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S6t Interface

dsTest supports both server emulation and client interface simulator capabilities for the 3GPP LTE S6t Diameter interface. Use the S6t Interface application on our Home Subscriber Server (HSS) Emulator to test the functionality, capacity, and performance of a Service Capabilities Exposure Function (SCEF). Use our SCEF simulator node with the S6t interface application to test your HSS. If you are testing CIoT/NB-IoT, dsTest can surround a CIoT Serving Gateway Node (C-SGN) with all the interfaces needed to verify the interface and functions required of the C-SGN.

The S6t reference point is stateless, and is specified in 3GPP TS 29.336.

Read more about our CIoT test solution.


The S6t application implements the following 3GPP procedures:

  • Configuration Information-Request/Answer
  • Reporting-Information-Request/Answer
  • Non IP Data Delivery(NIDD)-Information-Request/Answer

A complete set of events that can be generated with the S6t interface can be found here, and our Diameter Dictionary can be used to design, implement and analyze your S6t test scenarios.

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.

SCEF Testing (Server Emulation)

The HSS server emulator initiates the appropriate procedure when appropriate, eliminating the need to dedicate a production server to lab activities. You can manually trigger server-initiated procedures by executing a event chain with a run-time command or during an automated test.

Read more about our HSS Emulator.

HSS Testing (Client Simulation)

Our S6t Interface application simulates a SCEF S66 interface to determine the processing capacity and performance of a HSS. The S6t Interface application allows users to validate HSS performance and capacity in a realistic network environment, replicating the deployment configuration. Execute timed chains of test events with a run-time command or during an automated test to trigger SCEF-initiated procedures.

Multiple nodes can be instantiated on a single server, each with scalable subscriber loads and transaction rates. In this mode the S6t 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 S6t 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 S6t measurements, Diameter measurements, and socket measurements.

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

Supporting Standards