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S6m/S6n Interface Application

dsTest supports both server emulation and client interface simulator capabilities for the 3GPP LTE S6m/S6n Diameter interface. Use the S6m/S6n Interface application on our simulated Machine Type Communications Interworking Function (MTC-IWF) or MTC-AAA to test the capacity and performance of a Home Subscriber Server (HSS). Use our HSS simulator node with the S6m/S6n interface application to test your MTC-AAA or MTC-IWF/CIoT Device Management Gateway. If you are testing CIoT/NB-IoT, dsTest can surround a device management gateway with all the interfaces needed to verify the SCEF, MTC-IWF and SCS functions required of the Device Management Gateway.

The S6m and S6n reference points are stateless, and are specified in 3GPP TS 29.336.

Read more about our CIoT test solution.


The S6m/S6n application implements the following 3GPP procedures:

  • Subscriber Information Request/Answer

A complete set of events that can be generated with the S6m/S6n interface can be found here, and our Diameter Dictionary can be used to help 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.

MTC-AAA/MTC-IWF Testing (Server Emulation)

Our HSS server emulator supplies an appropriate response when applicable, eliminating the need to dedicate a production server to lab activities. The S6m/S6n application allows users to validate MTC-IWF/MTC-AAA functionality, performance and capacity in a realistic network environment, replicating a deployment configuration.

Read more about our HSS Emulator.

HSS Testing (Client Simulation)

The S6m/S6n application simulates a MTC-IWF/MTC-AAA S6m/S6n interface to your HSS to determine the functionality, processing capacity and performance of the HSS. Execute timed chains of test events with a run-time command or during an automated test to trigger procedures initiated by the MTC-IWF/MTC-AAA procedures.

Multiple nodes can be instantiated on a single server, each with scalable subscriber loads and transaction rates. In this mode the S6m/S6n interfaces of up to 1000 independent client nodes may be simultaneously simulated. The nodes are fully independent and their subscriber configurations may also be independent, overlap, or be duplicated.

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 concurrently. 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 S6m and S6n interfaces:

  • 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 S6m measurements, S6n measurements, Diameter measurements, and socket measurements.

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

Supporting Standards