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dsTest, Developing Solutions, Sh Interface, Dh Interface, HSS Testing, AS Testing, IMS Testing, VoLTE Testing

dsTest supports server emulation and client simulation capabilities for the 3GPP Diameter Sh and Dh interfaces. Test client Application Server (AS) Sh interfaces in LTE networks with our Home Subscriber Server (HSS) Emulator. Use the AS simulation in the Sh Interface application to test the capacity and performance of an HSS. Use the Dh Interface Application to test your Server Location Function (SLF).

Our Sh/Dh interface application, along with the comprehensive set of dsTest’s  EPC and IMS interface applications, such as  Rx, Cx/Dx, Ro/Gy, Rf/Gz,  and SIP interface signalling simulation between IP Multimedia Services (IMS) nodes, dsTest provides full featured end-to-end testing capabilities for 3G/4G/5G packet core networks, including IMS and Voice over LTE (VoLTE) testing.

Use the HSS Emulator and Sh Interface application in tandem to test Diameter Routing Agents (DRA), Proxies, Relay Agents, and Redirect Agents. dsTest provides additional tools for IMS  testing.


The Sh application implements the following procedures:

  • Data Read (Sh-Pull);
  • Data Update (Sh-Update);
  • Subscription to Notifications (Sh-Subs-Notify);
  • Notifications (Sh-Notif) with optional Notif-Eff support.

A full set of the events that can be configured by the Sh Interface Application can be found here.

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.

IMS Application Server (AS) Testing (Server Emulation)dsTest, Developing Solutions, Sh Interface, Dh Interface, HSS Testing, AS Testing, IMS Testing

The HSS Emulator provides Mobile Subscriber data repository services for the Sh interface, including transparent and non-transparent data—all of the functionality required by an AS. The HSS emulator executes procedures based on configurable subscriber profiles, responding to requests from AS servers and eliminating the need to dedicate a production server to lab activities. You can modify subscriber transparent and non-transparent data during run-time and execute a test event chain with a run-time command or during an automated test to initiate an Sh-Notif procedure.

Multiple HSS Emulators can be instantiated on a single server. In this mode each emulator can support multiple interfaces, up to an aggregate of 1000 client connections across all emulators. The emulators are fully independent and their subscriber databases may be independent, overlap, or be duplicated.

Read more about our HSS Emulator.

HSS Testing (Client Simulation)dsTest, Developing Solutions, Sh Interface, Dh Interface, HSS Testing, AS Testing, IMS Testing

The Sh Interface application can be used to simulate AS functionality to determine the impact of HSS features and standards before they are deployed in a network. The Sh Interface application allows you 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 AS-initiated procedures.

  • Request user data;
  • Update user data;
  • Subscribe or unsubscribe to notifications and optionally include the send data indication in new subscription requests.

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

SLF Testing

The Sh/Dh Interface application can be used as a AS simulator to test the performance and capacity of your Server Location Function (SLF) before it is deployed in your network.

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 Sh/Dh 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 Sh measurements, Diameter measurements, and socket measurements.

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

Supporting StandardsdsTest, Sh Interface, Dh Interface, SLF, IMS Testing, HSS Testing, EPC Testing, LTE Testing