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About this guide

This document details the Diameter Gy interface specification. The Diameter Gy application is also referred to as Diameter Credit Control Application (DCCA).

The tables in this document provide Attribute Value Pair (AVP) details organized per message type.

The SR OS also provides a Diameter Python interface that enables flexible insertion, deletion, and formatting of AVPs received from and sent to a Diameter application server. For more information about the Diameter Python API, see the 7450 ESS, 7750 SR, and VSR Triple Play Service Delivery Architecture Guide.


Unless otherwise indicated, CLI commands, contexts, and configuration examples in this guide apply for both the classic CLI and the MD-CLI.


This document is intended for network administrators who are responsible for configuring and operating 7750 SR and VSR service routers and using Diameter applications. It is assumed that the network administrators have an understanding of networking principles and configurations, routing processes, protocols, and standards.


RFC 2865, ‟Remote Authentication Dial In User Service (RADIUS)”, June 2000

RFC 4006, ‟Diameter Credit-Control Application”, August 2005

RFC 6733, ‟Diameter Base Protocol”, October 2012

3GPP TS 32.299 v9.4.0, ‟Diameter charging applications”, June 2010

7450 ESS, 7750 SR, and VSR RADIUS Attributes Reference Guide