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dsTest, Developing Solutions, Sy Interface, Charging Control, PCC Testing, PCRF Testing, OCS Testing

dsTest supports the Diameter Sy interface on both the (client) Policy Charging and Rules Function (PCRF) and the (server) Online Charging System (OCS) in 3GPP LTE networks. Determine the impact of the transfer of information relating to subscriber spending on your PCRF or OCS. The Sy Interface application can be used with our PCRF Emulator to test the functionality, capacity and performance of your OCS. Use the Sy Interface with our OCS Emulator to test the capability of your PCRF. Use both the PCRF Emulator and OCS Emulator with the Sy Interface Application to test Diameter Routing Agents (DRA), Proxies, Relay Agents, and Redirect Agents.

The Sy reference point is stateful, and is specified in 3GPP TS 29.219.


The Sy application implements the Spending Limits procedures specified in TS 29.219:

  • Requests for policy counter status;
  • Cancellation of policy counter changes;
  •  Notification of policy counter changes.

A complete set of events that can be generated with the Sy interface application can be found here, and our Diameter Dictionary can help you design, test, validate, and interpret the results of your Diameter testing.

As with all dsTest products, the node configurations and test scenarios are easily defined and configured with XML files that are validated against a published XML Schema to avoid invalid definitions. With our dsClient GUI, you can create, run, and archive tests, capture, graph and archive operational measurements, capture real-time data flows, and manage your dsTest servers and testing scenarios with a standalone application that runs on your PC.

PCRF Testing (Server Emulation)dsTest, Developing Solutions, Sy Interface, PCRF Testing, OCS Testing

Use the Sy Interface application and our OCS Emulator to test your PCRF client functionality. dsTest supports the Spending-Status-Notification-Request/Answer (SNR/SNA) message, allowing you to:

  • Report policy counter status values for a subscriber to your PCRF;
  • Report policy counter status changes to your PCRF.

OCS Testing (Client Simulation)

The Sy Interface application and our PCRF Emulator can test your OCS server functionality to determine the impact of the transfer of information relating to subscriber spending limits on the OCS. dsTest supports both Initial, Intermediate, and Final Spending-Limit-Requests/Answers (SLR/SLA) messages, allowing you to:dsTest, Developing Solutions, Sy Testing, GGSN Testing, PGW Testing, CSCF Testing

  • Initiate and terminate subscriptions for policy counter status to your OCS;
  • Request policy counter status from your OCS.

Advanced Testing Features

SmartEvents — Alter application behavior or coordinate multiple interface applications with SmartEvents. Our programmable, subscriber-level state machine gives you the ability to define handlers for specified application events that can then cause an event in another application to be executed. You can also configure handlers to modify subscriber information during run-time, introduce timers, or randomize subscriber behavior based on configurable probabilities to name a few of the many options in one of dsTest’s most powerful features.

SmartMessageElement — Insert, delete, or replace elements in Diameter, RADIUS, MAP, LDAP, GTP, REST, or SOAP messages with our SmartMessageElement solution. Define proprietary signaling or corrupt elements to facilitate negative testing. You can specify when your elements are used with SmartEvents.

Traffic Profile — Draw the shape of your test actions across time with Traffic Profile. You can define the rate for any action as a static rate or reference a Traffic Profile configuration, which also means that multiple Traffic Profiles can be running currently. Use Traffic Profile in conjunction with the randomizing features in SmartEvents to design a test that more truly simulates real-world network activity.

Diameter Dictionary — Define a set of message templates against which all messages will be validated with our Diameter Dictionary. Whether you’re load testing or testing functionality all messages are validated.

Operational Measurements

dsTest provides rich sets of measurements for the Sy interface:

  • Transaction and transport layer attempts, successes, and failures
  • Transaction duration, transactions-per-second, and round-trip delay
  • Message and byte counters
  • Errors encountered and error indications received in messages

See our Online Help for Sy measurements, Diameter measurements, and socket measurements.

You can read more about the reporting features offered with dsTest and dsClient here.

Supporting StandardsSy Stack