control of multiple services in a single credit control sub-session.

Gx Interface Support

The Gx interface is used in IMS deployment in GPRS/UMTS networks. Gx interface support on the system enables
wireless operators to intelligently charge the services accessed depending on the service type and parameters with rules.
It also provides support for IP Multimedia Subsystem (IMS) authorization in a GGSN service. The goal of the Gx
interface is to provide network-based QoS control as well as dynamic charging rules on a per bearer basis for an
individual subscriber. The Gx interface is in particular needed to control and charge multimedia applications.
Important:
administration guide for the product that you are deploying.

Gy Interface Support

The Gy interface provides a standardized Diameter interface for real-time content-based charging of data services. It is
based on the 3GPP standards and relies on quota allocation.
It provides an online charging interface that works with the ECS Deep Packet Inspection feature. With Gy, customer
traffic can be gated and billed in an "online" or "prepaid" style. Both time- and volume-based charging models are
supported. In all these models, differentiated rates can be applied to different services based on shallow or deep-packet
inspection.
Gy is a Diameter interface. As such, it is implemented atop, and inherits features from, the Diameter Base Protocol. The
system supports the applicable base network and application features, including directly connected, relayed or proxied
DCCA servers using TLS or plain text TCP.
In the simplest possible installation, the system will exchange Gy Diameter messages over Diameter TCP links between
itself and one "prepay" server. For a more robust installation, multiple servers would be used. These servers may
optionally share or mirror a single quota database so as to support Gy session failover from one server to the other. For a
more scalable installation, a layer of proxies or other Diameter agents can be introduced to provide features such as
multi-path message routing or message and session redirection features.
▄ Cisco ASR 5x00 Enhanced Charging Services Administration Guide
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structures.
For more information on Gx interface support, see the Gx Interface Support appendix in the
Enhanced Charging Service Overview