Cisco ASR 5000 series Product Overview page 535

PDN Gateway Overview
Important:
use license. For more information on ECS, refer to the Enhanced Charging Service Administration Guide.
Accept TCP Connections from DCCA Server
This feature allows for peer Diameter Credit Control Application servers to initiate a connection the NGME.
This feature allows peer diameter nodes to connect to the NGME on TCP port 3868 when the diameter server is
incapable of receiving diameter incoming diameter requests.
Important:
and for ECS configuration, refer to the Enhanced Charging Service Administration Guide.
Gy Interface Support
The Gy interface enables the wireless operator to implement a standardized interface for real time content based
charging with differentiated rates for time based and volume based charging.
As it is based on a quota mechanism, the Gy interface enables the wireless operator to spare expensive Prepaid System
resources.
As it enables time-, volume-, and event-based charging models, the Gy interface flexibly enables the operator to
implement charging models tailored to their service strategies.
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 of 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 plaintext TCP.
In the simplest possible installation, the system exchanges 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.
The Cisco implementation is based on the following standards:
RFC 4006 generic DCCA, including:
OL-22938-02
This functionality is available for use with the Enhanced Charging Service which requires a session-
For more information on Diameter support, refer to the AAA Interface Administration and Reference
CCR Initial, Update, and Final signaling
ASR and RAR asynchronous DCCA server messages
Time, Total-Octets, and Service-Specific-Units quota management
Multiple independent quotas using Multiple-Services-Credit-Control
Features and Functionality - Base Software ▀
Cisco ASR 5000 Series Product Overview ▄